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Oregon State University
1.
Porter, Mark L.
Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling.
Degree: PhD, Water Resources Engineering, 2008, Oregon State University
URL: http://hdl.handle.net/1957/9029 
► Recent advances in imaging technology and numerical modeling have greatly enhanced pore-scale investigations of multiphase flow and transport in porous media. It is now feasible…
(more)
▼ Recent advances in imaging technology and numerical modeling have greatly enhanced pore-scale investigations of multiphase
flow and transport in porous media. It is now feasible to obtain high resolution 3-dimensional pore-scale data, and numerical methods such as the lattice-
Boltzmann (LB) technique have been developed specifically for simulating such phenomena.
Traditional macro-scale multiphase
flow models rely heavily on empirical relationships. For example, the interaction between fluids at their interfaces is accounted for indirectly through
the empirical relative permeability relationship. Nevertheless, it has recently been hypothesized that the single most important variable missing from current macro-scale models is the measure of interfacial dynamics between fluids within the pores. Furthermore, the empirical capillary pressure-saturation relationship used in macro-scale multiphase
flow simulators has been shown to be a function of interfacial area per volume. This study focuses on (1) the measurement and modeling of the capillary pressure-saturation relationship; and (2) the characterization of
the fluid-fluid interfacial area per volume as a function of saturation. The study synthesizes experimental results derived from pore-scale computerized micro-tomographic (CMT) images with LB simulations. An image analysis algorithm for quantifying fluid-fluid interfacial area per volume from experimental CMT and simulation images was developed and verified. The experimental results were shown to be in good agreement with values reported in the literature.
Furthermore, the capillary ressure-saturation curves were used to validate a recently proposed macro-scale interfacial area model. New LB simulations of drainage and imbibition for an air-water system were developed, in which the full geometry from the experimental system was used to define the lattice. This allowed for the direct comparison of experimental and simulated
phase distributions within the pores. LB simulations showed excellent agreement with experimental results, considering no optimization or calibration to the data was required. Collectively, results show that there is a complex functional relationship between capillary pressure, saturation and
interfacial area that provides insights into multiphase
flow and transport processes that can not be obtained from the capillary pressure-saturation relationship alone.
Advisors/Committee Members: Wildenschild, Dorthe (advisor), Schaap, Marcel G (committee member).
Subjects/Keywords: Multi-phase flow; Multiphase flow
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APA (6th Edition):
Porter, M. L. (2008). Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/9029
Chicago Manual of Style (16th Edition):
Porter, Mark L. “Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling.” 2008. Doctoral Dissertation, Oregon State University. Accessed March 04, 2021.
http://hdl.handle.net/1957/9029.
MLA Handbook (7th Edition):
Porter, Mark L. “Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling.” 2008. Web. 04 Mar 2021.
Vancouver:
Porter ML. Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling. [Internet] [Doctoral dissertation]. Oregon State University; 2008. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1957/9029.
Council of Science Editors:
Porter ML. Investigating capillary pressure and interfacial area for multiphase flow in porous media using pore-scale imaging and lattice-Boltzmann modeling. [Doctoral Dissertation]. Oregon State University; 2008. Available from: http://hdl.handle.net/1957/9029
University of Wollongong
2.
Liu, Bin.
Modelling of CO2 release from high pressure pipelines.
Degree: PhD, 2016, University of Wollongong
URL: 0913
MECHANICAL
ENGINEERING
;
https://ro.uow.edu.au/theses/4950
► Carbon Capture and Storage (CCS) is widely seen as an effective technique to reduce what are perceived to be excessive concentrations of Carbon Dioxide…
(more)
▼ Carbon Capture and Storage (CCS) is widely seen as an effective technique to reduce what are perceived to be excessive concentrations of Carbon Dioxide (CO2) in the atmosphere. In the CCS chain, transportation of CO2 through high-pressure pipelines constitutes an important link. Although CO2 pipelines are generally very safe, an unplanned release of CO2 from a pipeline presents a potential risk to human and animal populations as well as the environment. Therefore, to facilitate the risk assessment, it is necessary to gain a better understanding of CO2 releases from high-pressure pipelines, including the prediction of depressurisation of the pipe flow, the near-field atmospheric expansion and the far-field atmospheric dispersion.
Subjects/Keywords: CFD; CCS; multi-phase flow
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APA (6th Edition):
Liu, B. (2016). Modelling of CO2 release from high pressure pipelines. (Doctoral Dissertation). University of Wollongong. Retrieved from 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4950
Chicago Manual of Style (16th Edition):
Liu, Bin. “Modelling of CO2 release from high pressure pipelines.” 2016. Doctoral Dissertation, University of Wollongong. Accessed March 04, 2021.
0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4950.
MLA Handbook (7th Edition):
Liu, Bin. “Modelling of CO2 release from high pressure pipelines.” 2016. Web. 04 Mar 2021.
Vancouver:
Liu B. Modelling of CO2 release from high pressure pipelines. [Internet] [Doctoral dissertation]. University of Wollongong; 2016. [cited 2021 Mar 04].
Available from: 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4950.
Council of Science Editors:
Liu B. Modelling of CO2 release from high pressure pipelines. [Doctoral Dissertation]. University of Wollongong; 2016. Available from: 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4950
3.
Ali, Imad.
CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS.
Degree: PhD, 2017, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/cfd-prediction-of-stratified-and-intermittent-gasliquid-twophase-turbulent-pipe-flow-using-rans(4fa69a04-51b9-4b5e-8bef-76cc93135407).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728155
► The transport of multi-phase flow in pipelines can be met in a wide range of industrial applications, including the oil and gas industry, showing great…
(more)
▼ The transport of multi-phase flow in pipelines can be met in a wide range of industrial applications, including the oil and gas industry, showing great savings in developments. In addition, as the exploration of new fields in oil and gas expands to harsh environments, such as ocean or polar, the multi-phase flow transport sometimes becomes the only feasible option. The important features of such multi-phase flow applications include flow regimes, pressure drop and liquid holdup. The precise estimation of these parameters has significant technical and economical impacts on the design and operation of an oil and gas pipelines. Many prediction correlations and methods have been developed; computational fluid dynamics (CFD) being one of them. This type of modelling approach has many advantages over the conventional approaches such as its ability to solve 3D transient problems; offering access to a wealth of information which with conventional techniques is extremely difficult to obtain. Therefore, interest in applying CFD for multi-phase flow transport in pipelines has been on the rise. This thesis is aimed at presenting CFD simulations based on the use of the Volume of Fluid model (VOF) approach for various conditions of gas-liquid turbulent flow in a horizontal circular pipe. In the current VOF formulation in addition to the secondary phase transport equation, a geometric reconstruction technique based on a piecewise-linear interface construction approach is used for reconstructing the interface. A number of multi-phase studies using different turbulence models to the current one have recently appeared in the open literature for simple flow geometries such as rectangular channels. However, most of them assume specific boundary conditions (such as fully-separated phases for stratified flows, the use of square wave at the inlet to represent slug flow or imposing an interfacial disturbance to initiate slugging). These require case-by-case empirical information such as, interfacial roughness for stratified- or slug frequency for intermittent-flow. However, most of them have not presented any detailed validation of their results. The former two points are very crucial for the design of transport pipelines as a pre-knowledge of the operative flow regime and empirical information are not available at the design stage. The predictive accuracy of the present simulations is tested against most common mechanistic approaches and detailed measurements of stratified two-phase flow in a horizontal pipe of Strand (1993) and have been found to be in reasonable quantitative agreement. For the intermittent flow type cases, the numerical results are qualitatively compared against experiments in a horizontal pipe of Al-alweet (2008). The computed flow data of intermittent flow type are further tested against some empirical and mechanistic correlations; the numerical results are qualitatively in a reasonable agreement. Gas compressibility effects on the simulations of slug flow are also explored and are found to bring about some positive…
Subjects/Keywords: 621.8; Multi-phase Flow; Pipelines; CFD; VOF
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APA ·
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APA (6th Edition):
Ali, I. (2017). CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/cfd-prediction-of-stratified-and-intermittent-gasliquid-twophase-turbulent-pipe-flow-using-rans(4fa69a04-51b9-4b5e-8bef-76cc93135407).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728155
Chicago Manual of Style (16th Edition):
Ali, Imad. “CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS.” 2017. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/cfd-prediction-of-stratified-and-intermittent-gasliquid-twophase-turbulent-pipe-flow-using-rans(4fa69a04-51b9-4b5e-8bef-76cc93135407).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728155.
