You searched for subject:( Thermal Hydraulic).
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Penn State University
1.
Karriem, Veronica.
PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
.
Degree: 2011, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/11843 
► The Penn State Breazeale Reactor (PSBR) is in the process of changing the core-moderator assembly of the reactor requiring a complete safety evaluation. In this…
(more)
▼ The Penn State Breazeale Reactor (PSBR) is in the process of changing the core-moderator assembly of the reactor requiring a complete safety evaluation. In this study, the core
thermal-hydraulics aspects of the envisioned modifications were investigated. In particular, the D2O tank will be redesigned to such an extent, that concerns were raised about the cooling of the core with the new D2O moderator tank.
The first task was to establish a
thermal hydraulic model of the current PSBR core. This model was designed using the
thermal hydraulic code COBRA-TF (CTF). The CTF predictions of the hot channel coolant temperature and the hot rod maximum fuel temperature were compared against recent experimental data. The developed CTF model of the new PSBR core was utilized for design studies. A feasibility study was performed to investigate the coolant flow patterns through the core for a possible power upgrade for the reactor.
Our results for the
thermal hydraulic model of the current PSBR core have shown good agreement with the measured data. The results of flow patterns of the coolant through the core are as anticipated for the new design core-D2O moderator tank. These studies are part of an ongoing project aiming to determine the safety of the new PSBR core loading.
In addition to these studies, the reactor core was analyzed for an addition of a new fuel type. The result of this analysis showed that the new fuel is more reactive than the current standard TRIGA fuel currently in the core and further core design studies are required.
Advisors/Committee Members: Maria Nikolova Avramova, Thesis Advisor/Co-Advisor, Maria Nikolova Avramova, Thesis Advisor/Co-Advisor.
Subjects/Keywords: thermal hydraulic; PSBR
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APA (6th Edition):
Karriem, V. (2011). PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11843
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karriem, Veronica. “PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
.” 2011. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/11843.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karriem, Veronica. “PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
.” 2011. Web. 17 Jan 2021.
Vancouver:
Karriem V. PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/11843.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karriem V. PSBR CORE DESIGN STUDIES OF THE D2O TANK DESIGN
AND NEW LEU FUEL UTILIZATION
. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11843
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
2.
Vermaak, Rynhardt Petrus.
Thermal and hydraulic modeling of an anaerobic digestion plant.
Degree: MEng, Mechanical and Mechatronic Engineering, 2016, Stellenbosch University
URL: http://hdl.handle.net/10019.1/98816
► ENGLISH ABSTRACT: The use of an anaerobic digestion (AD) process to treat municipal sewage sludge is one of the few options that provides the ability…
(more)
▼ ENGLISH ABSTRACT: The use of an anaerobic digestion (AD) process to treat municipal sewage sludge is one of the few options that provides the ability to treat sludge, offers a sustainable option for a carbon-neutral energy source and ability to reclaim wastewater back to potable water. The importance of the anaerobic digestion plant layout is investigated in terms of its process capacity, energy production and electrical energy generation based on thermal numerical modelling.
A design is proposed in the study that is able to treat 986.742 m3/day at 4%TS (81 %) of the available sludge at the wastewater treatment plant, generating 1.293 MW net electrical power and still meet the heat requirements of the anaerobic digestion plant as well as the quality of effluent discharged by the plant. The proposed design is able to treat 53 % more sludge and generate 45.4 % more electrical net power compared to the first conceptual plant layout using a 3/2 two-stage digester configuration.
With the use of hydraulic numerical modelling and experimental work, a mixing system was developed and proposed, that satisfies the biological requirement of micro bacteria inside the digester. The benefits of selecting the proposed mixing system over the mechanical draft tube method include: all the mechanical equipment of the mixing system is located outside the digester, it has no moving parts inside the digester, tedious downtime of clogged rotating equipment is eliminated and a reduction in biogas production rate when the digester is opened and exposed to air for maintenance can be eliminated.
The proposed mixing system consists of five 518 mm draft tubes using a two-phase plug-flow regime formed by five plug-flow generators placed at the bottom of the draft tubes. The mixing system proposed was able to achieve a digester volume turn over time (DVTT) from 0.82 to 1.3 h, at a mixing intensity (G) from 70.58 to 35.88 s-1 requiring a unit power per volume (UP) from 3.41 to 0.88 W/m3.
Stellenbosch University https://scholar.sun.ac.za
AFRKAANSE OPSOMMING: Anaërobiese verteer (AV)-prosesse is een van min behandelingsmetodes wat gebruik kan word om munisipale rioolslyk te behandel en bied, ’n volhoubare moontlikheid van ’n koolstofneutrale energiebron, en die vermoë inhou om afvalwater tot drinkbare water te suiwer. Die belangrikheid van die AV-aanlegontwerp is ondersoek aan die hand van werkverrigting in die stabilisering van slyk hoeveelheid sowel as, elektriese en energieproduksie wat gebaseer was op grond van ’n termiese numeriese model.
Die voorgestelde ontwerp van die gevallestudie kon daarin slaag om 986.742 m3/dag teen 4%TS (81 %) van die beskikbare slyk by die afvalwatersuiweringsaanleg te behandel, 1.293 MW netto elektriese krag opwek en steeds aan die hitte vereiste van die aanleg voldoen asook die kwaliteit van wat afgevoer water deur die aanleg. Die voorgestelde ontwerp kon 53% meet slyk hanteer en kon 45.4 % meer elektriese genereer vergeleke met die eerste voorgestelde ontwerp wat gebruik maak van n 3/2 twee-fase…
Advisors/Committee Members: Dobson, Robert Thomas, Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..
Subjects/Keywords: Anaerobic digestion; Thermal; Hydraulic models; UCTD
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APA (6th Edition):
Vermaak, R. P. (2016). Thermal and hydraulic modeling of an anaerobic digestion plant. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/98816
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vermaak, Rynhardt Petrus. “Thermal and hydraulic modeling of an anaerobic digestion plant.” 2016. Thesis, Stellenbosch University. Accessed January 17, 2021.
http://hdl.handle.net/10019.1/98816.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vermaak, Rynhardt Petrus. “Thermal and hydraulic modeling of an anaerobic digestion plant.” 2016. Web. 17 Jan 2021.
Vancouver:
Vermaak RP. Thermal and hydraulic modeling of an anaerobic digestion plant. [Internet] [Thesis]. Stellenbosch University; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10019.1/98816.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vermaak RP. Thermal and hydraulic modeling of an anaerobic digestion plant. [Thesis]. Stellenbosch University; 2016. Available from: http://hdl.handle.net/10019.1/98816
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Ozotta, Ogochukwu.
Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.
Degree: MS, Geological Engineering, 2018, University of North Dakota
URL: https://commons.und.edu/theses/2424
► Groundwater flow and its dissolved mineral transport plays a fundamental role in the ecology of many wetlands. Installation of equipment to map groundwater seepage,…
(more)
▼ Groundwater flow and its dissolved mineral transport plays a fundamental role in the ecology of many wetlands. Installation of equipment to map groundwater seepage, however, is invasive and may damage vegetation and potentially affect biodiversity. By mapping surface temperature remotely in the late summer, when the differential between warm soil and cold groundwater is the greatest, the temperature patterns may reveal areas of greatest upward gradient and flow.
To test the hypothesis, the effect that
hydraulic gradient has on surface temperature in a fen located at the north end of the Cherry Lake Aquifer, Eddy County, ND (47.73, -98.66) was monitored and measured.
Thermal imaging was used to characterize groundwater seepage, the results were compared to conventional method of installing shallow ceramic cup tensiometers to measure
hydraulic gradient, and estimate flux using Darcy’s law. Shallow temperature loggers were installed to characterize soil temperature at the same sites. The approach was applied at contrasting two locations: a sedge-cattail covered site (Sedge) and a nearby site with cordgrass and closed-canopy shrubs and trees (Willow).
Both sites showed variable
hydraulic gradients between the shallow and deep tensiometer, perhaps related to variation in transpiration. The temperature trend determined from the
thermal imaging showed a closer relationship to
hydraulic gradients measured at the Sedge site more than at the Willow site. The
hydraulic conductivity, K ranged from 6 × 10-6 to 2 × 10-4 m/s for both sites, which falls within values typical for fen sediments. The flux calculated for the Willow site ranged from 1.4 × 10-5 to 1.1 × 10-4 m/s and that of the Sedge site ranged from 4.5 × 10-6 to 1.1 × 10-5 m/s. Willow site
thermal imaging did not show similar trend with the
hydraulic gradient, suggesting tree cover can affect
thermal signature at the surface. Temperature profile observations from the
thermal aerial imagery and the FLIR C2 camera showed a similar trend.
Both forward and inverse modeling of temperature profiles, which is based on a one-dimensional solution to the advection-conduction equation (Kurylyk et al. 2017), were used to more thoroughly characterize the shallow variation of flux compared to
thermal imaging, coupled with additional field data on temperature distribution,
thermal conductivity, depth, and layer thickness. Accounting for soil layer properties plays a role in characterizing groundwater seepage direction and rate.
The gradients are affected at some depth because of the varying soil stratigraphy, which explains the reason why the seepage faces cannot be mapped completely using
thermal imaging at these sites.
Advisors/Committee Members: Philip J. Gerla.
Subjects/Keywords: Fen; Groundwater-surface water; Hydraulic conductivity; Hydraulic gradient; Seepage; Thermal imaging
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APA ·
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Manager
APA (6th Edition):
Ozotta, O. (2018). Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/2424
Chicago Manual of Style (16th Edition):
Ozotta, Ogochukwu. “Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.” 2018. Masters Thesis, University of North Dakota. Accessed January 17, 2021.
https://commons.und.edu/theses/2424.
MLA Handbook (7th Edition):
Ozotta, Ogochukwu. “Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.” 2018. Web. 17 Jan 2021.
Vancouver:
Ozotta O. Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. [Internet] [Masters thesis]. University of North Dakota; 2018. [cited 2021 Jan 17].
Available from: https://commons.und.edu/theses/2424.
Council of Science Editors:
Ozotta O. Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. [Masters Thesis]. University of North Dakota; 2018. Available from: https://commons.und.edu/theses/2424
Penn State University
4.
Bennett, Alexander Sedgwick.
Development and Testing of a Coupled MCNP6/CTF Code.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/27383
► Current core design methodologies rely on the use of determinstic codes that can run core calculations fast and accuratly. When these deterministic codes are applied…
(more)
▼ Current core design methodologies rely on the use of determinstic codes that can run core calculations fast and accuratly. When these deterministic codes are applied to new reactors, they need reference solutions to verify that their results are still accurate. Typically, reference solutions can be obtained from either experimental results or high fidelty codes. To get detailed experimental reactor core results at both pin level and full power is difficult and expensive. Instead, there has been an increasing trend towards high fidelity codes. These high fidelity codes need to be verified and validated.
This thesis presents the development and testing of a high fidelity Monte Carlo based multi-physics code. The coupling was done between a Monte Carlo Neutronics code and a
thermal-
hydraulic sub-channel code. The Monte Carlo Neutronics code that was chosen is MCNP6, which is a general purpose transport code that has exact geometry modeling and uses continuous energy cross sections. The
thermal-
hydraulic sub-channel code that was chosen is CTF, which can calculate the temperature and density distributions in the coolant and the temperature distribution in the fuel and cladding. The coupling was performed at a pin level.
The coupled MCNP6/CTF code was coupled using an internal coupling technique. On-The-Fly cross sections were used to decrease the complexity of the coupled code as well as to decrease the memory requirement. The relaxation acceleration technique was applied to the coupled code and was shown that it could obtain much stricter convergence criterions. The technique can also guarantee convergence and be used as a tool to decrease the computational time.
The coupled code was tested against two other coupled Monte Carlo/
Thermal-
Hydraulic sub-channel codes and the results were similar. The coupled code was also tested on a full assembly level problem. The assembly level problem had experimental data at hot zero power (HZP). The comparison of the coupled code results with the experimental data showed good agreement, keeping in mind that the coupled code did not model all the experimental details.
Advisors/Committee Members: Kostadin Nikolov Ivanov, Thesis Advisor/Co-Advisor, Maria Nikolova Avramova, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Monte Carlo Neutronics; Thermal Hydraulic Subchannel; Coupling; MCNP6; CTF
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APA (6th Edition):
Bennett, A. S. (2015). Development and Testing of a Coupled MCNP6/CTF Code. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27383
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bennett, Alexander Sedgwick. “Development and Testing of a Coupled MCNP6/CTF Code.” 2015. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/27383.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bennett, Alexander Sedgwick. “Development and Testing of a Coupled MCNP6/CTF Code.” 2015. Web. 17 Jan 2021.