MLA Handbook (7th Edition):
Ali, Imad. “CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS.” 2017. Web. 04 Mar 2021.
Vancouver:
Ali I. CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Mar 04].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/cfd-prediction-of-stratified-and-intermittent-gasliquid-twophase-turbulent-pipe-flow-using-rans(4fa69a04-51b9-4b5e-8bef-76cc93135407).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728155.
Council of Science Editors:
Ali I. CFD prediction of stratified and intermittent gas-liquid two-phase turbulent pipe flow using RANS. [Doctoral Dissertation]. University of Manchester; 2017. Available from: https://www.research.manchester.ac.uk/portal/en/theses/cfd-prediction-of-stratified-and-intermittent-gasliquid-twophase-turbulent-pipe-flow-using-rans(4fa69a04-51b9-4b5e-8bef-76cc93135407).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728155
University of Gothenburg / Göteborgs Universitet
4.
Einarsson, Jonas.
Angular dynamics of small particles in fluids.
Degree: 2015, University of Gothenburg / Göteborgs Universitet
URL: http://hdl.handle.net/2077/40830
► This thesis concerns the angular motion of small particles suspended in fluid flows. A small particle experiences a hydrodynamic torque due to the local fluid…
(more)
▼ This thesis concerns the angular motion of small particles suspended in fluid flows. A small particle experiences a hydrodynamic torque due to the local fluid velocity, and this torque leads to rotational motion. When inertial effects are negligible the torque on an ellipsoidal particle is given by
Jeffery's theory [Jeffery, G. B. Proc. R. Soc. Lond. A 102, 161–179 (1922)].
In this thesis and the appended papers I describe three studies that all relate to this well-known result.
First, we derive an effective equation of motion for the orientation of a spheroid in a simple shear flow, valid for small values of the shear Reynolds number {Re}s=sa2/ν, where s is the shear rate, a the particle size and ν the kinematic viscosity of the suspending fluid. In absence of inertia the equation of motion has infinitely many periodic solutions, the 'Jeffery orbits'. We show how this degeneracy is lifted by the effects of inertia.
Second, we describe experimental observations of the orientational dynamics of asymmetric particles advected in a microchannel. We record several trajectories with each particle by resetting the initial condition with an optical trap. We find that the dynamics depend sensitively on both particle shape and initial conditions. This confirms earlier theoretical results, which are also described in this thesis.
Third, we discuss the angular dynamics of axisymmetric particles in turbulent and random flow. In these flows the statistical averages of the angular dynamical quantities depend crucially on the intricate correlations between the particle orientation, angular velocity, and the flow vorticity relative to the principal straining directions of the fluid flow. We illustrate this by direct numerical simulation, experimental measurements and statistical model calculations.
Finally, this thesis contains an introduction to the field aimed at new students, as well as an accessible popular science introduction to low Reynolds particle dynamics.
Subjects/Keywords: Fluid mechanics; Particle dynamics; Multi-phase flow
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APA (6th Edition):
Einarsson, J. (2015). Angular dynamics of small particles in fluids. (Thesis). University of Gothenburg / Göteborgs Universitet. Retrieved from http://hdl.handle.net/2077/40830
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):
Einarsson, Jonas. “Angular dynamics of small particles in fluids.” 2015. Thesis, University of Gothenburg / Göteborgs Universitet. Accessed March 04, 2021.
http://hdl.handle.net/2077/40830.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Einarsson, Jonas. “Angular dynamics of small particles in fluids.” 2015. Web. 04 Mar 2021.
Vancouver:
Einarsson J. Angular dynamics of small particles in fluids. [Internet] [Thesis]. University of Gothenburg / Göteborgs Universitet; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2077/40830.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Einarsson J. Angular dynamics of small particles in fluids. [Thesis]. University of Gothenburg / Göteborgs Universitet; 2015. Available from: http://hdl.handle.net/2077/40830
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Pal, Botond (author).
Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:57fecdc3-4987-439c-a6fc-f2cf6a1d70c3
► The conducted study investigates the potential of a newly released multi-phase solver to simulate atomization in liquid rocket injectors. The "VOF-to-DPM" solver was used to…
(more)
▼ The conducted study investigates the potential of a newly released multi-phase solver to simulate atomization in liquid rocket injectors. The "VOF-to-DPM" solver was used to simulate primary and secondary atomization in an air-blast atomizer with a coaxial injector-like geometry. The solver uses a hybrid Eulerian/Eulerian-Lagrangian formulation with a geometric transition criteria between the two models. The conducted study assumed isothermal, non-reacting flow at room temperature. The primary focus was predicting Sauter Mean Diameter and droplet velocity data at a sampling plane downstream of the injection site. The results showed that the solver is able to produce the expected data and to predict trends similar to those found in experimental measurements. The accuracy of the produced droplet diameters was roughly a factor 2 off compared to experiment. This is attributed to mesh resolution. Measurements were obtained via a cooperative agreement between TU Delft and The University of Sydney. It was concluded that the solver has the potential to predict atomization at a reasonable computational cost, but further study is needed to confirm its full capabilities.
Aerospace Engineering
Advisors/Committee Members: Zandbergen, Barry (mentor), Roekaerts, Dirk (mentor), Cervone, Angelo (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Atomization; Multi-phase flow; CFD; Injector
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Pal, B. (. (2019). Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:57fecdc3-4987-439c-a6fc-f2cf6a1d70c3
Chicago Manual of Style (16th Edition):
Pal, Botond (author). “Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver.” 2019. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:57fecdc3-4987-439c-a6fc-f2cf6a1d70c3.
MLA Handbook (7th Edition):
Pal, Botond (author). “Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver.” 2019. Web. 04 Mar 2021.
Vancouver:
Pal B(. Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:57fecdc3-4987-439c-a6fc-f2cf6a1d70c3.
Council of Science Editors:
Pal B(. Numerical Investigation of Spray Formation in Air-Blast Atomizers: Numerical study of air-blast atomization using a hybrid volume of fluid/discrete phase solver. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:57fecdc3-4987-439c-a6fc-f2cf6a1d70c3
University of Manchester
6.
Ali, Imad Taher Masaoud.
CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS.
Degree: 2017, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306852
► The transport of multi-phase flow in pipelines can be met in a wide range of industrial applications, including the oil and gas industry, showing great…
(more)
▼ The transport of
multi-
phase flow in pipelines can
be met in a wide range of industrial applications, including the
oil and gas industry, showing great savings in developments. In
addition, as the exploration of new fields in oil and gas expands
to harsh environments, such as ocean or polar, the
multi-
phase flow
transport sometimes becomes the only feasible option. The important
features of such
multi-
phase flow applications include
flow
regimes, pressure drop and liquid holdup. The precise estimation of
these parameters has significant technical and economical impacts
on the design and operation of an oil and gas pipelines. Many
prediction correlations and methods have been developed;
computational fluid dynamics (CFD) being one of them. This type of
modelling approach has many advantages over the conventional
approaches such as its ability to solve 3D transient problems;
offering access to a wealth of information which with conventional
techniques is extremely difficult to obtain. Therefore, interest in
applying CFD for
multi-
phase flow transport in pipelines has been
on the rise.This thesis is aimed at presenting CFD simulations
based on the use of the Volume of Fluid model (VOF) approach for
various conditions of gas-liquid turbulent
flow in a horizontal
circular pipe. In the current VOF formulation in addition to the
secondary
phase transport equation, a geometric reconstruction
technique based on a piecewise-linear interface construction
approach is used for reconstructing the interface.A number of
multi-
phase studies using different turbulence models to the
current one have recently appeared in the open literature for
simple
flow geometries such as rectangular channels. However, most
of them assume specific boundary conditions (such as
fully-separated phases for stratified flows, the use of square wave
at the inlet to represent slug
flow or imposing an interfacial
disturbance to initiate slugging). These require case-by-case
empirical information such as, interfacial roughness for
stratified- or slug frequency for intermittent-
flow. However, most
of them have not presented any detailed validation of their
results. The former two points are very crucial for the design of
transport pipelines as a pre-knowledge of the operative
flow regime
and empirical information are not available at the design stage.The
predictive accuracy of the present simulations is tested against
most common mechanistic approaches and detailed measurements of
stratified two-
phase flow in a horizontal pipe of Strand (1993) and
have been found to be in reasonable quantitative agreement. For the
intermittent
flow type cases, the numerical results are
qualitatively compared against experiments in a horizontal pipe of
Al-alweet (2008). The computed
flow data of intermittent
flow type
are further tested against some empirical and mechanistic
correlations; the numerical results are qualitatively in a
reasonable agreement. Gas compressibility effects on the
simulations of slug
flow are also explored and are found to bring
about some positive…
Advisors/Committee Members: Craft, Timothy.
Subjects/Keywords: Multi-phase Flow; Pipelines; CFD; VOF
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ali, I. T. M. (2017). CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306852
Chicago Manual of Style (16th Edition):
Ali, Imad Taher Masaoud. “CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS.” 2017. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306852.
MLA Handbook (7th Edition):
Ali, Imad Taher Masaoud. “CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS.” 2017. Web. 04 Mar 2021.
Vancouver:
Ali ITM. CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Mar 04].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306852.
Council of Science Editors:
Ali ITM. CFD Prediction of Stratified and Intermittent Gas-Liquid
Two-Phase Turbulent Pipe Flow Using RANS. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306852
Texas A&M University
7.
Alarbi, Nasraldin Abdulslam A.
Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells.
Degree: MS, Petroleum Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9786
► Hydraulic fracturing has recently been the completion of choice for most tight gas bearing formations. It has proven successful to produce these formations in a…
(more)
▼ Hydraulic fracturing has recently been the completion of choice for most tight gas bearing formations. It has proven successful to produce these formations in a commercial manner. However, some considerations have to be taken into account to design an optimum stimulation treatment that leads to the maximum possible productivity. These considerations include, but not limited to, non-Darcy
flow and multiphase
flow effects inside the fracture. These effects reduce the fracture conductivity significantly. Failing to account for that results in overestimating the deliverability of the well and, consequently, to designing a fracture treatment that is not optimum.
In this work a thorough investigation of non-Darcy
flow and
multi-
phase flow effects on the productivity of hydraulically fractured wells is conducted and an optimum fracture design is proposed for a tight gas formation in south Texas using the Unified Fracture Design (UFD) Technique to compensate for the mentioned effects by calculating the effective fracture permeability in an iterative way. Incorporating non-Darcy effects results in an optimum fracture that is shorter and wider than the fracture when only Darcy calculations are considered. That leads to a loss of production of 5, 18 percent due to dry and multiphase non-Darcy
flow effects respectively. A comparison between the UFD and 3D simulators is also done to point out the differences in terms of methodology and results. Since UFD incorporated the maximum dimensionless productivity index in the fracture dimensions design, unlike 3D simulators, it can be concluded that using UFD to design the fracture treatment and then use the most important fracture parameters outputs (half length and CfDopt) as inputs in the simulators is a recommended approach.
Advisors/Committee Members: Valko, Peter (advisor), Falcone, Gioia (committee member), Sun, Yuefeng (committee member).
Subjects/Keywords: non-darcy flow; multi-phase flow; hydraulically fractured wells
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Alarbi, N. A. A. (2011). Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9786
Chicago Manual of Style (16th Edition):
Alarbi, Nasraldin Abdulslam A. “Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells.” 2011. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9786.
MLA Handbook (7th Edition):
Alarbi, Nasraldin Abdulslam A. “Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells.” 2011. Web. 04 Mar 2021.
Vancouver:
Alarbi NAA. Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9786.
Council of Science Editors:
Alarbi NAA. Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9786
Curtin University of Technology
8.
Nadim, Nima.
Fluid and thermal behaviour of multi-phase flow through curved ducts
.
Degree: 2012, Curtin University of Technology
URL: http://hdl.handle.net/20.500.11937/794
► Fluid flow through curved ducts is influenced by the centrifugal action arising from duct curvature and has behaviour uniquely different to fluid flow through straight…
(more)
▼ Fluid flow through curved ducts is influenced by the centrifugal action arising from duct curvature and has behaviour uniquely different to fluid flow through straight ducts. In such flows, centrifugal forces induce secondary flow vortices and produce spiralling fluid motion within curved ducts. Secondary flow promotes fluid mixing with intrinsic potential for thermal enhancement and, exhibits possibility of fluid instability and additional secondary vortices under certain flow conditions. Reviewing published numerical and experimental work, this thesis discusses the current knowledge-base on secondary flow in curved ducts and, identifies the deficiencies in analyses and fundamental understanding. It then presents an extensive research study capturing advanced aspects of secondary flow behaviour in single and two-phase fluid flow through curved channels of several practical geometries and the associated wall heat transfer processes.As a key contribution to the field and overcoming current limitations, this research study develops a new three-dimensional numerical model for single-phase fluid flow in curved ducts incorporating vortex structure (helicity) approach and a curvilinear mesh system. The model is validated against the published data to ascertain modelling accuracy. Considering rectangular, elliptical and circular ducts, the flow patterns and thermal characteristics are obtained for a range of duct aspect ratios, flow rates and wall heat fluxes. Results are analysed for parametric influences and construed for clearer physical understanding of the flow mechanics involved. The study formulates two analytical techniques whereby secondary vortex detection is integrated into the computational process with unprecedented accuracy and reliability. The vortex inception at flow instability is carefully examined with respect to the duct aspect ratio, duct geometry and flow rate. An entropy-based thermal optimisation technique is developed for fluid flow through curved ducts.Extending the single-phase model, novel simulations are developed to investigate the multiphase flow in heated curved ducts. The variants of these models are separately formulated to examine the immiscible fluid mixture flow and the two-phase flow boiling situations in heated curved ducts. These advanced curved duct flow simulation models are validated against the available data. Along with physical interpretations, the predicted results are used to appraise the parametric influences on phase and void fraction distribution, unique flow features and thermal characteristics. A channel flow optimisation method based on thermal and viscous fluid irreversibilities is proposed and tested with a view to develop a practical design tool.