Vancouver:
Bennett AS. Development and Testing of a Coupled MCNP6/CTF Code. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/27383.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bennett AS. Development and Testing of a Coupled MCNP6/CTF Code. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27383
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
5.
Cao, Kaiyu.
Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage.
Degree: MS, Chemical Engineering, 2019, Texas A&M University
URL: http://hdl.handle.net/1969.1/188713
► As water issues associated with hydraulic fracturing have received much attention, several optimization approaches have been developed for effective water management. However, most of them…
(more)
▼ As water issues associated with
hydraulic fracturing have received much attention, several optimization approaches have been developed for effective water management. However, most of them have not considered pumping schedules for
hydraulic fracturing, which determine the productivity of a shale well as well as the total amount of freshwater required. Motivated by this consideration, a novel model-based control framework is proposed for
hydraulic fracturing to maximize the net profit from shale gas development which simultaneously minimizes the total cost associated with water management. The framework is as follows; initially a reduced-order model and a Kalman filter are developed based on the simulation data generated from a high-fidelity
hydraulic fracturing model to correlate the pumping schedule and the final fracture geometry. Then, a numerical reservoir simulator and mixed-integer nonlinear programming model are used to generate two maps describing the revenue from selling shale gas produced and cost from managing wastewater recovered, respectively.
Finally, by applying a data-based dynamic input-output model to connect the two maps, a model predictive control system is formulated. The proposed control framework enables 62% of the generated wastewater to be reused through the application of
thermal membrane distillation technology in treatment process and results in a 11% reduction in overall freshwater consumption, while maintaining the productivity of shale wells at its theoretical maximum.
Advisors/Committee Members: Kwon, Joseph (advisor), EI-Halwagi, Mahmoud (committee member), Wu, Kan (committee member).
Subjects/Keywords: hydraulic fracturing; water management; thermal membrane distillation; model predictive control; MINLP
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APA ·
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APA (6th Edition):
Cao, K. (2019). Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188713
Chicago Manual of Style (16th Edition):
Cao, Kaiyu. “Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage.” 2019. Masters Thesis, Texas A&M University. Accessed January 17, 2021.
http://hdl.handle.net/1969.1/188713.
MLA Handbook (7th Edition):
Cao, Kaiyu. “Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage.” 2019. Web. 17 Jan 2021.
Vancouver:
Cao K. Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1969.1/188713.
Council of Science Editors:
Cao K. Economic Model-Based Controller Design Framework for Hydraulic Fracturing to Optimize Shale Gas Production and Water Usage. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/188713
Univerzitet u Beogradu
6.
Milivojević, Sanja S., 1979-.
Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama.
Degree: Mašinski fakultet, 2015, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:9253/bdef:Content/get
► Mašinstvo-Termoenergetika / Mechanical engineering-Thermal power engineering
U okviru doktorske disertacije je razvijen numeriĉki postupak za proraĉun prostiranja temperaturskih talasa i razdelne površine izmeĊu stuba teĉnosti…
(more)
▼ Mašinstvo-Termoenergetika / Mechanical
engineering-Thermal power engineering
U okviru doktorske disertacije je razvijen
numeriĉki postupak za proraĉun prostiranja temperaturskih talasa i
razdelne površine izmeĊu stuba teĉnosti i parne faze u cevovodima i
sloţenim cevnim mreţama. Postupak je zasnovan na rešavanju
energijske jednaĉine jednodimenzionalnog strujanja homogenog
fluida. Energijska jednaĉina se rešava numeriĉki duţ
karakteristiĉnog pravca odreĊenog kretanjem fluidnog delića u
vremensko-prostornom koordinatnom sistemu. Postupak numeriĉkog
rešavanja je eksplicitan i vremenski korak integracije je odreĊen
minimalnim vremenom potrebnim da fluidni delić preĊe rastojanje od
poĉetnog poloţaja, koji se u opštem sluĉaju nalazi izmeĊu ĉvorova
mreţe, do najbliţeg susednog numeriĉkog ĉvora u pravcu strujanja, u
okviru cele mreţe (Courant-ov kriterijum). Primenom Lagrange-ovog
interpolacionog polinoma se odreĊuje vrednost temperature ili
entalpije u poĉetnom vremenskom trenutku izmeĊu ĉvorova numeriĉke
mreţe, na karakteristici koja predstavlja pravac prostiranja
fluidnog delića. Razvijene su bilansne jednaĉine koje omogućuju
proraĉun graniĉnih uslova, kao što su spoj tri ili više cevi u
ĉvoru, toplotnorazmenjivaĉke podstanice kod potrošaĉa i u izvoru
toplote. Razvijena metoda je primenjena na simulaciju prelaznog
procesa u okviru sistema daljinskog grejanja toplane Zemun nastalog
usled promene snage izvora toplote. Razvijeni numeriĉki postupak je
primenjen i za simulaciju i analizu hidrauliĉkog udara izazvanog
kondenzacijom pare. Neposredni kontakt pothlaĊene teĉnosti i pare u
stanju zasićenja dovodi do intenzivne kondenzacije. Brzina
kondenzacije zavisi od specifiĉne razdelne površine teĉne i parne
faze i koeficijenta prelaza toplote usled kondenzacije. Razdelna
površina teĉnosti i pare ima veoma nepravilan oblik. Za vreme
hidrauliĉkog udara izazvanog kondenzacijom pare nestacionarni
mlazevi teĉnosti i kapi se odvajaju sa ĉela stuba teĉnosti i
ukljuĉuju se u zapreminu pare. Ova pojava ukljuĉivanja znaĉajno
povećava razdelnu površinu i brzinu kondenzacije. U cilju
predviĊanja brzine kondenzacije u ovakvim sloţenim uslovima,
razvijena je korelacija izmeĊu ubrzanja ĉela vodenog stuba i
proizvoda specifiĉne razdelne površine teĉne i iv parne faze i
koeficijenta prelaza toplote pri kondenzaciji...
Advisors/Committee Members: Stevanović, Vladimir, 1960-.
Subjects/Keywords: thermal hydraulic transient; temperature wave; method
of characteristics; water hammer; condensation
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APA ·
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APA (6th Edition):
Milivojević, Sanja S., 1. (2015). Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:9253/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Milivojević, Sanja S., 1979-. “Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama.” 2015. Thesis, Univerzitet u Beogradu. Accessed January 17, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:9253/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Milivojević, Sanja S., 1979-. “Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama.” 2015. Web. 17 Jan 2021.
Vancouver:
Milivojević, Sanja S. 1. Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama. [Internet] [Thesis]. Univerzitet u Beogradu; 2015. [cited 2021 Jan 17].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9253/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Milivojević, Sanja S. 1. Numerička simulacija prostiranja temperaturskih talasa
pri strujanju nosioca toplote u složenim cevnim mrežama. [Thesis]. Univerzitet u Beogradu; 2015. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9253/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidad de Navarra
7.
[No author].
Thermal and hydraulic design of water-based cooling systems for electrical machines.
Degree: 2018, Universidad de Navarra
URL: http://hdl.handle.net/10171/55401
► Thermal management of electrical machines is gaining more and more attention from the research and industrial community, due to the demanding power density and reliability…
(more)
▼ Thermal management of electrical machines is gaining more and more attention from the research and industrial community, due to the demanding power density and reliability conditions of present and future applications.
The aim of this research work is to draw some conclusions about which is the best way of designing and optimizing two types of cooling systems for electrical machines. More precisely, the cooling systems studied use water as a secondary coolant, and are classified by IEC60034 as IC71W and IC81W. These systems are very popular in traction and marine applications.
For this purpose, both algebraic and CFD based models have been developed in order to precisely calculate the behavior of the main components of these cooling systems. Once these models have been validated experimentally, they have been employed to derive design and optimization criteria for the systems.
Thus, as a first step, the main considerations for the development of an algebraic
thermal model for the IC71W cooling system are examined. A detailed classification of the most critical convective correlations and a review of the modelling of the water jacket is given. Once the model is described, the solving procedure and its experimental validation is exposed.
Secondly, using the previously validated model a complete design methodology for the water jacket of an IC71W cooling system is proposed. Different elements such as the shaft or the housing are analyzed in order to obtain some criteria for their design. The inclusion of wafters in this kind of cooling systems is examined, proposing an optimum configuration and evaluating the effect of this element on the temperatures of the stator end-windings.
Regarding the IC81W cooling system, the same process has been followed. As a first step, both a
hydraulic and a
thermal model have been developed. The
hydraulic model is defined in more detail, because it is crucial to obtain a realistic behavior of airflow inside the machine. After that, a method for the computation and solving of these models and its experimental validation process is presented.
Finally, with the developed models, the main elements defining an IC81W cooling system (which is very extended for marine applications), the fan and the primary circuit, are studied. A design methodology for the fan fixed to the shaft is proposed, including the effect of the main parameters defining this element on the airflow and the pressure rise. Furthermore, different elements in the primary circuit are studied, obtaining the
thermal behavior of different configurations and determining the best choice in order to reduce temperatures in the active parts of the machine.
Advisors/Committee Members: Martinez Esnaola, J.M.(José Manuel) (advisor), Ramos-González, J. (Juan Carlos) (advisor).
Subjects/Keywords: Thermal design.;
CFD;
DoE;
Electric machines.;
Water-cooled.;
Hydraulic design.
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APA (6th Edition):
author], [. (2018). Thermal and hydraulic design of water-based cooling systems for electrical machines.
(Thesis). Universidad de Navarra. Retrieved from http://hdl.handle.net/10171/55401
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
author], [No. “Thermal and hydraulic design of water-based cooling systems for electrical machines.
” 2018. Thesis, Universidad de Navarra. Accessed January 17, 2021.
http://hdl.handle.net/10171/55401.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
author], [No. “Thermal and hydraulic design of water-based cooling systems for electrical machines.
” 2018. Web. 17 Jan 2021.
Vancouver:
author] [. Thermal and hydraulic design of water-based cooling systems for electrical machines.
[Internet] [Thesis]. Universidad de Navarra; 2018. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10171/55401.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. Thermal and hydraulic design of water-based cooling systems for electrical machines.
[Thesis]. Universidad de Navarra; 2018. Available from: http://hdl.handle.net/10171/55401
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
8.
Frick, Peyton.
A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems.
Degree: MS, Mechanical Engineering, 2007, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/191
► The performance of automotive cooling systems can be improved by replacing the traditional mechanically driven radiator fan and water pump assemblies with computer controlled components.…
(more)
▼ The performance of automotive cooling systems can be improved by replacing the traditional mechanically driven radiator fan and water pump assemblies with computer controlled components. The introduction of electric servo-motors to drive the cooling components can improve temperature tracking, which should increase fuel efficiency and decrease tailpipe emissions. However, the power requirement for these electric motors increases with greater cooling demands if the radiator surface area remains constrained. For heavy-duty applications, where engines are subjected to significant cooling loads, electric motors may become impractical due to their increased size and power requirements; in these situations,
hydraulic-based components are advantageous due to their high power density. The off-road equipment industry currently uses
hydraulic radiator fan drives for cooling applications, while the coolant pump remains mechanically driven. Therefore, an opportunity exists to integrate the radiator fan and coolant pump into
hydraulic circuits to actively meet cooling demands. In this research project, an automotive
thermal management system, which features a computer controlled hydraulically actuated fan and coolant pump, was investigated. A series of analytical mathematical models were derived for the
hydraulic and
thermal system components. An experimental test bench was constructed, which implements a
hydraulic based radiator fan and water pump, as well as electric immersion heaters to simulate the heat of engine combustion. The test bench was used to validate the mathematical models and study the proposed cooling system's ability to regulate engine temperature. Classical control methods have been applied to control the coolant temperatures by integrating the temperature, shaft speed, and
hydraulic pressure feedback information. Further, the performance of two types of
hydraulic flow control valves has been studied to offer design engineers insight into actuator behavior. The dynamic
hydraulic and
thermal system models displayed good correlation with data obtained from the experimental test bench (steady-state errors below 1.6%). Additionally, the experimental system demonstrated excellent temperature tracking results (maximum 0.20¡K steady-state set point deviation) when using servo-solenoid valves to control the speed of the
hydraulic motor driven radiator fan and water pump. However, when using the more cost effective solenoid poppet valves, the system exhibited limited temperature tracking abilities (maximum 2.48¡K steady-state set point deviation). Still, each valve displayed minimal power usage (by the pump and fan motors) with the servo valves consuming on average 58-160 Watts and the poppet valves consuming on average 66-128 Watts. The
hydraulic actuated
thermal management system has the ability to effectively regulate engine temperatures while offering the potential for power minimization to increase fuel efficiency and reduce emissions. Despite their higher cost, servo-solenoid…
Advisors/Committee Members: Wagner, John R, Mears , Laine, Dawson , Darren M.