Subjects/Keywords: single-phase fluid flow;
curved ducts;
Fluid and thermal behaviour;
current limitations;
multi-phase flow
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APA (6th Edition):
Nadim, N. (2012). Fluid and thermal behaviour of multi-phase flow through curved ducts
. (Thesis). Curtin University of Technology. Retrieved from http://hdl.handle.net/20.500.11937/794
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):
Nadim, Nima. “Fluid and thermal behaviour of multi-phase flow through curved ducts
.” 2012. Thesis, Curtin University of Technology. Accessed March 04, 2021.
http://hdl.handle.net/20.500.11937/794.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nadim, Nima. “Fluid and thermal behaviour of multi-phase flow through curved ducts
.” 2012. Web. 04 Mar 2021.
Vancouver:
Nadim N. Fluid and thermal behaviour of multi-phase flow through curved ducts
. [Internet] [Thesis]. Curtin University of Technology; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/20.500.11937/794.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nadim N. Fluid and thermal behaviour of multi-phase flow through curved ducts
. [Thesis]. Curtin University of Technology; 2012. Available from: http://hdl.handle.net/20.500.11937/794
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
9.
Zaepffel, Didier.
Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows.
Degree: Docteur es, Mécanique, génie mécanique, 2011, Université de Grenoble
URL: http://www.theses.fr/2011GRENI070
► Cette thèse porte sur l'amélioration de la modélisation des écoulements à bulles, et plus particulièrement des écoule- ments bouillants, dont la compréhension et la prédiction…
(more)
▼ Cette thèse porte sur l'amélioration de la modélisation des écoulements à bulles, et plus particulièrement des écoule- ments bouillants, dont la compréhension et la prédiction est essentielle pour de nombreuses applications industrielles. L'axe de recherche choisi ici est la prise en compte du caractère polydisperse de la population de bulles, autrement dit du fait que toutes les bulles n'aient ni la même taille, ni la même vitesse. Divers mécanismes peuvent être cités pour expliquer l'existence de la variété de tailles de bulles ; dans notre cas on peut principalement citer la coalescence et la fragmentation de bulles, la cinématique de changement de phase ou encore la compressibilité du gaz à l'intérieur des bulles. De cette polydispersion en taille découle également une polydispersion en vitesse, puisqu'il est bien connu que la vitesse de déplacement d'une bulle est fonction de sa taille. Un modèle moyenné spécialement adapté aux écoulements à phase dispersée est présenté dans ce manuscrit, modèle que l'on pourra caractériser de polydisperse puisque prenant en compte une fonction de distribution en taille et en vi- tesse des bulles. Deux lois mathématiques particulières, une loi quadratique et une loi cubique, sont proposées dans ce manuscrit pour modéliser la fonction de distribution en taille des bulles, son évolution spatio-temporelle étant obtenue à l'aide la méthode des moments. Ces deux lois ayant une expression mathématique relativement simple, les différents termes d'échanges entre phases ont pu être fermés dans un cadre polydisperse. Ce modèle moyenné polydisperse a été implanté dans le code de calcul NEPTUNE_CFD, puis testé en tentant de reproduire par la simulation l'expérience DEBORA du CEA Grenoble, expérience dédiée à l'étude des écoulements bouillants sous-saturés.
The objective of this work was to improve the modelling of boiling bubbly flows.We focused on the modelling of the polydisperse aspect of a bubble population, i.e. the fact that bubbles have different sizes and different velocities. The multi-size aspect of a bubble pupolation can originate from various mechanisms. For the bubbly flows we are interested in, bubble coalescence, bubble break-up, phase change kinematics and/or gas compressibility inside the bubbles can be mentionned. Since, bubble velocity depends on bubble size, the bubble size spectrum also leads to a bubble velocity spectrum. An averaged model especially dedicated to dispersed flows is introduced in this thesis. Closure of averaged inter- phase transfer terms are written in a polydisperse framework, i.e. using a distribution function of the bubble sizes and velocities. A quadratic law and a cubic law are here proposed for the modelling of the size distribution function, whose evolution in space and time is then obtained with the use of the moment method. Our averaged model has been implemented in the NEPTUNE_CFD computation code in order to simulate the DEBORA experiment. The ability of our model to deal with sub-cooled boiling flows has therefore been evaluated.
Advisors/Committee Members: Lhuillier, Daniel (thesis director), Morel, Christophe (thesis director).
Subjects/Keywords: Bulles; Changement de phase; Changement de phase; Bubble; Boiling flow; Multi-size
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APA (6th Edition):
Zaepffel, D. (2011). Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENI070
Chicago Manual of Style (16th Edition):
Zaepffel, Didier. “Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed March 04, 2021.
http://www.theses.fr/2011GRENI070.
MLA Handbook (7th Edition):
Zaepffel, Didier. “Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows.” 2011. Web. 04 Mar 2021.
Vancouver:
Zaepffel D. Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2011GRENI070.
Council of Science Editors:
Zaepffel D. Modélisation des écoulements bouillants à bulles polydispersées : Modelling of polydisperse bublly flows. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENI070
Virginia Tech
10.
Drew, Brady Patterson.
Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water.
Degree: MS, Mechanical Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/76852
► The entrainment process in two-phase buoyant jets differs significantly from their singlephase counterparts, and is not well understood. Entrainment models developed for singlephase flow are…
(more)
▼ The entrainment process in two-
phase buoyant jets differs significantly from their singlephase counterparts, and is not well understood. Entrainment models developed for singlephase
flow are often used in two-
phase jetting simulations, albeit with limited success. In this work, Particle Image Velocimetry (PIV) and shadowgraph
flow visualization experiments have been conducted on submerged round gas jets of varying speeds and nozzle diameters with the goal of improving our understanding of the entrainment process in a two-
phase (gas-liquid) jet. The total entrainment estimated using the PIV measurements is higher than the respective values suggested by a common empirical model developed for singlephase buoyant jets. A two-
phase theoretical entrainment model used for comparison shows an overestimation of entrainment, but predicts the increase in the rate of entrainment with axial distance from the jet nozzle seen in the PIV results.
This thesis also presents advances in PIV processing methodology that were developed concurrently with the entrainment research. The novel Spectral
Phase Correlation (SPC) allows for particle displacement to be determined directly from
phase information in the Fourier domain. Some of the potential benefits of the SPC explored here include (1) avoidance of errors introduced by spatial peak-finding routines; (2) use of a modal analysis that can be used to provide information such as correlation quality; and (3) introduction of a means of incorporating information from multiple image windows. At low image noise levels, the method performs as well as an advanced CC-based method. However, difficulties unwrapping the aliased
phase information cause the SPC's performance to degrade at high noise levels.
Advisors/Committee Members: Jung, Sunghwan (committee member), Charonko, John J. (committeecochair), Vlachos, Pavlos P. (committeecochair).
Subjects/Keywords: Entrainment; Particle Image Velocimetry (PIV); Submerged Gas Jets; Spectral Phase Correlation; Multi-phase flow
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APA (6th Edition):
Drew, B. P. (2011). Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/76852
Chicago Manual of Style (16th Edition):
Drew, Brady Patterson. “Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water.” 2011. Masters Thesis, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/76852.
MLA Handbook (7th Edition):
Drew, Brady Patterson. “Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water.” 2011. Web. 04 Mar 2021.
Vancouver:
Drew BP. Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/76852.
Council of Science Editors:
Drew BP. Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/76852
Texas A&M University
11.
Dehkharghanian, Vadoud.
Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant.
Degree: PhD, Civil Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/159109
► In this research, we used experiments to measure the passive concentration field inside a multi-phase plume with an application to help design an injection system…
(more)
▼ In this research, we used experiments to measure the passive concentration field inside a
multi-
phase plume with an application to help design an injection system for subsea injection of dispersant during an accidental blowout. 3D Planar Laser Induced Fluorescence (3DPLIF) technique was adapted to study the spatial distribution of the concentration field created by different types of injectors. This technique requires new correction processes to account for the presence effects of the immiscible particles in the field of view. We used the developed method to measure the concentration field inside a bubble plume with different
flow rates to investigate the effects of different injectors on the characteristics of the passive scalar concentration field.
We derived new correction processes to convert fluorescent light intensity to concentration, such as an image processing method to detect and remove the signature of bubbles and shadows from an image and an object detection method to specifically find bubbles and calculate the presence probability inside the bubble plume. Based on the bubble concentration, the laser attenuation can be estimated, which is required for accurate concentration measurements.
We used our developed 3D-PLIF technique to measure the concentration field created by three types of injector: single point, wand, and collar diffusor to study the effects of injection geometry as well as injection position on the characteristics of the concentration field.
Advisors/Committee Members: Socolofsky, Scott A. (advisor), Chang, Kuang-An (committee member), Hetland, Robert (committee member), Hassan, Yassin A. (committee member).
Subjects/Keywords: Concentration field measurement; Multi-phase flow; Laser Induced fluorescence
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APA ·
Chicago ·
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CSE |
Export
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APA (6th Edition):
Dehkharghanian, V. (2016). Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/159109
Chicago Manual of Style (16th Edition):
Dehkharghanian, Vadoud. “Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant.” 2016. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/159109.
MLA Handbook (7th Edition):
Dehkharghanian, Vadoud. “Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant.” 2016. Web. 04 Mar 2021.
Vancouver:
Dehkharghanian V. Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/159109.
Council of Science Editors:
Dehkharghanian V. Concentration Field of Passive Scalar in a Multi-Phase Plume: Experimental Study on Applying of the 3D-PLIF Technique and Its Application for Design of Subsea Injection System of Dispersant. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/159109
Texas A&M University
12.
Gudigopuram, Sujan Reddy.
Experimental and CFD Simulation of a Helico-Axial Pump.
Degree: PhD, Mechanical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/187330
► Multiphase flows are encountered in the majority of crude oil wells. Electrical Submersible Pumps (ESPs) are used to pump the crude oil in wells that…
(more)
▼ Multiphase flows are encountered in the majority of crude oil wells. Electrical Submersible Pumps (ESPs) are used to pump the crude oil in wells that do not have sufficient pressure head. Conventional ESPs are mixed or radial
flow pumps which have limited gas handling capabilities. For handling high GVF (Gas Volume Fraction) fluids, advanced gas handlers (a type of ESP) were used in series before the conventional ESPs. These homogenize the
flow and eliminate gas lock occurrence. The behavior of ESPs (Advanced Gas Handlers) under two
phase flows was not widely understood. To better understand the behavior, a helico-axial pump capable of handling fluids up to 90% GVF has been investigated.
Using the high pressure closed loop test facility at the Turbo Machinery Laboratory, a 4-stage helico-axial pump has been tested experimentally using water and air as test fluids for varying conditions such as inlet pressure,
flow rate, GVF, and rotating speed. Performance maps of the pump along with vibrational characteristics have been obtained to identify the Best Efficiency Point (BEP) and stable operating regimes. The head degradation of the pump under two
phase flow conditions as a function of stage has been obtained. From the head degradation results, the number of advanced gas handler stages to be used before conventional ESPs in an actual assembly has been identified to improve the total system efficiency when used in the field. Based on the experimental data, a new empirical model is developed to predict the stage by stage performance under
multi-
phase flow conditions.
To understand the two-
phase flow behavior in the pump,
flow visualization was performed on a full scale single stage pump that was designed and built using transparent Polycarbonate material.
Flow visualization was performed using a laser and a high speed camera. The visualization has provided much insight into how the
flow goes through the pump: showing recirculation zones, back
flow, vortices, and impeller diffuser blade interaction. The bubble diameter obtained from the
flow visualization is being used as one of the inputs to allow two
phase CFD Simulations.
The efficiency of Advanced Gas Handlers is less than conventional ESPs. To better understand the
flow behavior, 3-D single- and two-
phase flow through the pump was modeled numerically using the commercial software ANSYS. The pump
flow model was validated using the experimental data. From the single-
phase simulations, regions of improvement were identified to increase the efficiency of the pump. Different diffuser designs were evaluated to improve the performance of the pump. Two-
phase simulations are performed to study the homogeneity of the
flow and to identify head degradation. Head degradation can be improved by identifying the regions where the phases tend to separate in the
flow path and eliminating them.
Advisors/Committee Members: Morrison, Gerald (advisor), Banerjee, Debjyoti (committee member), Han, Je (committee member), Randall, Robert (committee member).
Subjects/Keywords: Helico axial pump; Multi-Phase flow; CFD; Visualization
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APA (6th Edition):
Gudigopuram, S. R. (2016). Experimental and CFD Simulation of a Helico-Axial Pump. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/187330
Chicago Manual of Style (16th Edition):
Gudigopuram, Sujan Reddy. “Experimental and CFD Simulation of a Helico-Axial Pump.” 2016. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/187330.
MLA Handbook (7th Edition):
Gudigopuram, Sujan Reddy. “Experimental and CFD Simulation of a Helico-Axial Pump.” 2016. Web. 04 Mar 2021.
Vancouver:
Gudigopuram SR. Experimental and CFD Simulation of a Helico-Axial Pump. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/187330.
Council of Science Editors:
Gudigopuram SR. Experimental and CFD Simulation of a Helico-Axial Pump. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/187330
Texas A&M University
13.
Patil, Abhay.
Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps.
Degree: PhD, Mechanical Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/150982
► Twin-screw pumps are economical alternatives to the conventional multiphase system and are increasingly used in the oil and gas industry due to their versatility in…
(more)
▼ Twin-screw pumps are economical alternatives to the conventional multiphase system and are increasingly used in the oil and gas industry due to their versatility in transferring the multiphase mixture with varying Gas Void Fraction (GVF). Present work focuses on the experimental and numerical analysis of twin-screw pumps for different operating conditions. Experimental evaluation aims to understand steady state and transient behavior of twin-screw pumps. Detailed steady state evaluation helped form better understanding of twin-screw pumps under different operating conditions. A comparative study of twin-screw pumps and compressors contradicted the common belief that compressor efficiency is better than the efficiency of twin-screw pumps. Transient analysis at high GVF helped incorporate necessary changes in the design of sealflush recirculation loop to improve the efficiency of the pump. The effect of viscosity of the sealflush fluid at high GVF on pump performance was studied. Volumetric efficiency was found to be decreased with increase in viscosity.