Subjects/Keywords: Hydraulic Thermal Management; Engineering Mechanics
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APA (6th Edition):
Frick, P. (2007). A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/191
Chicago Manual of Style (16th Edition):
Frick, Peyton. “A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems.” 2007. Masters Thesis, Clemson University. Accessed January 17, 2021.
https://tigerprints.clemson.edu/all_theses/191.
MLA Handbook (7th Edition):
Frick, Peyton. “A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems.” 2007. Web. 17 Jan 2021.
Vancouver:
Frick P. A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems. [Internet] [Masters thesis]. Clemson University; 2007. [cited 2021 Jan 17].
Available from: https://tigerprints.clemson.edu/all_theses/191.
Council of Science Editors:
Frick P. A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems. [Masters Thesis]. Clemson University; 2007. Available from: https://tigerprints.clemson.edu/all_theses/191
Virginia Tech
9.
Zhang, Mingyang.
Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography.
Degree: MS, Mechanical Engineering, 2018, Virginia Tech
URL: http://hdl.handle.net/10919/81859
► In order to protect gas turbine blades from hot gases exiting the combustor, several intricate external and internal cooling concepts are employed. High pressure stage…
(more)
▼ In order to protect gas turbine blades from hot gases exiting the combustor, several intricate external and internal cooling concepts are employed. High pressure stage gas turbine blades feature serpentine passages where rib turbulators are installed to enhance heat transfer between the relatively colder air bled off from the compressor and the hot internal walls. Most of the prior studies have been restricted to Reynolds number of 90000 and several studies have been carried out to determine geometrically optimized parameters for achieving high levels of heat transfer in this range of Reynolds number. However, for land-based power generation gas turbines, the Reynolds numbers are significantly high and vary between 105 and 106. Present study is targeted towards these high Reynolds numbers where traditional rib turbulator shapes and prescribed optimum geometrical parameters have been investigated experimentally. A steady-state liquid crystal thermography technique is employed for measurement of detailed heat transfer coefficient. Five different rib configurations, viz., 45 deg., V-shaped, inverse V-shaped, W-shaped and M-shaped have been investigated for Reynolds numbers ranging from 150,000 to 400,000. The ribs were installed on two opposite walls of a straight duct with aspect ratio of unity. For very high Reynolds numbers, the heat transfer enhancement levels for different rib shapes varied between 1.3 and 1.7 and the
thermal hydraulic performance was found to be less than unity.
Advisors/Committee Members: Ekkad, Srinath V. (committeechair), Qiao, Rui (committee member), Pitchumani, Ranga (committee member).
Subjects/Keywords: High Reynolds number; rib turbulators; thermal hydraulic performan
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APA (6th Edition):
Zhang, M. (2018). Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/81859
Chicago Manual of Style (16th Edition):
Zhang, Mingyang. “Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography.” 2018. Masters Thesis, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/81859.
MLA Handbook (7th Edition):
Zhang, Mingyang. “Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography.” 2018. Web. 17 Jan 2021.
Vancouver:
Zhang M. Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/81859.
Council of Science Editors:
Zhang M. Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/81859
University of Oklahoma
10.
Huang, Kai.
Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method.
Degree: PhD, 2015, University of Oklahoma
URL: http://hdl.handle.net/11244/15222
► Hydraulic fracturing is a major technique in reservoir stimulation to enhance production. Better understanding of mechanisms of hydraulic fracturing is essential for designing hydraulic fracture…
(more)
▼ Hydraulic fracturing is a major technique in reservoir stimulation to enhance production. Better understanding of mechanisms of
hydraulic fracturing is essential for designing
hydraulic fracture treatments. Multiple physical processes are involved in
hydraulic fracturing propagation and active in determination of the growth of a propagating flow induced fracture. The rock deformation, fracture mechanical responses, fluid flow and
thermal diffusion need to be coupled studied to represent the realistic behaviors in the petroleum and geothermal reservoir. In this work, motivated by the limitations of the existing fracture simulators and urgent needs for true 3D
hydraulic fracturing model, three-dimensional numerical approaches implemented in finite element method are developed to simulate rock failure and coupled
hydraulic and
thermal fracture propagation problems.
Due to the complex geological conditions of rock formation such as nonlinearity, anisotropy, heterogeneity and existence of large discontinuity, the behaviors of realistic rock in the reservoir are extremely difficult to be characterized and modeled. Finding a suitable and affordable constitutive model for rocks is a crucial part in the rock mechanics and its applications in petroleum industry. Multi-scale virtual multidimensional internal bonds (VMIB) model and continuum damage model are presented in this work providing solutions from different aspects on solving the nonlinear responses of rock. Moreover, the phenomenon and cause of mesh size sensitivity due to using local strain softening model are introduced. Verified by the simulation results, the mesh size sensitivity is minimized through adopting nonlocal damage theory.
Three dimensional element partition method (3D EPM) is adopted to represent the mechanical behaviors of fracture surface such as contact and friction of closed fracture surfaces. Taking advantage of efficiency and simplicity of 3D EPM, the fracture mechanical response and moving boundary conditions in the
hydraulic fracturing process are well represented, especially for true 3D simulation.
Though the fracture process is a fully coupled nonlinear problem, the present dissertation studies the
hydraulic and
thermal effects separately. The 3D
thermal fracture propagation due to transient cooling in quasi-brittle rock is studied using VMIB model combined with 3D EPM. The nonlinearities of mechanical behaviors and
thermal parameters of the solid material were captured by introducing nonlinear VMIB model into thermo-mechanical coupled governing equations. On the aspects of fluid flow, poroelastic model and lubrication theory are introduced based on different flow mechanisms. Lubrication theory integrally considered the physical behaviors of both rock formation and fluid. The unknown variables are solved by trial and iterations. Nonlocal damage model and the relative technique are adopted for the first time in
hydraulic fracturing simulation. To capture the
hydraulic fracture propagation in natural fractured formation, the modified…
Advisors/Committee Members: Ghassemi, Ahmad (advisor), Rich, Jamie (committee member), Jamili, Ahmad (committee member), Rai, Chandra (committee member), Devegowda, Deepak (committee member).
Subjects/Keywords: hydraulic fracturing; finite element method; damage mechanics; thermal fracture propagation
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APA (6th Edition):
Huang, K. (2015). Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/15222
Chicago Manual of Style (16th Edition):
Huang, Kai. “Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed January 17, 2021.
http://hdl.handle.net/11244/15222.
MLA Handbook (7th Edition):
Huang, Kai. “Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method.” 2015. Web. 17 Jan 2021.
Vancouver:
Huang K. Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11244/15222.
Council of Science Editors:
Huang K. Numerical Simulations of Fracture Propagation Applied to Petroleum and Geothermal Reservoir Using Finite Element Method. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/15222
University of Notre Dame
11.
Weihua Cai.
Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>.
Degree: Aerospace and Mechanical Engineering, 2006, University of Notre Dame
URL: https://curate.nd.edu/show/nz805x2458r
► Thermal-hydraulic networks are widely used in the heating and cooling of building complexes, industrial processes, power plants, and in many other applications. A single…
(more)
▼ Thermal-
hydraulic networks are widely used in
the heating and cooling of building complexes, industrial
processes, power plants, and in many other applications. A single
pipe with a flow-control valve is a basic unit in a
thermal-
hydraulic network, and therefore transient pipe flow due to
control-valve actuation is studied first. Different analytical
approximations are applied to this nonlinear problem, and of these
the homotopy analysis method is shown to be the most promising. The
study is then extended to a simple piping network, for which the
mathematical model is a set of nonlinear differential-algebraic
equations. By constructing a homotopy deformation of these
equations, a dynamical system is obtained which is more tractable
than the original. The hydrodynamic and
thermal
interaction between subsystems as the network goes from one steady
state to another is studied experimentally. A step change is
introduced by manually actuating a valve in one loop, which results
in temperature and pressure changes in the other loops. The
response time of the temperature is found to be an order of
magnitude higher than that of the flow rate, which is again an
order of magnitude higher than for the pressure difference. There
is significant interaction between the loops, and that it is
dependent on the initial operating condition. The hydrodynamic and
thermal responses are found to be very different. The experimental
results are explained using a mathematical model of the
processes. Self-sustained flow and temperature
oscillations occur in
thermal-
hydraulic networks with thermostatic
control. Experiments are conducted of the synchronization of
coupled oscillators set up by the simultaneous action of multiple
controllers on different secondary loops. Frequency locking, phase
synchronization as well as phase slips are observed to occur due to
thermal-
hydraulic coupling between the controllers. A simplified
mathematical model of synchronization in a system with many
thermostatically-controlled oscillators is developed. Each
subsystem is coupled with its neighbors by conductive heat
transfer, and they are arranged in the form of a ring. The
properties of the system are discussed, and numerical simulations
are performed. The results show the presence of a rich array of
synchronization dynamics.
Advisors/Committee Members: Mihir Sen, Committee Member, K.T. Yang, Committee Member, Joseph M. Powers, Committee Member, J. William Goodwine, Jr., Committee Member, Panos.J.Antsaklis, Committee Chair.
Subjects/Keywords: Thermal-hydraulic Networks; Synchronization; Thermal Control; Nonlinear Dynamics
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APA (6th Edition):
Cai, W. (2006). Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/nz805x2458r
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cai, Weihua. “Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>.” 2006. Thesis, University of Notre Dame. Accessed January 17, 2021.
https://curate.nd.edu/show/nz805x2458r.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cai, Weihua. “Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>.” 2006. Web. 17 Jan 2021.
Vancouver:
Cai W. Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>. [Internet] [Thesis]. University of Notre Dame; 2006. [cited 2021 Jan 17].
Available from: https://curate.nd.edu/show/nz805x2458r.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cai W. Nonlinear Dynamics of Thermal-hydraulic
Networks</h1>. [Thesis]. University of Notre Dame; 2006. Available from: https://curate.nd.edu/show/nz805x2458r
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
12.
Langford, Mathew T.
Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat.
Degree: PhD, Department of Civil and Environmental
Engineering, 2016, University of Alberta
URL: https://era.library.ualberta.ca/files/c9s1616212
► The development of hydropower facilities greatly affects the morphology of regional water resources, as well as the physical, chemical and biological factors of upstream aquatic…
(more)
▼ The development of hydropower facilities greatly
affects the morphology of regional water resources, as well as the
physical, chemical and biological factors of upstream aquatic
ecosystems. Evaluating the environmental impacts of hydropower
operations is important in a regulatory context. Of particular
interest is investigating fish entrainment risk, which has been
identified as one of the key impacts of hydropower generation on
the productivity and biodiversity of aquatic species. Entrainment
results when fish of the upstream reservoir are passed through the
turbines of a dam. The risk of fish entrainment at a particular
facility is correlated with the effect of intake withdrawals on the
flow and thermal structures of the forebay. Developing an
understanding of the upstream hydraulics at hydropower dams is a
key component of studying fish entrainment risk. Deep lakes and
reservoirs in northern climates have a dimictic stratification
cycle and generally thermal stratification develops in later summer
and fall. Some reservoirs can be approximated by a distinct
two-layer stratification profile, with a sharp temperature change
at the thermocline; however this is not the case for all
reservoirs. The shape of the thermal profile is controlled by solar
insolation as well as surficial wind mixing, a lack of which may
result in a less distinct hyperbolic thermal profile. The vertical
density distribution of a stratified reservoir may limit the
elevation at which water is withdrawn at hydropower facilities,
known as selective withdrawal. When evaluating the physical impacts
of hydropower generation on the upstream forebay (hydraulic and
thermal characteristics), it is important to not only look at the
direct impacts to fish, but also the impacts to the geometry of the
forebay itself. The potential for sediments to deposit on the
reservoir bed, or be entrained into the flow is a dynamic process
that can lead to significant changes in reservoir bathymetry over
time. The coarseness of the bed material also has an impact on
fishes habitat use (i.e. fish fry commonly inhabit gravel beds).
Determination of the wall shear stress induced by hydropower flows
may dictate the bed form’s dynamics upstream of a facility, the
anticipated substrate size and potential habitat utilization
adjacent to the intake. The objectives of this thesis are to use
numerical modelling to evaluate the impact of hydropower operations
on erosion and sedimentation patterns, thermal structure and flow
field upstream of hydropower facilities. This knowledge can then be
applied in the context of evaluating fish entrainment risk. CFD
models have been used to simulate the flow field in the forebay of
Aberfeldie Dam on the Bull River, Mica Dam on the Columbia River
and Revelstoke Dam on the Columbia River in British Columbia,
Canada. These sites include both shallow and deep reservoirs as
well as run-of-the-river and storage reservoirs. These models were
verified through detailed hydroacoustic field measurements at both
Aberfeldie and Mica Dams. This thesis…
Subjects/Keywords: Hydraulic Engineering; Hydropower; Computational Fluid Dynamics; Fish Entrainment; Thermal Stratification; Erosion and Sedimentation
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MLA ·
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Manager
APA (6th Edition):
Langford, M. T. (2016). Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c9s1616212
Chicago Manual of Style (16th Edition):
Langford, Mathew T. “Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat.” 2016. Doctoral Dissertation, University of Alberta. Accessed January 17, 2021.
https://era.library.ualberta.ca/files/c9s1616212.
MLA Handbook (7th Edition):
Langford, Mathew T. “Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat.” 2016. Web. 17 Jan 2021.
Vancouver:
Langford MT. Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat. [Internet] [Doctoral dissertation]. University of Alberta; 2016. [cited 2021 Jan 17].
Available from: https://era.library.ualberta.ca/files/c9s1616212.
Council of Science Editors:
Langford MT. Predicting the Hydraulic Influence of Hydropower Operations
on Upstream Aquatic Habitat. [Doctoral Dissertation]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c9s1616212
Texas A&M University
13.
McDermott, Patrick 1987-.
Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01.
Degree: MS, Nuclear Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148227
► One of the greatest challenges facing the nuclear power industry is the final disposition of nuclear waste. To meet the needs of the nuclear power…
(more)
▼ One of the greatest challenges facing the nuclear power industry is the final disposition of nuclear waste. To meet the needs of the nuclear power industry, a new fuel assembly design, called DUPLEX, has been developed which provides higher fuel burnups, burns transuranic waste while reducing minor actinides, reduces the long term radiotoxicity of spent nuclear fuel, and was developed for use in current light water reactors. The DUPLEX design considered in this thesis is based on a seed and blanket unit (SBU) configuration, where the seed region contains standard UO2 fuel, and the blanket region contains an inert matrix (Pu,Np,Am)O2-MgO-ZrO2 fuel.
The research efforts of this thesis are first to consider the higher burnup effects on DUPLEX assembly
thermal-
hydraulic performance and
thermal safety margin over the assembly’s expected operational lifetime. In order to accomplish this, an existing burnup-dependent
thermal-
hydraulic methodology for conventional homogeneous fuel assemblies has been updated to meet the modeling needs specific to SBU-type assemblies. The developed framework dramatically expands the capabilities of the latest
thermal-
hydraulic evaluation framework such that the most promising and unique DUPLEX fuel design can be evaluated. As part of this updated methodology, the posed DUPLEX design is evaluated with respect to the minimum departure from nucleate boiling ratio, peak fuel temperatures for both regions, and the peak cladding temperatures, under ANS Condition I, II, and III transient events with the
thermal-
hydraulic code VIPRE-01.
Due to difficulty in the fabrication and handling of minor actinide dioxides, documented
thermal conductivity values for the considered IMF design are unavailable. In order to develop a representative
thermal conductivity model for use in VIPRE-01, an extensive literature survey on the
thermal conductivity of (Pu,Np,Am)O2-MgO-ZrO2 component materials and a comprehensive review of combinatory models was performed.
Using the updated methodology, VIPRE-01 is used to perform steady-state and transient
thermal hydraulic analyses for the DUPLEX fuel assembly. During loss-of-flow accident scenarios, the DUPLEX design is shown to meet imposed safety criteria. However, using the most conservative
thermal conductivity modeling approach for (Pu,Np,Am)O2-MgO-ZrO2, the blanket region fuel temperatures remain only slightly below the design limit.
Advisors/Committee Members: Ragusa, Jean (advisor), Vierow, Karen (advisor), Radovic, Miladin (committee member).
Subjects/Keywords: Heterogeneous Fuel Assembly; DUPLEX; Nuclear; Thermal-hydraulic; VIPRE; VIPRE-01; Seed-Blanket Unit; SBU
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APA (6th Edition):
McDermott, P. 1. (2012). Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148227
Chicago Manual of Style (16th Edition):
McDermott, Patrick 1987-. “Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01.” 2012. Masters Thesis, Texas A&M University. Accessed January 17, 2021.
http://hdl.handle.net/1969.1/148227.
MLA Handbook (7th Edition):
McDermott, Patrick 1987-. “Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01.” 2012. Web. 17 Jan 2021.
Vancouver:
McDermott P1. Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1969.1/148227.
Council of Science Editors:
McDermott P1. Thermal-Hydraulic Analysis of Seed-Blanket Unit Duplex Fuel Assemblies with VIPRE-01. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148227
Penn State University
14.
Garrett, Grant Robert.
Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE.
Degree: 2018, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/15210grg5094
► The purpose of this study is to compare the use of water, helium, and carbon dioxide as coolants for Generation IV and fusion power plants.…
(more)
▼ The purpose of this study is to compare the use of water, helium, and carbon dioxide as coolants for Generation IV and fusion power plants. The Symbolic Nuclear Analysis Package (SNAP) was used to create input files for the TRAC/RELAP Advanced Computational Engine (TRACE)
thermal hydraulics and neutronics coupled code representing this phenomenon. In addition, TRACE was used to perform simulations comparing how Helium, Carbon Dioxide, and water perform as coolants for power plant systems.
To start, a TRACE model was built for each coolant of this study that represented a 600 MW
th fusion Field Reversed Configuration (FRC) power plant. The vessel and power source were the same for each model of this study. The TRACE models include all components of the primary side of a Rankin cycle power plant, including pumps, heat exchangers, a reactor vessel, pipes, coolant channels, etc. The reactor vessel in the TRACE models represented a hollow cylinder at vacuum with a fusion FRC power source inside this hollow cylinder. The materials that comprised the cylinder wall were chosen based on
thermal conductivity, attenuation coefficients, and other factors. Part of the cylinder wall was coolant channels with the coolant flowing through it. Besides flow through the steam generators, most of the secondary side components were represented by a control system that calculated the turbine output work. Once the model for each coolant was built, simulations were performed to ensure the models reached steady state.
After the models prove to reach steady state, parameters were changed to optimize the performance of the systems for each coolant based on the various system requirements. The final water cooled model operated at similar conditions to those of a PWR. The final helium and carbon dioxide cooled models operated at conditions based on AGRs, GFRs, and other similar gas cooled systems. Simulations were performed, and the results were used to analyze how each coolant performs for the power system analyzed in this study. Before performing analysis based on the TRACE predicted results, verification was performed for helium and carbon dioxide in TRACE because TRACE is only verified and validated with water as the fluid in simulations.
To ensure the results from the helium cooled and carbon dioxide cooled TRACE models were reliable, the method of manufactured solutions was used to perform verification for various test cases. The TRACE results were compared to hand calculated results for identical test cases. The verification process determined the TRACE predicted results from the helium and carbon dioxide models were reliable for the range of conditions of each respective model. Further verification and validation can be performed for helium and carbon dioxide as fluids in TRACE models and simulations.
After performing the tasks mentioned in the previous paragraphs, analysis was performed based on the TRACE predicted results for each coolant. Based on the system requirements and the results from the…
Advisors/Committee Members: Justin Kyle Watson, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Generation IV Reactors; Water; Helium; Carbon Dioxide; Thermal-Hydraulic Simulation; TRACE; SNAP; Fusion Reactors
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APA (6th Edition):
Garrett, G. R. (2018). Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15210grg5094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Garrett, Grant Robert. “Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE.” 2018. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/15210grg5094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Garrett, Grant Robert. “Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE.” 2018. Web. 17 Jan 2021.
Vancouver:
Garrett GR. Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/15210grg5094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Garrett GR. Comparison of Water, Helium, and Carbon Dioxide as Coolants for Next Generation Power Plants using TRACE. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15210grg5094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
North-West University
15.
Fick, Lambert Hendrik.
Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
.
Degree: 2013, North-West University
URL: http://hdl.handle.net/10394/13331
► The modelling of multi-phase water flow is an important modern-day design tool used by engineers to develop practical systems which are beneficial to society .…
(more)
▼ The modelling of multi-phase water
flow is an important modern-day design tool used by engineers
to develop practical systems which are beneficial to society . Multi-phase water
flow can
be found in many important industrial applications such as large scale conventional and nuclear
power systems, heat transfer machinery, chemical process plants, and other important examples.
Because of many inherent complexities in physical two-phase
flow processes, no generalised
system of equations has been formulated that can accurately describe the two-phase
flow of water at all flow conditions and system geometries. This has led to the development of many different models for the simulation of two-phase
flow at specific conditions. These models vary greatly in complexity.
The simplest model that can be used to simulate two-phase
flow is termed the homogeneous equilibrium (HEM) two-phase flow model. This model has been found useful in investigations of choking and flashing
flows, and as an initial investigative model used before the formulation
of more complex models for specific applications. This
flow model is fully de ned by three conservation
equations, one each for mass, momentum and energy. To close the model, an equation
of state (EOS) is required to deliver system pressure values. When solving the HEM, a general
practice is to employ an equation of state that is derived from a fundamental expression of the
second law of thermodynamics. This methodology has been proven to deliver accurate results
for two-phase system simulations.
This study focused on an alternative formulation of the equation of state which was previously
developed for the time dependent modelling of HEM two-phase
flow systems, termed the rate
form of the equation of state (RFES). The goal of the study was not to develop a new formulation
of the EOS, but rather to implement the RFES in a transient simulation model and to
verify that this implementation delivers appropriate results when compared to the conventional
implementation methodology. This was done by formulating a transient pipe and reservoir
network model with the HEM, and closing the model using both the RFES and a benchmark
EOS known to deliver accurate system property values. The results of the transient model
simulations were then compared to determine whether the RFES delivered the expected results.
It was found that the RFES delivered sufficiently accurate results for a variety of system
transients, pressure conditions and numerical integration factors.
Subjects/Keywords: Equation of state;
Rate form;
Two-phase flow;
Thermal-hydraulic system;
Transient simulation
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fick, L. H. (2013). Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
. (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/13331
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fick, Lambert Hendrik. “Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
.” 2013. Thesis, North-West University. Accessed January 17, 2021.
http://hdl.handle.net/10394/13331.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fick, Lambert Hendrik. “Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
.” 2013. Web. 17 Jan 2021.
Vancouver:
Fick LH. Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
. [Internet] [Thesis]. North-West University; 2013. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10394/13331.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fick LH. Application of the rate form of the equation of state for the dynamic simulation of thermal-hydraulic systems / Lambert Hendrik Fick
. [Thesis]. North-West University; 2013. Available from: http://hdl.handle.net/10394/13331
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Muñoz Cámara, José.
Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
.
Degree: Ingeniería Térmica y de Fluidos, 2020, Universidad Politécnica de Cartagena
URL: http://hdl.handle.net/10317/8507
► [SPA] En este trabajo se realiza un estudio detallado de las características termohidráulicas de los reactores de flujo oscilatorio. Estos dispositivos consisten en un equipo…
(more)
▼ [SPA] En este trabajo se realiza un estudio detallado de las características termohidráulicas de los reactores de flujo oscilatorio. Estos dispositivos consisten en un equipo tubular de operación continua en el que se inserta una geometría para promocionar el mezclado y, a su vez, se superpone un flujo oscilatorio. La geometrías insertadas estudiadas han sido los deflectores de un solo orificio y los deflectores de tres orificios. La interacción de la geometría insertada y del caudal oscilatorio permite promover la transferencia de calor junto con el mezclado radial, de forma que es posible trabajar con bajos caudales netos (para los que correspondería un flujo laminar) y, a la vez, obtener coeficientes de transferencia de calor e intensidades de mezclado propias de un flujo turbulento. Como principal aplicación de estos dispositivos destacan las reacciones químicas con un alto tiempo de residencia, que imponen trabajar con bajos caudales netos si se quiere obtener un tamaño razonable del equipo. La metodología empleada a lo largo de la Tesis ha sido fundamentalmente experimental. Uno de las mayores complejidades de estos dispositivos es la naturaleza oscilatoria del flujo, lo que ha llevado a desarrollar una metodología específica para esta aplicación, tanto para la visualización de los patrones de flujo como para cuantificar la disipación de potencia. Los patrones de flujo se han analizado mediante dos técnicas complementarias: la visualización mediante burbujas de hidrógeno y la Velocimetría por Imágenes de Partículas. Los ensayos han permitido observar el comportamiento del flujo en varias condiciones de operación con flujo neto, oscilatorio o ambos superpuestos. El consumo de potencia asociado al flujo neto se ha caracterizado mediante el factor de fricción de Fanning, medido para un amplio rango de números de Reynolds neto, observándose las regiones de flujo laminar, de transición y turbulento. En cuanto al consumo de potencia asociado al flujo oscilatorio, se ha analizado un amplio rango de números de Reynolds oscilatorio y de amplitudes de oscilación, proporcionando por primera vez resultados experimentales adimensionalizados. Para ello, se han definido el factor de fricción de Fanning oscilatorio y el número de Potencia. La transferencia de calor se ha estudiado para un amplio rango de números de Reynolds neto, números de Reynolds oscilatorio y números de Prandtl; proporcionándose correlaciones del número de Nusselt en función de dichos números adimensionales. También se estudian otros aspectos de la transferencia de calor como son la estratificación o el número de Nusselt local. Por último, se ha desarrollado un modelo numérico para evaluar la caída de presión en régimen laminar, tanto en condiciones de flujo neto como oscilatorio. Este modelo ha sido validado con los resultados experimentales y ha permitido estudiar en mayor detalle otros conceptos como son la periodicidad espacial y temporal. Toda esta información ha permitido ampliar el conocimiento acerca de ciertos aspectos de los reactores de flujo…
Advisors/Committee Members: Solano Fernández, Juan Pedro (advisor), Pérez García, José (advisor).