Flow visualization was aimed to characterize
phase distribution along cavities and clearances at low to high GVF. Dynamic pressure variation was studied along the axis of the screw which helped correlate the GVF, velocity and pressure distribution.
Complicated fluid
flow behavior due to enclosed fluid pockets and interconnecting clearances makes it difficult to numerically simulate the pump. Hence design optimization and performance prediction incorporates only analytical approach and experimental evaluation. Current work represents an attempt to numerically simulate a multiphase twin-screw pump as a whole. Single
phase 3D CFD simulation was performed for different pressure rise. The pressure and velocity profile agreed well with previous studies. Results are validated using an analytical approach as well as experimental data. A two-
phase CFD simulation was performed for 50% GVF. An Eulerian approach was employed to evaluate multiphase
flow behavior. Pressure, velocity, temperature and GVF distributions were successfully predicted using CFD simulation. Bubble size was found to be most dominant parameter, significantly affecting
phase separation and leakage
flow rate. Better
phase separation was realized with increased bubble size, which resulted in decrease in leakage
flow rate. CFD results agreed well with experimental data for the bubble size higher than 0.08 mm.
Advisors/Committee Members: Morrison, Gerald L (advisor), Han, Je-Chin (committee member), Hassan, Yassin A (committee member), Randall, Robert E (committee member).
Subjects/Keywords: Multi phase flow; twin screw pump; cfd; simulation
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APA ·
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Export
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APA (6th Edition):
Patil, A. (2013). Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/150982
Chicago Manual of Style (16th Edition):
Patil, Abhay. “Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps.” 2013. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/150982.
MLA Handbook (7th Edition):
Patil, Abhay. “Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps.” 2013. Web. 04 Mar 2021.
Vancouver:
Patil A. Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/150982.
Council of Science Editors:
Patil A. Performance Evaluation and CFD Simulation of Multiphase Twin-Screw Pumps. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/150982
University of Houston
14.
Meziou, Amine.
Low-Dimensional Modeling of Two-Phase Flow in Pipelines.
Degree: PhD, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4623
► Multiphase flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase flow models having utility in…
(more)
▼ Multiphase
flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase
flow models having utility in system design, control design, and system health-monitoring is therefore an important engineering and scientific challenge, particularly when the pipelines are parts of a complex subsea architecture.
Presented in this dissertation are
multi-physics reduced-order fluid and thermal models of one-dimensional transient two-
phase flow in pipelines. The proposed fluid model is comprised of a steady state multiphase
flow mechanistic model in series with a transient reduced-order single-
phase flow model. The low-dimensional model parameters are realized by developing equivalent fluid properties (i.e., viscosity, density and bulk modulus) that are a function of the
flow pattern, steady-state pressure gradient, and liquid holdup identified through the mechanistic model. The fluid model is then coupled with a two-
phase flow heat transfer model via a
multi-physics integration block used to update the fluid properties along the pipeline based on the predicted pressure and temperature conditions. The model ability to reproduce the dynamics of multiphase
flow in pipes is first evaluated upon comparison to OLGA. The two models show a good agreement of the steady-state response and the period of oscillation indicating a similar estimation of the pipeline natural frequency. However, they present a discrepancy in the overshoot values and the settling time due to a difference in the calculated damping ratio. Both models are then compared to transient two-
phase flow data collected at the National University of Singapore
flow loop. It is concluded that the low-dimensional model is characterized by a superior overall performance when compared to OLGA. The developed model accuracy improves when considering a higher order but is associated with a higher simulation time. The established
multi-physics models are used for the design, modeling, simulation, and optimization of multiple-wells subsea architectures with a High Integrity Pressure Protection System (HIPPS) as an alternative to reduce the subsea capital expenditure (CAPEX).
The utility of the developed low-dimensional models is the reduced computational burden of estimating transient multiphase
flow in pipelines, thereby enabling real-time estimation of pressure, temperature, and
flow rate.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Multi-phase flow; Pipelines; Transient; Steady-state; Subsea; Fluid dynamics; Thermal
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Meziou, A. (2017). Low-Dimensional Modeling of Two-Phase Flow in Pipelines. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4623
Chicago Manual of Style (16th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Doctoral Dissertation, University of Houston. Accessed March 04, 2021.
http://hdl.handle.net/10657/4623.
MLA Handbook (7th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Web. 04 Mar 2021.
Vancouver:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Internet] [Doctoral dissertation]. University of Houston; 2017. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10657/4623.
Council of Science Editors:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Doctoral Dissertation]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4623
University of Adelaide
15.
Tam, Alexander.
Mathematical Modelling of Pattern Formation in Yeast Biofilms.
Degree: 2019, University of Adelaide
URL: http://hdl.handle.net/2440/122613
► We use mathematical modelling and experiments to investigate yeast biofilm growth and pattern formation. Biofilms are sticky communities of cells and fluid residing on surfaces.…
(more)
▼ We use mathematical modelling and experiments to investigate yeast biofilm growth and pattern formation. Biofilms are sticky communities of cells and fluid residing on surfaces. As yeast biofilms are a leading cause of hospital-acquired infections, researchers have developed methods of growing them on semi-solid agar. These biofilms initially form a thin circular shape, before transitioning to a non-uniform floral morphology. To quantify biofilm growth, we use a radial statistic the measure expansion speed, and an angular pair correlation function to quantify petal formation. These spatial statistics enable comparison between experiments and mathematical model predictions. Our motivation is to improve understanding of the physical mechanisms governing biofilm formation. One hypothesised mechanism is nutrient-limited growth, in which movement and consumption of nutrients drives growth and generates patterns. Another hypothesis is that yeast biofilms expand by sliding motility, where cell proliferation and weak biofilm–substratum adhesion drive growth. Mathematical modelling enables us to investigate the contribution of each hypothesised mechanism to biofilm growth and pattern formation. We use a reaction–diffusion system with non-linear, degenerate cell diffusion to model nutrient-limited biofilm growth. This model admits sharp-fronted travelling wave solutions that advance with constant speed, an assumption consistent with experimental data. To investigate whether the reaction–diffusion model can explain petal formation, we consider the linear stability of planar travelling wave solutions to transverse perturbations. There is good agreement between the theory and experimental data, suggesting that nutrient-limited growth can explain floral pattern formation. Next, we introduce biofilm mechanics by deriving a two-
phase fluid model. We treat the biofilm as a mixture of cells and an extracellular matrix, and obtain governing equations from mass and momentum conservation. Since yeast biofilm height is small compared to their radius, we use the thin-film approximation in two scaling regimes to simplify the model. The extensional
flow regime involves weak biofilm–substratum adhesion, and models expansion by sliding motility. In contrast, the lubrication regime involves strong biofilm– substratum adhesion, and large pressure and surface tension. We compute axisymmetric numerical solutions to both thin-film models to investigate how mechanics affects biofilm growth. There is good agreement between the extensional
flow model and experimental data, suggesting that sliding motility can explain expansion speed. Parameter sensitivity analyses show that increased nutrient supply and biomass production rates generate faster expansion. The effect of surface tension, which represents the strength of cell–cell adhesion, is the key difference between the two regimes. In the extensional
flow model, surface tension inhibits ridge formation close to the leading edge, but does not affect expansion speed. In contrast, surface tension…
Advisors/Committee Members: Binder, Ben (advisor), Green, Ed (advisor), Balasuriya, Sanjeeva (advisor), School of Mathematical Sciences (school).