Subjects/Keywords: Termohidráulica;
Intercambiador de calor compacto;
Materiales;
Termodinámica;
Thermal-hydraulic;
Heat exchangers;
Materials;
Thermodynamics
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muñoz Cámara, J. (2020). Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
. (Thesis). Universidad Politécnica de Cartagena. Retrieved from http://hdl.handle.net/10317/8507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Muñoz Cámara, José. “Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
.” 2020. Thesis, Universidad Politécnica de Cartagena. Accessed January 17, 2021.
http://hdl.handle.net/10317/8507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Muñoz Cámara, José. “Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
.” 2020. Web. 17 Jan 2021.
Vancouver:
Muñoz Cámara J. Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
. [Internet] [Thesis]. Universidad Politécnica de Cartagena; 2020. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10317/8507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Muñoz Cámara J. Análisis experimental de los mecanismos de mejora termohidráulica en reactores de flujo oscilatorio
. [Thesis]. Universidad Politécnica de Cartagena; 2020. Available from: http://hdl.handle.net/10317/8507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
17.
Schütz, Stanislav.
Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/66561
► Regenerative heat exchangers are established as a means of heat recovery in many industrial applications. The fixed-bed regenerators are mostly used to transfer heat from…
(more)
▼ Regenerative heat exchangers are established as a means of heat recovery in many industrial applications. The fixed-bed regenerators are mostly used to transfer heat from hot flue gas to cold air. In this work, several mathematical models of regenerators and several calculation methods were compared, while the preferred method is Willmott’s open method from 1964. Analysis of the influence of geometrical and operational parameters was carried out for the linear regenerator model.
Advisors/Committee Members: Kilkovský, Bohuslav (advisor), Jegla, Zdeněk (referee).
Subjects/Keywords: Regenerátor; Tepelně-hydraulický výpočet; Sypaný regenerátor; Python; Regenerator; Thermal-hydraulic calculation; Fixed-bed regenerator; Python
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Schütz, S. (2019). Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66561
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schütz, Stanislav. “Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger.” 2019. Thesis, Brno University of Technology. Accessed January 17, 2021.
http://hdl.handle.net/11012/66561.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schütz, Stanislav. “Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger.” 2019. Web. 17 Jan 2021.
Vancouver:
Schütz S. Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11012/66561.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schütz S. Výpočet regeneračního výměníku tepla: The basic design of regenerative heat exchanger. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/66561
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kansas State University
18.
Dahariya, Smreeti.
High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces.
Degree: PhD, Department of Mechanical and
Nuclear Engineering, 2020, Kansas State University
URL: http://hdl.handle.net/2097/40311
► Boiling has received considerable attention in the technology advancement of electronics cooling for high-performance computing applications. Two-phase cooling has an advantage over a single-phase cooling…
(more)
▼ Boiling has received considerable attention in the
technology advancement of electronics cooling for high-performance
computing applications. Two-phase cooling has an advantage over a
single-phase cooling in the high heat removal rate with a small
thermal gradient due to the latent heat of vaporization. Many
surface modifications have been done in the past including surface
roughness, mixed wettability and, porous wick copper play a crucial
role in the liquid-vapor phase change heat transfer. However, the
mechanisms of high-pressure pool-boiling heat transfer enhancement
due to surface modifications has not been well studied or
understood. The properties of water, such as the latent heat of
vaporization, surface tension, the difference in specific volume of
liquid and vapor, decrease at high-pressure. High-pressure
pool-boiling heat transfer enhancement is studied fundamentally on
various engineered surfaces. The boiling tests are performed at a
maximum pressure of 90 psig (620.5 kPa) and then compared to
results at 0 psig (0 kPa). The results indicate that the pressure
influences the boiling performance through changes in bubble
dynamics. The bubble departure diameter, bubble departure
frequency, and the active nucleation sites change with pressure.
The pool-boiling heat transfer enhancement of a Teflon© coated
surface is also experimentally tested, using water as the working
fluid. The boiling results are compared with a plain surface at two
different pressures, 30 and 45 psig. The maximum heat transfer
enhancement is found at the low heat fluxes. At high heat fluxes, a
negligible effect is observed in HTC. The primary reasons for the
HTC enhancement at low heat fluxes are active nucleation sites at
low wall superheat and bubble departure size. The Teflon© coated
surface promotes nucleation because of the lower surface energy
requirement.
The boiling results are also obtained for wick
surfaces. The wick surfaces are fabricated using a sintering
process. The boiling results are compared with a plain surface. The
reasons for enhancements in the pool-boiling performance are
primarily due to increased bubble generation, higher bubble release
frequency, reduced
thermal-
hydraulic length modulation, and
enhanced
thermal conductivity due to the sintered wick layer. The
analysis suggests that the Rayleigh-critical wavelength decreases
by 4.67 % of varying pressure, which may cause the bubble pinning
between the gaps of sintered particles and avoids the bubble
coalescence. Changes in the pitch distance indicate that a
liquid-vapor phase separation happens at the solid/liquid
interface, which impacts the heat-transfer performance
significantly.
Similarly, the role of the high-pressure over the
wicking layer is further analyzed and studied. It is found that the
critical flow length, λu reduces by three times with 200 μm
particles. The results suggest that the porous wick layer provides
a capillary-assist to liquid flow effect, and delays the surface
dry out. The surface modification and the pressure amplify the
boiling heat…
Advisors/Committee Members: Amy R. Betz.
Subjects/Keywords: Critical
Heat Flux; Heat
Transfer Coefficient;
Thermal-Hydraulic;
Rayleigh-Critical Wavelength; Pinning
Mechanism; Capillary
Pressure
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dahariya, S. (2020). High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40311
Chicago Manual of Style (16th Edition):
Dahariya, Smreeti. “High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces.” 2020. Doctoral Dissertation, Kansas State University. Accessed January 17, 2021.
http://hdl.handle.net/2097/40311.
MLA Handbook (7th Edition):
Dahariya, Smreeti. “High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces.” 2020. Web. 17 Jan 2021.
Vancouver:
Dahariya S. High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces. [Internet] [Doctoral dissertation]. Kansas State University; 2020. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/2097/40311.
Council of Science Editors:
Dahariya S. High-pressure
pool-boiling heat transfer enhancement and mechanism on engineered
surfaces. [Doctoral Dissertation]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40311
Colorado School of Mines
19.
Kumar, Dharmendra.
Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems.
Degree: PhD, Civil and Environmental Engineering, 2014, Colorado School of Mines
URL: http://hdl.handle.net/11124/321
► The thesis presents the development and validation of hydraulic fracturing and heat extraction models for Enhanced Geothermal Systems (EGS). The fracture models are developed using…
(more)
▼ The thesis presents the development and validation of
hydraulic fracturing and heat extraction models for Enhanced Geothermal Systems (EGS). The fracture models are developed using the Displacement Discontinuity (DD) Method which is an indirect Boundary Element approach. Two types fracture models are developed: based on the constant strength DD method and based on the Kelvin's fundamental-solution DD method. Analytical verification for each method is included. The DD model, based on the Kelvin's fundamental solution, presents a more robust and efficient technique for the fracture modeling. Various issues for the implementation of the Boundary Element Method for the fracture mechanics problems such as hyper-singularity and fracture tip singularity of stresses have been accounted in the numerical model. The Newtonian fracture fluid flow is modeled for steady and transient flow cases. Steady-state fracture fluid flow is modeled using implicit Finite Difference Method, and transient fluid flow is modeled based on the Galerkin's Finite Element approach. The fracture heat flow is modeled considering two cases: heat flow analysis during the fracture initiation and propagation processes, and long term heat circulation and extraction model for
thermal energy production form an EGS reservoir. Two-dimensional and three-dimensional heat extraction models based on the Boundary Integral Equation formulations are formulated. In both the model, Laplace transform technique is used to deal with the time variable. The weak singularity cases have been considered for both two- and three-dimensional models. The
thermal induced stresses due to differential cooling of the reservoir rocks are accounted for. Explicit hydro-mechanical and thermo-mechanical models for two-dimensional are established. Finally, the field validation of the heat circulation test is done using three-dimensional heat extraction. The validation of experimental result based on the analytical fracture model is also performed.
Advisors/Committee Members: Gutierrez, Marte S. (advisor), Berger, John R. (committee member), Martin, P. A. (committee member), Tutuncu, Azra (committee member), Wu, Yu-Shu (committee member).
Subjects/Keywords: enhanced geothermal systems; boundary element method; thermal induced stresses; hydraulic fracturing; fracture heat flow; fracture fluid flow; Geothermal resources; Hydraulic fracturing; Boundary element methods; Fracture mechanics; Fluid dynamics; Heat – Conduction
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kumar, D. (2014). Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/321
Chicago Manual of Style (16th Edition):
Kumar, Dharmendra. “Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems.” 2014. Doctoral Dissertation, Colorado School of Mines. Accessed January 17, 2021.
http://hdl.handle.net/11124/321.
MLA Handbook (7th Edition):
Kumar, Dharmendra. “Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems.” 2014. Web. 17 Jan 2021.
Vancouver:
Kumar D. Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11124/321.
Council of Science Editors:
Kumar D. Development and validation of thermo-hydro-mechanical simulator model for enhanced geothermal systems. [Doctoral Dissertation]. Colorado School of Mines; 2014. Available from: http://hdl.handle.net/11124/321
Universidade do Rio Grande do Sul
20.
Castro, Richard de Medeiros.
Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado.
Degree: 2012, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/70708
► Devido à necessidade de obtenção de uma superfície resistente ao desgaste e a oxidação, os cilindros hidráulicos são tradicionalmente revestidos com cromo duro eletrodepositado. Todavia,…
(more)
▼ Devido à necessidade de obtenção de uma superfície resistente ao desgaste e a oxidação, os cilindros hidráulicos são tradicionalmente revestidos com cromo duro eletrodepositado. Todavia, este tipo de revestimento apresenta uma redução gradual do coeficiente de atrito, interferindo diretamente na lubrificação da haste, ocasionando danos aos elementos de vedação e promovendo consequentes vazamentos. Outro apelo contrário à utilização do processo de revestimento com cromo é a presença, em elevados níveis, de cromo hexavalente Cr+6, apresentando alto poder cancerígeno e de contaminação ambiental. Atualmente, o processo de aspersão térmica em alta velocidade (HVOF - High Velocity Oxi-Fuel) se caracteriza como uma técnica de revestimento alternativa ao cromo duro, utilizando materiais compósitos (metal-cerâmico), os quais propiciam baixas taxas de desgaste. Este trabalho tem como objetivo avaliar o desempenho de revestimentos aplicados em hastes de cilindros hidráulicos revestidas com WC-CoCr pelo processo HVOF, em comparação ao revestimento de cromo duro eletrodepositado. As técnicas de caracterização empregadas foram divididas em duas etapas, sendo que a primeira foi: análise microestrutural, ensaios de dureza e desgaste, medições de rugosidade e perfilometria, em corpos de prova planos e, na segunda etapa, a análise dos revestimentos adquiridos através de uma bancada de testes de hastes de cilindros hidráulicos, onde a caracterização foi obtida através de, medições específicas dos principais parâmetros de rugosidades aplicadas a superfícies de vedação, como Rz, Rmáx e Rmr, desgaste visuais das hastes e vedações e medições de vazamento de óleo. Ao final, os resultados mostram que o revestimento aspergido, indica características competitivas em relação à eletrodeposição de cromo, podendo ser aplicado em hastes de cilindros hidráulicos com algumas vantagens, como por exemplo, maior resistência ao desgaste, menor coeficiente de atrito, menores taxas de vazamento e melhores condições finais de superfícies.
To obtain a surface that is resistant to wear and oxidation, hydraulic cylinders are typically coated with in hard chromium through the process of electroplating process. However, this type of coating displays a gradual reduction of the friction coefficient as the lubrication directly interferes with the shaft mechanism, which in turn causes damage to the sealing elements and promotes subsequent leakage. Another disadvantage in using the electroplated hard chromium process is the presence of high level hexavalent chromium Cr+6 which is not only carcinogenic, but also extremely contaminating to the environment. Currently, the alternative process of high-speed thermal spraying (HVOF - High Velocity Oxy-Fuel), as opposed to hard chrome coating, uses composite materials (metalceramic) possessing low wear rates. This study aims to evaluate and compare the performance of hydraulic cylinder rods coated with WC-CoCr in the HVOF process, and those coated with electroplated hard chromium. The characterization techniques employed…
Advisors/Committee Members: Rocha, Alexandre da Silva.
Subjects/Keywords: Aspersão térmica; Hard chrome; Eletrodeposição; Thermal spray; HVOF; Cromo; Aço; Wear; Hydraulic cylinders; Revestimento; Ensaios de materiais
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APA (6th Edition):
Castro, R. d. M. (2012). Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/70708
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Castro, Richard de Medeiros. “Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado.” 2012. Thesis, Universidade do Rio Grande do Sul. Accessed January 17, 2021.
http://hdl.handle.net/10183/70708.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Castro, Richard de Medeiros. “Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado.” 2012. Web. 17 Jan 2021.
Vancouver:
Castro RdM. Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10183/70708.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Castro RdM. Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado. [Thesis]. Universidade do Rio Grande do Sul; 2012. Available from: http://hdl.handle.net/10183/70708
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Hoeppner, Ana Flávia da Silva.
Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP).
Degree: Mestrado, Hidráulica e Saneamento, 2007, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/
;
► As lagoas de estabilização compõem sistemas de tratamento de águas residuárias sujeitos à variação de eficiência decorrente, dentre outros fatores, das variações climáticas. A variação…
(more)
▼ As lagoas de estabilização compõem sistemas de tratamento de águas residuárias sujeitos à variação de eficiência decorrente, dentre outros fatores, das variações climáticas. A variação de eficiência e da estratificação em lagoas de estabilização, localizadas em ambiente subtropical, em diferentes épocas do ano, foi o principal objetivo dessa pesquisa. Para essa finalidade, a eficiência de dois sistemas de lagoas de estabilização localizadas no Vale do Ribeira de Iguape (SP) - nas cidades de Jacupiranga e Pariquera-Açu - foi determinada, em período sazonal (quatro épocas do ano) e semanal (três dias consecutivos), assim como perfis de temperatura, condutividade elétrica, pH e oxigênio dissolvido e aspectos ambientais (temperatura do ar, radiação solar, direção e velocidade do vento e precipitação) foram mensurados. Além disso, aspectos operacionais, tais como, volume de lodo, de água, vazão e tempo de detenção teórico foram mensurados a fim de caracterizar apenas as lagoas facultativas. Alterações no comportamento sazonal destas variáveis e padrões de similaridade entre eficiência de cada lagoa e estratificação térmica foram analisadas através da ferramenta estatística análise do componente principal (PCA). Observou-se, principalmente, que a variação sazonal de eficiência foi relevante, sendo que, em julho/06 a qualidade do afluente e do efluente foi diferente das outras épocas do ano, ou seja, houve variação sazonal de variáveis físicas e químicas. Variação diária foi observada em janeiro/06, época de maiores precipitações e maior homogeneidade térmica. Na PCA, a estratificação térmica foi significativa, ou seja, esteve relacionada com outras variáveis. A vazão e tempo de detenção, nas lagoas facultativas, estiveram dentro de faixas observadas em outras lagoas de estabilização e o volume de lodo não ultrapassou 3% do volume das lagoas.
Stabilization ponds compose systems of wastewater treatment citizens to the variation of efficiency decurrent, amongst other factors, of the climatic variations. The variation of efficiency and stratification in stabilization ponds, located in subtropical environment, at different seasons, was the main objective. For this purpose, the efficiency of two stabilization ponds systems located in the Vale do Ribeira de Iguape (SP) - in cities as Jacupiranga and Pariquera-Açu - was determined, in sazonal period (four seasons) and weekly (three days consecutive), as well as temperature, electric condutivity, pH and dissolved oxygen profiles and environment aspects had been measured (air temperature, solar radiation, direction and speed of the wind and precipitation). Moreover, operational aspects, such as, volume of sludge, volume of water, outflow and theoretical detention times had been measured in order to characterize only the facultative ponds. Alterations in sazonal behavior of these variables and standards of similarity between efficiency and thermal stratification had been analyzed through the tool statistics análise do componente principal (PCA). It was observed, mainly, that the…
Advisors/Committee Members: Calijuri, Maria do Carmo.
Subjects/Keywords: Bathymetry; Batimetria; Estratificação térmica; Hydraulic detention time; Lagoas de estabilização; Sazonalidade; Seasonal variation; Stabilization ponds; Tempo de detenção hidráulico; Thermal stratification
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APA ·
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CSE |
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APA (6th Edition):
Hoeppner, A. F. d. S. (2007). Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP). (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/ ;
Chicago Manual of Style (16th Edition):
Hoeppner, Ana Flávia da Silva. “Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP).” 2007. Masters Thesis, University of São Paulo. Accessed January 17, 2021.
http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/ ;.
MLA Handbook (7th Edition):
Hoeppner, Ana Flávia da Silva. “Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP).” 2007. Web. 17 Jan 2021.
Vancouver:
Hoeppner AFdS. Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP). [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2021 Jan 17].
Available from: http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/ ;.
Council of Science Editors:
Hoeppner AFdS. Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP). [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/ ;
University of Michigan
22.
Nguyen, Tat Nghia.
Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems.
Degree: PhD, Nuclear Engineering & Radiological Sciences, 2020, University of Michigan
URL: http://hdl.handle.net/2027.42/155193
► The high operations and maintenance (O&M) cost for nuclear plants is one of the most significant challenges facing the industry today. The research in this…
(more)
▼ The high operations and maintenance (O&M) cost for nuclear plants is one of the most significant challenges facing the industry today. The research in this thesis is motivated by the ongoing effort to utilize automation and improved operator support technologies to reduce O&M costs in nuclear power plants. A diagnostic framework is first developed for the problem of monitoring equipment health and sensor calibration status in nuclear engineering systems. This is achieved by utilizing real-time data from sensors that are already in place for system monitoring to perform automated diagnostics of equipment degradation. Given the long-time scale over which component degradation typically proceeds, some of the sensors may also inevitably degrade and become unreliable. The need to simultaneously consider equipment and instrument faults is both a technical necessity and a desired capability. The automation of these monitoring tasks contributes to the reduction of the overall O&M cost by reducing the required human resources and by providing better maintenance scheduling.
Early detection of slow degradation over the course of plant operation requires sufficient detection sensitivity from the diagnostic framework. The problem is more complicated in the presence of various sources of uncertainty and possible changes of operating conditions due to plant drifts. To resolve these difficulties and provide the desired capability, the proposed framework is a hybrid integration of quantitative model-based diagnosis, statistical change detection and probabilistic reasoning. Physics-based models are developed to describe the fault-free behavior of system components. Quantitative residuals are generated from the analytical redundancy in each model and serve as fault symptoms for model-based diagnosis. Statistical change detection methods are used to detect changes in the residuals in the presence of uncertainty. Measurement and modelling uncertainty are robustly treated by methods of statistical change detection and probabilistic reasoning. A system level diagnosis framework is proposed to deal with the lack of local sensors to each component.
The overall framework has been implemented and demonstrated with a high-pressure feedwater system whose available sensor set is insufficient for the construction of standalone models for most major components. Results from the demonstration showed that the system level approach can be used to construct models and perform diagnostics for systems with limited instrumentation. Both component faults and sensor faults can be detected, and the effects of uncertainty can be mitigated by the proposed probabilistic reasoning framework. Areas for future work were identified and include the investigation of a dynamic Bayesian network to treat the effects of uncertainty in the diagnosis as well as the investigation of using high fidelity simulation codes to construct simulation-based surrogate models of the basic plant components.
Advisors/Committee Members: Downar, Thomas J (committee member), Vilim, Richard (committee member), Johnsen, Eric (committee member), Manera, Annalisa (committee member), Ozay, Necmiye (committee member), Todreas, Neil (committee member).
Subjects/Keywords: Model-based diagnosis; Physics-based model; Fault diagnosis for thermal-hydraulic systems; Probabilistic reasoning; Nuclear Engineering and Radiological Sciences; Engineering
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APA (6th Edition):
Nguyen, T. N. (2020). Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/155193
Chicago Manual of Style (16th Edition):
Nguyen, Tat Nghia. “Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems.” 2020. Doctoral Dissertation, University of Michigan. Accessed January 17, 2021.
http://hdl.handle.net/2027.42/155193.
MLA Handbook (7th Edition):
Nguyen, Tat Nghia. “Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems.” 2020. Web. 17 Jan 2021.
Vancouver:
Nguyen TN. Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems. [Internet] [Doctoral dissertation]. University of Michigan; 2020. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/2027.42/155193.
Council of Science Editors:
Nguyen TN. Model-Based Diagnostic Frameworks for Fault Detection and System Monitoring in Nuclear Engineering Systems. [Doctoral Dissertation]. University of Michigan; 2020. Available from: http://hdl.handle.net/2027.42/155193
Texas A&M University
23.
Reza, S.M. Mohsin.
Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes.
Degree: PhD, Nuclear Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1354
► Design options have been evaluated for the Modular Helium Reactor (MHR) for higher temperature operation. An alternative configuration for the MHR coolant inlet flow path…
(more)
▼ Design options have been evaluated for the Modular Helium Reactor (MHR) for
higher temperature operation. An alternative configuration for the MHR coolant inlet
flow path is developed to reduce the peak vessel temperature (PVT). The coolant inlet
path is shifted from the annular path between reactor core barrel and vessel wall through
the permanent side reflector (PSR). The number and dimensions of coolant holes are
varied to optimize the pressure drop, the inlet velocity, and the percentage of graphite
removed from the PSR to create this inlet path. With the removal of ~10% of the
graphite from PSR the PVT is reduced from 541 0C to 421 0C.
A new design for the graphite block core has been evaluated and optimized to
reduce the inlet coolant temperature with the aim of further reduction of PVT. The
dimensions and number of fuel rods and coolant holes, and the triangular pitch have
been changed and optimized. Different packing fractions for the new core design have
been used to conserve the number of fuel particles.
Thermal properties for the fuel
elements are calculated and incorporated into these analyses. The inlet temperature, mass
flow and bypass flow are optimized to limit the peak fuel temperature (PFT) within an
acceptable range.
Using both of these modifications together, the PVT is reduced to ~350 0C while
keeping the outlet temperature at 950 0C and maintaining the PFT within acceptable
limits. The vessel and fuel temperatures during low pressure conduction cooldown and high pressure conduction cooldown transients are found to be well below the design
limits.
The reliability and availability studies for coupled nuclear hydrogen production
processes based on the sulfur iodine thermochemical process and high temperature
electrolysis process have been accomplished. The fault tree models for both these
processes are developed. Using information obtained on system configuration,
component failure probability, component repair time and system operating modes and
conditions, the system reliability and availability are assessed. Required redundancies
are made to improve system reliability and to optimize the plant design for economic
performance. The failure rates and outage factors of both processes are found to be well
below the maximum acceptable range.
Advisors/Committee Members: Peddicord, Kenneth Lee (advisor), Adams, Marvin L. (committee member), Hartwig, Karl T. (committee member), Harvego, Edwin A. (committee member), Marlow, William H. (committee member).
Subjects/Keywords: Modular Helium Reactor; Thermal hydraulic; Vessel Temperature; Reliability
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APA (6th Edition):
Reza, S. M. M. (2009). Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1354
Chicago Manual of Style (16th Edition):
Reza, S M Mohsin. “Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 17, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1354.
MLA Handbook (7th Edition):
Reza, S M Mohsin. “Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes.” 2009. Web. 17 Jan 2021.
Vancouver:
Reza SMM. Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1354.
Council of Science Editors:
Reza SMM. Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1354
Penn State University
24.
Karriem, Veronica.
THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION.