Subjects/Keywords: Saccharomyces cerevisiae; reaction-diffusion; multi-phase flow; lubrication theory
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APA (6th Edition):
Tam, A. (2019). Mathematical Modelling of Pattern Formation in Yeast Biofilms. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/122613
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):
Tam, Alexander. “Mathematical Modelling of Pattern Formation in Yeast Biofilms.” 2019. Thesis, University of Adelaide. Accessed March 04, 2021.
http://hdl.handle.net/2440/122613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tam, Alexander. “Mathematical Modelling of Pattern Formation in Yeast Biofilms.” 2019. Web. 04 Mar 2021.
Vancouver:
Tam A. Mathematical Modelling of Pattern Formation in Yeast Biofilms. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2440/122613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tam A. Mathematical Modelling of Pattern Formation in Yeast Biofilms. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/122613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loughborough University
16.
Shahmohamadi, Hamed.
Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.
Degree: PhD, 2015, Loughborough University
URL: http://hdl.handle.net/2134/18460
► The main aim of this research was to investigate the mechanism of cavitation in conforming and partially conforming tribological conjunctions. The effect of cavitation on…
(more)
▼ The main aim of this research was to investigate the mechanism of cavitation in conforming and partially conforming tribological conjunctions. The effect of cavitation on load carrying capacity and frictional performance of is also investigated. This is important with regards to fuel efficiency in internal combustion (IC) engines. Friction accounts for 15–20% of IC engine losses. The piston–cylinder system contributes to 40–50% of these, with the compression ring(s) being responsible for most of this. This is because the primary function of the ring is to seal the combustion chamber, thus small emerging gaps lead to increased friction. In fact, compression ring(s) expend 3–5% of engine input fuel energy. The share of frictional losses of engine bearings is approximately 20–25%. Traditionally, prediction of performance of tribological conjunctions has been studied using Reynolds equation. When the effect of cavitation is considered, various cavitation algorithms with associated boundary conditions for lubricant rupture and reformation are proposed. These include Elrod, and Elrod and Coyne algorithms, as well as boundary conditions such as Swift-Stieber, JFO and Prandtl-Hopkins. There are a number of assumptions embodied in these approaches, as well as the use of Reynolds equation itself. These approaches do not uphold the continuity of mass and momentum in multi-phase flow, in cavitation beyond the lubricant film rupture. A detailed methodology for multi-phase flow, comprising simultaneous solution of Navier-Stokes, energy and lubricant rheological state equations is developed.
Subjects/Keywords: 621.43; Finite volume CFD; Multi-phase flow; Cavitation; Tribological conjunctions; Friction
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APA (6th Edition):
Shahmohamadi, H. (2015). Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/18460
Chicago Manual of Style (16th Edition):
Shahmohamadi, Hamed. “Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.” 2015. Doctoral Dissertation, Loughborough University. Accessed March 04, 2021.
http://hdl.handle.net/2134/18460.
MLA Handbook (7th Edition):
Shahmohamadi, Hamed. “Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.” 2015. Web. 04 Mar 2021.
Vancouver:
Shahmohamadi H. Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. [Internet] [Doctoral dissertation]. Loughborough University; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2134/18460.
Council of Science Editors:
Shahmohamadi H. Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. [Doctoral Dissertation]. Loughborough University; 2015. Available from: http://hdl.handle.net/2134/18460
Texas A&M University
17.
Katke, Tanvi.
Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics.
Degree: MS, Mechanical Engineering, 2020, Texas A&M University
URL: http://hdl.handle.net/1969.1/191705
► Electrical submersible pumps (ESP) are widely used in the oil and gas industry as a method of artificial lift. They typically consist of multiple centrifugal…
(more)
▼ Electrical submersible pumps (ESP) are widely used in the oil and gas industry as a method of artificial lift. They typically consist of multiple centrifugal pump stages that convert kinetic energy to hydraulic pressure head. ESPs frequently handle
multi-
phase flow including traces of gas which degrade their performance. Hence, it is essential to understand how two-
phase flow affects the pump performance in order to design and size ESPs.
The purpose of this project is to study two-
phase flow inside an ESP with air and water as the two fluids using ANSYS Fluent. The pump is simulated at two speeds, namely 3600 rpm and 6000 rpm for fixed bubble sizes at different gas
flow rates. The parameters monitored are pressure head, water velocity and air volume fraction distribution inside the pump. They are compared with results from population balance model that simulates the breakup and coalescence of bubbles. At low air volume fractions and high turbulence, bubbles of large size are not likely to exist in a
flow and a fixed bubble size simulation gives good results for such a case, as is also verified from previous experimental studies. The data from this project establishes a baseline for future analyses and improves the understanding of effects of bubble sizes for
multi-
phase flow through an ESP.
Advisors/Committee Members: Delgado, Adolfo (advisor), Pate, Michael (committee member), Kirkland, Karen (committee member).
Subjects/Keywords: Multi-phase flow; Electric submersible pump; Computational Fluid Dynamics
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APA (6th Edition):
Katke, T. (2020). Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/191705
Chicago Manual of Style (16th Edition):
Katke, Tanvi. “Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics.” 2020. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/191705.
MLA Handbook (7th Edition):
Katke, Tanvi. “Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics.” 2020. Web. 04 Mar 2021.
Vancouver:
Katke T. Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics. [Internet] [Masters thesis]. Texas A&M University; 2020. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/191705.
Council of Science Editors:
Katke T. Analysis of Two-Phase Flow Through an Electric Submersible Pump Using Computational Fluid Dynamics. [Masters Thesis]. Texas A&M University; 2020. Available from: http://hdl.handle.net/1969.1/191705
Virginia Tech
18.
Yang, Yihong.
Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks.
Degree: PhD, Engineering Science and Mechanics, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/77056
► Stirring tanks are very important equipments used for mixing, separating, chemical reaction, etc. A typical stirring tank is a cylindrical vessel with an agitator driving…
(more)
▼ Stirring tanks are very important equipments used for mixing, separating, chemical reaction, etc. A typical stirring tank is a cylindrical vessel with an agitator driving the fluid and generating turbulence to promote mixing. Flotation cells are widely used stirring tanks in
phase separation where multiphase
flow is involved. Flotation refers to the process in which air bubbles selectively pick up hydrophobic particles and separate them from hydrophilic solids. This technology is used throughout the mining industry as well as the chemical and petroleum industries.