Degree: 2016, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/cv43nw80h
► Nuclear reactor design incorporates the study and application of nuclear physics, nuclear thermal hydraulic and nuclear safety. Theoretical models and numerical methods implemented in computer…
(more)
▼ Nuclear reactor design incorporates the study and application of nuclear physics, nuclear
thermal hydraulic and nuclear safety. Theoretical models and numerical methods implemented in computer programs are utilized to analyze and design nuclear reactors. The focus of this PhD study's is the development of an advanced high-fidelity multi-physics code system to perform reactor core analysis for design and safety evaluations of research TRIGA-type reactors.
The fuel management and design code system TRIGSIMS was further developed to fulfill the function of a reactor design and analysis code system for the Pennsylvania State Breazeale Reactor (PSBR). TRIGSIMS, which is currently in use at the PSBR, is a fuel management tool, which incorporates the depletion code ORIGEN-S (part of SCALE system) and the Monte Carlo neutronics solver MCNP. The diffusion theory code ADMARC-H is used within TRIGSIMS to accelerate the MCNP calculations. It manages the data and fuel isotopic content and stores it for future burnup calculations.
The contribution of this work is the development of an improved version of TRIGSIMS, named TRIGSIMS-TH. TRIGSIMS-TH incorporates a
thermal hydraulic module based on the advanced sub-channel code COBRA-TF (CTF). CTF provides the temperature feedback needed in the multi-physics calculations as well as the
thermal hydraulics modeling capability of the reactor core. The temperature feedback model is using the CTF-provided local moderator and fuel temperatures for the cross-section modeling for ADMARC-H and MCNP calculations. To perform efficient critical control rod calculations, a methodology for applying a control rod position was implemented in TRIGSIMS-TH, making this code system a modeling and design tool for future core loadings.
The new TRIGSIMS-TH is a computer program that interlinks various other functional reactor analysis tools. It consists of the MCNP5, ADMARC-H, ORIGEN-S, and CTF. CTF was coupled with both MCNP and ADMARC-H to provide the heterogeneous temperature distribution throughout the core. Each of these codes is written in its own computer language performing its function and outputs a set of data. TRIGSIMS-TH provides an effective use and data manipulation and transfer between different codes. With the implementation of feedback and control- rod-position modeling methodologies, the TRIGSIMS-TH calculations are more accurate and in a better agreement with measured data.
The PSBR is unique in many ways and there are no “off-the-shelf” codes, which can model this design in its entirety. In particular, PSBR has an open core design, which is cooled by natural convection. Combining several codes into a unique system brings many challenges. It also requires substantial knowledge of both operation and core design of the PSBR. This reactor is in operation decades and there is a fair amount of studies and developments in both PSBR
thermal hydraulics and neutronics. Measured data is also available for various core loadings and can be used for validation activities. The previous studies and…
Advisors/Committee Members: Maria Nikolova Avramova, Dissertation Advisor/Co-Advisor.
Subjects/Keywords: TRIGA reactor; MCNP; COBRA-TF; Partially inserted control rods; PSBR; Thermal hydraulic and neutronic coupling methods; CTF; TRIGSIMS
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APA (6th Edition):
Karriem, V. (2016). THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/cv43nw80h
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karriem, Veronica. “THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION.” 2016. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/cv43nw80h.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karriem, Veronica. “THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION.” 2016. Web. 17 Jan 2021.
Vancouver:
Karriem V. THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/cv43nw80h.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karriem V. THE DEVELOPMENT OF A THERMAL HYDRAULIC FEEDBACK MECHANISM WITH A QUASI-FIXED POINT ITERATION SCHEME FOR CONTROL ROD POSITION MODELING FOR THE TRIGSIMS-TH APPLICATION. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/cv43nw80h
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Lacroix, Clément.
Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination.
Degree: Docteur es, Sciences de l'Ingénieur, 2020, Perpignan
URL: http://www.theses.fr/2020PERP0001
► L’osmose inverse est la technique de dessalement la plus utilisée actuellement, principalement pour sa faible consommation spécifique d’énergie. Les procédés d’osmose inverse alimentés par une…
(more)
▼ L’osmose inverse est la technique de dessalement la plus utilisée actuellement, principalement pour sa faible consommation spécifique d’énergie. Les procédés d’osmose inverse alimentés par une source d’énergie solaire se développent de plus en plus du fait de l’efficacité énergétique de ce procédé membranaire et de la disponibilité de la ressource solaire, particulièrement importante dans les zones à fort stress hydrique. Un procédé de dessalement thermo-hydraulique solaire est ici analysé et évalué avec pour objectif une production autonome d'eau douce à partir d’eaux saumâtres compatible avec les besoins d’un village décentralisé.Ce procédé innovant de dessalement par osmose inverse permet d'exploiter une source de chaleur basse température (50-80°C) convertie en énergie hydraulique par un cycle thermodynamique moteur dans lequel la détente d’un fluide de travail permet directement de pressuriser l’eau saumâtre à traiter. Une modélisation dynamique de ce procédé a été réalisée pour permettre une évaluation du procédé dont le fonctionnement cyclique est fortement dynamique. Une attention particulière a été portée sur le comportement dynamique du module membranaire, soumis à des variations cycliques de pression, dont le modèle dynamique d’osmose inverse qui a été validé expérimentalement. Le comportement du procédé global a ainsi été simulé et analysé sur quelques cycles, puis sur une journée entière avec des conditions d'ensoleillement différentes, pour évaluer l'impact des conditions opératoires variables, ainsi que de la salinité et de la température de l'eau sur la dynamique de fonctionnement du procédé et établir des stratégies de contrôle-commande pour maximiser ses performances. Une réflexion sur les zone d’implantations géographiques a également été menée. Ces simulations ont montré que ce procédé permet de produire de 450 à 750 litres d'eau douce par jour et par unité de surface du capteur solaire pour des salinités variant de 2 à 6 g.L-1, avec une consommation d’énergie spécifique de l'ordre de 6 kWhth.m-3 et pour un coût, estimé en première approximation à partir du coût d'un prototype actuellement en cours de développement, d’environ 8 m-3 d’eau produite.
Reverse osmosis is the most widely used desalination technique today, mainly because of its low specific energy consumption. Reverse osmosis processes powered by a solar energy source are more and more developed because of their energy efficiency and the solar resource availability, matching particularly with high water stress areas. In this framework, an innovative solar thermo-hydraulic desalination process is here developed. It is analyzed and evaluated with the aim of producing autonomously fresh water from brackish water compatible with the needs of a remote village.This innovative reverse osmosis desalination process exploits a low-grade temperature heat source (50-80°C), converted into hydraulic energy by a thermodynamic engine cycle in which the expansion of a working fluid directly pressurizes the brackish water. A dynamic modeling of this…
Advisors/Committee Members: Stitou, Driss (thesis director), Périer-Muzet, Maxime (thesis director).
Subjects/Keywords: Osmose Inverse; Cycle de puissance thermo-Hydraulique; Solaire thermique; Reverse osmosis; Thermo-Hydraulic power; Solar thermal; 620
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APA (6th Edition):
Lacroix, C. (2020). Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination. (Doctoral Dissertation). Perpignan. Retrieved from http://www.theses.fr/2020PERP0001
Chicago Manual of Style (16th Edition):
Lacroix, Clément. “Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination.” 2020. Doctoral Dissertation, Perpignan. Accessed January 17, 2021.
http://www.theses.fr/2020PERP0001.
MLA Handbook (7th Edition):
Lacroix, Clément. “Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination.” 2020. Web. 17 Jan 2021.
Vancouver:
Lacroix C. Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination. [Internet] [Doctoral dissertation]. Perpignan; 2020. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2020PERP0001.
Council of Science Editors:
Lacroix C. Procédé thermo-hydraulique solaire pour le dessalement par osmose inverse : Solar-driven thermo-hydraulic process for reverse osmosis desalination. [Doctoral Dissertation]. Perpignan; 2020. Available from: http://www.theses.fr/2020PERP0001
Univerzitet u Beogradu
26.
Jaćimovski, Darko R., 1977-.
Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice.
Degree: Tehnološko-metalurški fakultet, 2018, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:17299/bdef:Content/get
► Tehnološko inženjerstvo-Hemijsko inženjerstvo / Technological engineering- Chemical engineering
U ovom radu eksperimentalno je ispitivan diskontinualni granični sloj i analogije prenosa količine kretanja, toplote i mase…
(more)
▼ Tehnološko inženjerstvo-Hemijsko inženjerstvo /
Technological engineering- Chemical engineering
U ovom radu eksperimentalno je ispitivan
diskontinualni granični sloj i analogije prenosa količine kretanja,
toplote i mase u fluidizovanim i pakovanim slojevima i pri
hidrauličkom transportu sistema tečnost-čestice. Cilj ovog rada je
upravo povezivanje karakteristika graničnog sloja sa prenosom
količine kretanja, toplote i mase, sa akcentom na analogije između
ovih prenosa. Fenomenološkim pristupom ovoj problematici, daje se
doprinos koji bi olakšao teorijsko razmatranje višefaznih sistema
tečnost-čestice (pakovani sloj, fluidizovani sloj, vertikalni
transport), koji su izuzetno složeni. Za izvođenje eksperimentalnog
dela istraživanja u ovoj doktorskoj disertaciji korišćeni su
različiti sistemi: standardne kolone različitih prečnika sa
omotačem ili bez omotača, sa pakovanim, fluidizovanim i
transportnim sistemima u cilju dobijanja parametara za koeficijente
prenosa količine kretanja, mase i toplote i segmentirane kolone sa
fluidizovanim česticama u cilju dobijanja parametara na koje utiče
debljina graničnog sloja. Sva eksperimentalna merenja su izvršena u
širokom opsegu hidrodinamičkih uslova: brzina strujanja fluida,
veličina čestica čvrste faze i poroznosti slojeva. Kao rezultat
istraživanja razvijen je novi teorijski model za prenos mase i
toplote zasnovan na analizi graničnog sloja koji se u disperznom
sistemu formira od sudara do sudara čestica. Na osnovu modela
dobijena je debljina difuzionog i termičkog graničnog sloja,
izvedene su jednačine za korelisanje koeficijenata prelaza,
Sherwood-ovog i Nusselt-ovog broja i faktora prenosa mase i
toplote. Na osnovu uspostavljenog modela izvedena je jednačina za
određivanje maksimalne vrednosti koeficijenata prelaza toplote i
poroznosti sloja pri kojoj do nje dolazi. U ovom radu je
uspostavljena analogija prenosa količine kretanja, mase i toplote u
partikulativno fluidizovanim slojevima zasnovana na modelu
graničnog sloja. Postojeća analogija u fluidizovanom sloju, data na
osnovu normalizovanih vrednosti koeficijenta trenja čestice-fluid i
faktora prenosa mase proširena je na analogiju sva tri prenosa.
Dobijeni model je upotrebljen za definisanje faktora prenosa mase i
toplote pri minimalnoj fluidizaciji i transportu
čestica...
Advisors/Committee Members: Bošković-Vragolović, Nevenka. 1964-.
Subjects/Keywords: Discontinued concentration boundary layer; Discontinued
thermal boundary layer; Fluidized bed; Packed bed; Hydraulic
transport; Mass transfer; Heat transfer; Analogy
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jaćimovski, Darko R., 1. (2018). Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:17299/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jaćimovski, Darko R., 1977-. “Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice.” 2018. Thesis, Univerzitet u Beogradu. Accessed January 17, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:17299/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jaćimovski, Darko R., 1977-. “Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice.” 2018. Web. 17 Jan 2021.
Vancouver:
Jaćimovski, Darko R. 1. Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice. [Internet] [Thesis]. Univerzitet u Beogradu; 2018. [cited 2021 Jan 17].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:17299/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jaćimovski, Darko R. 1. Diskontinualni granični sloj i analogije prenosa u
pakovanim, fluidizovanim i transportnim sistemima
tečnost-čestice. [Thesis]. Univerzitet u Beogradu; 2018. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:17299/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Western Ontario
27.
Wang, Yunpeng.
The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump.
Degree: 2019, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/6526
► The laminar axisymmetric flow and heat transfer of a circular impinging jet and hydraulic jump on a solid surface is analyzed theoretically using boundary-layer and…
(more)
▼ The laminar axisymmetric flow and heat transfer of a circular impinging jet and hydraulic jump on a solid surface is analyzed theoretically using boundary-layer and thin-film approaches. Liquid jet impingement features many applications such as jet rinsing, jet cooling, liquid atomization and chemical reactors. The associated hydraulic jump dramatically affects the performance of the heat and mass transfer in such applications. In the current thesis, the effects of inertia, surface tension, surface rotation, gravity and heat transfer are comprehensively explored for impinging jet flow and the formation of hydraulic jump.
The boundary-layer heights and film thickness are found to diminish with inertia. The wall shear stress is found to decrease with radial distance for on a stationary impingement surface but can increase for a rotary surface for large rotation speeds. When the surface is in rotation, a maximum liquid thickness occurs, reflecting the competition between inertia and rotation effects. The location of the hydraulic jump is determined for both low- and high-viscosity liquids. For low-viscosity liquid, the location of the jump is determined subject to the thickness near the trailing edge under static condition, reflecting the importance of surface tension. For high-viscosity liquids, the jump coincides with a singularity caused by gravity in the thin-film equation when surface tension is neglected. Downstream of the hydraulic jump, the recent finding of a constant ‘jump Froude number’ is also justified.
The heat transfer analysis of impinging jet flow involves a two-way coupling due to the temperature-dependent viscosity and surface tension. To consider this non-linear coupling which is largely missing in the existing theoretical approaches, we develop a simple and iteration-free model, making exploring the influence of heat transfer on the flow field and the hydraulic jump feasible theoretically. Both the hydrodynamic and thermal boundary layers are found to decrease with a higher heat input at the solid surface. Enhanced heating is also found to push the hydraulic jump in the downstream direction. The Marangoni stress causes the hydraulic jump to occur earlier. The hydraulic jump leads to shock-type drops in the Nusselt number, confirming previous findings in the literature.
Subjects/Keywords: impinging jet; thermal fluid; hydraulic jump; free-surface flow; rotating flow; two-way coupling; Applied Mechanics
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APA (6th Edition):
Wang, Y. (2019). The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Yunpeng. “The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump.” 2019. Thesis, University of Western Ontario. Accessed January 17, 2021.
https://ir.lib.uwo.ca/etd/6526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Yunpeng. “The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump.” 2019. Web. 17 Jan 2021.
Vancouver:
Wang Y. The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump. [Internet] [Thesis]. University of Western Ontario; 2019. [cited 2021 Jan 17].
Available from: https://ir.lib.uwo.ca/etd/6526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang Y. The Hydrodynamics and Heat Transfer of Impinging Jet Flow and Circular Hydraulic Jump. [Thesis]. University of Western Ontario; 2019. Available from: https://ir.lib.uwo.ca/etd/6526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
28.
Yan, Yizhou.
Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors.
Degree: PhD, Nuclear Engineering, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/29660
► Motivated by recent developments in the field of Computational Fluid Dynamics (CFD) and recognizing the limitations on computing power, this dissertation is aimed at combining…
(more)
▼ Motivated by recent developments in the field of Computational Fluid Dynamics (CFD) and recognizing the limitations on computing power, this dissertation is aimed
at combining the desirable features of system codes and CFD codes, thus elevating the nuclear reactor
thermal hydraulics simulation capabilities to address problems
that cannot be addressed with existing computational tools. The goal is achieved by first implementing improved porous media models in a commercial CFD code
and then by judicious coupling of the CFD code with a coarse nuclear system code.
Computationally intensive CFD is used in spatial domains where the flow is expected to be three-dimensional; whereas a system code is used to simulate regions where the flow is expected to be one-dimensional or to simulate components such as pumps, etc.
Work accomplished in this dissertation can be divided into the following five parts.
??? Test a commercial CFD code, FLUENT, by solving a nuclear-specific benchmark problem. Extend the porous media turbulence model in the CFD code using User-Defined Functions (UDFs).
??? Demonstrate the porous media simulating capability by a nuclear system using a combined CFD model of clear flow and porous media flow(for core region).
??? Propose a hybrid approach to couple a CFD code with a nuclear system code. Develop the coupled CFD???system-code approach. Verify the coupled code using a simple flow in a network of pipes.
??? Test the large scale application of the coupled CFD???system-code by modeling the Nuclear Steam Supply System (NSSS) of a Pressurized Water Reactor (PWR).
??? Demonstrate the potential of the coupled CFD???system-code for next generation reactors by applying it to a Gas Turbine - Modular Helium Reactor (GTMHR).
Part 1 is accomplished by implementing a modified k ??? ?? turbulence model for porous media in a CFD code (FLUENT) using UDFs. Transverse flow through porous media is simulated with the extended CFD code. Results are compared with experimental data.
In the second part of this thesis, the International Standard Problem (ISP) No. 43, rapid boron-dilution experiment, is simulated using FLUENT to verify capability to model nuclear systems. Australian Replacement Research Reactor (RRR) is modeled to demonstrate application of CFD, with porous media model for the reactor core. The parameters for the porous media model are obtained through a series of assembly level CFD simulations.
RELAP5-3D is introduced in Part 3 as the nuclear system code for coupled CFD???System-code development. UDF feature of FLUENT is used to develop the interface for this coupling effort. This innovative coupling approach is verified by comparing the results of a simple transient flow problem obtained using the coupled codes with the results from the CFD-only simulation and the system-code-only
simulation.
Part 4 is the first large scale application of the coupled CFD???system-code. A simplified PWR NSSS is modeled by the coupled CFD???system-code approach developed
in Part 3. Time-dependent three-dimensional…
Advisors/Committee Members: Uddin, Rizwan (advisor), Jones, Barclay G. (committee member), Stubbins, James F. (committee member), Sobh, Nahil A. (committee member).
Subjects/Keywords: GEN IV Nuclear Reactor; Thermal Hydraulic; Computational Fluid Dynamics
(CFD); RELAP; Coupled Simulation; Porous Media Model; Generation IV (GEN IV)
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APA ·
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APA (6th Edition):
Yan, Y. (2012). Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29660
Chicago Manual of Style (16th Edition):
Yan, Yizhou. “Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 17, 2021.
http://hdl.handle.net/2142/29660.
MLA Handbook (7th Edition):
Yan, Yizhou. “Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors.” 2012. Web. 17 Jan 2021.
Vancouver:
Yan Y. Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/2142/29660.
Council of Science Editors:
Yan Y. Development of a coupled CFD???system-code capability (with a modified porous media model) and its applications to simulate current and next generation reactors. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29660
University of New Mexico
29.
Collins, Adam.
Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat.
Degree: UNM Biology Department, 2015, University of New Mexico
URL: https://digitalrepository.unm.edu/biol_etds/17
► Plant respiration (R) is generally well-coupled with temperature and in the absence of thermal acclimation, respiration is expected to increase as climate change brings…
(more)
▼ Plant respiration (R) is generally well-coupled with temperature and in the absence of
thermal acclimation, respiration is expected to increase as climate change brings higher temperatures. Increased drought is also predicted for future climate, which could drive respiration higher if the carbon (C) cost to maintain tissues (Rm) or grow increases, or lower if substrate or other factors become limiting. We examined the effects of temperature and drought on R as well as photosynthesis, growth, and carbohydrate storage of mature individuals of two co-dominant tree species. Three mature, in-situ piñon (Pinus edulis) and juniper (Juniperus monosperma) trees were assigned to each of the following treatments: +4.8 °C; 45% reduced precipitation; a combination of both (heat + drought); along with ambient control and treatment controls. Rm measured prior to foliar and twig growth was far more sensitive to drought in piñon, and heat in juniper. Total respiration (Rt, R not partitioned) acclimated to temperature in piñon such that elevated temperature had minimal impacts on Rt; however, juniper exhibited higher Rt with elevated temperature, thus juniper did not display any
thermal acclimation. Rt in both species was weakly associated with temperature, but strongly correlated with pre-dawn water potential, photosynthetic assimilation (A) rates, and in piñon, foliar carbohydrates. For both species, heat caused far more days where A-R was negative than did drought. The consequences of drought alone and heat alone in piñon included higher Rt per unit growth, indicating that each abiotic stress forces a greater allocation of Rt to maintenance costs, and both drought + heat in combination results in far fewer days that foliar carbohydrates could sustain R in both species. Notably, the much higher A and R of juniper than piñon is consistent with predicted superior carbon budget regulation of juniper than piñon during drought; however, junipers lack of temperature acclimation in contrast to piñon suggests climate warming may have a greater deleterious impact on juniper carbon balance than piñon.
Advisors/Committee Members: Pockman, William, Litvak, Marcy, McDowell, Nathan.
Subjects/Keywords: respiration; drought; heat; Q10; thermal acclimation; global climate change; isohydric; anisohydric; tree mortality; hydraulic failure; carbon starvation; Biology
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APA (6th Edition):
Collins, A. (2015). Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat. (Masters Thesis). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/biol_etds/17
Chicago Manual of Style (16th Edition):
Collins, Adam. “Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat.” 2015. Masters Thesis, University of New Mexico. Accessed January 17, 2021.
https://digitalrepository.unm.edu/biol_etds/17.
MLA Handbook (7th Edition):
Collins, Adam. “Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat.” 2015. Web. 17 Jan 2021.
Vancouver:
Collins A. Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat. [Internet] [Masters thesis]. University of New Mexico; 2015. [cited 2021 Jan 17].
Available from: https://digitalrepository.unm.edu/biol_etds/17.
Council of Science Editors:
Collins A. Foliar respiration and carbon dynamics of mature piñon and juniper trees in response to experimental drought and heat. [Masters Thesis]. University of New Mexico; 2015. Available from: https://digitalrepository.unm.edu/biol_etds/17
Louisiana State University
30.
Grau Sacoto, Francisco Javier.
Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques.
Degree: MSCE, Civil and Environmental Engineering, 2014, Louisiana State University
URL: etd-04142014-155834
;
https://digitalcommons.lsu.edu/gradschool_theses/1024
► Biomass, the organic material derived from plants or animals in a biological process, has rapidly become a topic of worldwide interest. The need to find…
(more)
▼ Biomass, the organic material derived from plants or animals in a biological process, has rapidly become a topic of worldwide interest. The need to find new types of renewable energy sources has led to the use of natural materials as an economic, sustainable and environmental alternative. Biomass can be used to produce biofuel after a conversion process. The combustion of biomass matter –which is mainly produced in industrial plants- becomes biomass ash, which contains macronutrients and micronutrients. Currently, the recycling potential is wasted and most of the biomass ash is dumped without control or just disposed in landfills. The main objective of this research is to provide an environmental solution recycling the biomass ash and reducing the waste. Thus, biomass ashes from two kinds of materials were selected and tested in the laboratory. Wood ash is used in this study since wood is currently one of the largest biomass energy sources that has been applied in engineering in construction of roads, landfills and concrete mixtures. Also, sugarcane bagasse ash was used in this study because sugarcane is the most abundant crop in Louisiana. Bagasse is the residue matter, mostly consisting of the dry fibrous mass remaining after the juice is extracted. Therefore, wood and sugarcane bagasse ashes’ physical and chemical properties were investigated for their characterization such as particle size distribution –sieve and hydrometer, specific gravity, pH, microscope examination using SEM and elemental analysis using EDS. Also, geotechnical tests were conducted such as hydraulic conductivity, one-dimensional consolidation, shear wave velocity using bender elements and thermal conductivity. Samples containing 100% of Ottawa 20-30 sand, wood ash and sugarcane bagasse ash were tested first. Later, mixtures of sand with 2~10% ash were tested in order to compare and evaluate the behavior of those biomass ashes when mixing them with a non-cohesive soil.
Subjects/Keywords: biomass; shear wave velocity; consolidation; hydraulic conductivity; characterization; sugarcane bagasse ash; wood ash; biomass ash; thermal conductivity
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APA ·
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Manager
APA (6th Edition):
Grau Sacoto, F. J. (2014). Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques. (Masters Thesis). Louisiana State University. Retrieved from etd-04142014-155834 ; https://digitalcommons.lsu.edu/gradschool_theses/1024
Chicago Manual of Style (16th Edition):
Grau Sacoto, Francisco Javier. “Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques.” 2014. Masters Thesis, Louisiana State University. Accessed January 17, 2021.
etd-04142014-155834 ; https://digitalcommons.lsu.edu/gradschool_theses/1024.
MLA Handbook (7th Edition):
Grau Sacoto, Francisco Javier. “Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques.” 2014. Web. 17 Jan 2021.
Vancouver:
Grau Sacoto FJ. Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques. [Internet] [Masters thesis]. Louisiana State University; 2014. [cited 2021 Jan 17].
Available from: etd-04142014-155834 ; https://digitalcommons.lsu.edu/gradschool_theses/1024.
Council of Science Editors:
Grau Sacoto FJ. Engineering Behavior and Characterization of Biomass Ashes using Geotechnical Measurement Techniques. [Masters Thesis]. Louisiana State University; 2014. Available from: etd-04142014-155834 ; https://digitalcommons.lsu.edu/gradschool_theses/1024
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Open Access Theses and Dissertations