In this research, efforts were made to investigate the
multi-
phase flow hydrodynamic problems of some flotation cells at different geometrical scales. Pitot-static and five-hope probes were employed to lab- pilot- and commercial-scale tanks for velocity measurements. It was found that the tanks with different scales have similar
flow patterns over a range of Reynolds numbers. Based on the velocity measurement results, flotation tanks' performance was evaluated by checking the active volume in the bulk. A fast-response five-hole probe was designed and fabricated to study the turbulence characteristics in flotation cells under single- and
multi-
phase flow conditions. The jet stream in the rotor-stator domain has much higher turbulence intensity compared with other locations. The turbulent dissipation rate (TDR) in the rotor-stator domain is around 20 times higher than that near tank's wall. The TDR could be used to calculate the bubble and particle slip velocities. An isokinetic sampling probe system was developed to obtain true samples inthe
multi-
phase flow and then measure the local void fraction. It was found that the air bubbles are carried out by the stream and dispersed to the whole bulk. However, some of the bubbles accumulate in the inactive regions, where higher void fractions were detected. The isokinetic sampling probe was then extended to be an isokinetic borescope system, which was used to detect the bubble-particle aggregates in the tank. Aggregates were found in the high-turbulence level zones. The isokinetic sampling probe and the isokinetic borescope provide new methods for flotation tank tests. An experiment was also set up to study the dynamics of bubble particle impact. Four different modes were found for the collision. The criterion is that if the fluid drainage time is less than the residence time, the attachment will occur, otherwise, the particle will bounce back.
Advisors/Committee Members: Telionis, Demetri P. (committeechair), Ragab, Saad A. (committee member), Kriz, Ronald D. (committee member), Yoon, Roe-Hoan (committee member), Luttrell, Gerald H. (committee member).
Subjects/Keywords: multi-hole probe; turbulence; multi-phase flow; bubble-particle interaction; isokinetic borescope; isokinetic sampling probe
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APA (6th Edition):
Yang, Y. (2011). Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77056
Chicago Manual of Style (16th Edition):
Yang, Yihong. “Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks.” 2011. Doctoral Dissertation, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/77056.
MLA Handbook (7th Edition):
Yang, Yihong. “Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks.” 2011. Web. 04 Mar 2021.
Vancouver:
Yang Y. Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/77056.
Council of Science Editors:
Yang Y. Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/77056
University of Southern California
19.
Javaheri, Mohammad.
The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media.
Degree: PhD, Petroleum Engineering, 2013, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/356870/rec/7210
► Carbon Capture and Storage (CCS) is the capture of carbon dioxide (CO₂) from large source points, such as power plants, and storing it in geological…
(more)
▼ Carbon Capture and Storage (CCS) is the capture of
carbon dioxide (CO₂) from large source points, such as power
plants, and storing it in geological formation. It is a potential
means of reducing CO₂ concentration in the atmosphere to mitigate
global warming and ocean acidification. Geological formations are
considered to be the most promising storage sites for carbon
dioxide. Deep saline aquifers have the most storage capacity
compared to other geological sites. ❧ After CO₂ is injected into an
aquifer, a fraction of it, that can be large, is immobilized in the
form of residual
phase. Residual entrapment is an important
component in successful storage of CO₂ in saline aquifers. Trapped
CO₂ is eventually dissolved into the brine. Estimation of the
fraction of the injected CO₂ that is trapped depends on CO₂
saturation profiles and saturation history. In the simulation of
CO₂ injection into saline aquifers, conventional relative
permeabilities functions are commonly used and it is assumed that
viscous coupling is negligible. We show that the vertical migration
of CO₂ in saline aquifers is often dominated by counter-current
flow. Experimental and simulation studies of two- and three-
phase
flow in porous media show that the counter-current relative
permeability is less than co-current relative permeability, that
are commonly used (current industry standard) in the simulation of
multiphase
flow. ❧ This study focuses on including a velocity-
-dependent relative permeability model in the simulation of
multiphase
flow in porous media to account for the
flow dynamics
(co- vs. counter-current
flow) on relative permeability and fluid
mobility. We use both co-current and counter-current relative
permeability in the simulation of CO₂ injection from a well into an
aquifer and show that the plume saturation profile is influenced by
the dynamic relative permeability changes (transitions between
co-current and counter-current
flow). The fraction of the injected
CO₂ that is trapped and the time-scale of vertical migration of CO₂
both increase when the transitions from co- to counter-current
relative permeability are included. We conclude that using one set
of relative permeabilities is not sufficient in the simulation of
CO₂ injection into saline aquifers. We also demonstrate that a
velocity-dependent mobility does not introduce numerical
instability and that the simulation time does not change
significantly. ❧ We have applied the velocity-dependent relative
permeability in the simulation of gas (CO₂) injection into an oil
reservoir in the context of enhanced oil recovery with three mobile
phases. Cumulative oil and gas production increases just slightly
in the new model, but water production decreases quite
significantly. That is due to a better sweep efficiency when
counter-current relative permeability is included in the
calculation of phases' mobilities. ❧ Counter-current relative
permeability can be measured directly using a controlled
experimental design to eliminate the effect of boundaries on
saturation distribution. It can…
Advisors/Committee Members: Jessen, Kristian (Committee Chair), Ershaghi, Iraj (Committee Member), Domaradzki, Julian A. (Committee Member).
Subjects/Keywords: counter-current flow; porous media; reservoir simulation; CO₂ sequestration; relative permeability; multi-phase flow
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APA (6th Edition):
Javaheri, M. (2013). The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/356870/rec/7210
Chicago Manual of Style (16th Edition):
Javaheri, Mohammad. “The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media.” 2013. Doctoral Dissertation, University of Southern California. Accessed March 04, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/356870/rec/7210.
MLA Handbook (7th Edition):
Javaheri, Mohammad. “The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media.” 2013. Web. 04 Mar 2021.
Vancouver:
Javaheri M. The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media. [Internet] [Doctoral dissertation]. University of Southern California; 2013. [cited 2021 Mar 04].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/356870/rec/7210.
Council of Science Editors:
Javaheri M. The role of counter-current flow in the modeling and
simulation of multi-phase flow in porous media. [Doctoral Dissertation]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/356870/rec/7210
University of Houston
20.
Mirzaeian, Nima.
Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits.
Degree: MS, Engineering Technology, 2018, University of Houston
URL: http://hdl.handle.net/10657/3241
► As an extension to the previously investigated buoyancy-driven exchange flow of pure fluids in inclined ducts, we propose an experimental and theoretical approach to practically…
(more)
▼ As an extension to the previously investigated buoyancy-driven exchange
flow of pure fluids in inclined ducts, we propose an experimental and theoretical approach to practically study the effect of solid particles within the
flow. The
flow problem starts in a density-unstable lock-exchange configuration with heavy suspension being on top of a light pure fluid in a long narrow pipe or channel. Suspension is a mixture of negatively-buoyant solid particles in a Newtonian pure fluid. The density difference between the heavy and light phases is small enough to neglect the inertia (Boussinesq approximation).
Flow is firstly studied through an experimental framework. Various sedimentary, transitionary, and mixing regimes are observed based on the pipe inclination angle, [Greek small letter beta], and initial volume fraction of particles, [Greek small letter phi][subscript 0] . The results are mapped on dimensionless diagrams suitable for industrial design and environmental planning. Effects of particle size and fluid’s viscosity are further discussed. The sedimentary behavior is diminished by reducing particle size, whereas remains unchanged with fluid’s viscosity. The advancement frontal speed of the heavy suspension layer into the light pure fluid, V[subscript f] , is measured over full range of experiments. It is found that V[subscript f] becomes larger as the pipe is titled away from the horizontal direction. An intermediate range of particle volume fraction, [Greek small letter phi][subscript 0], is interestingly discovered to lead to maximal V[subscript 0] . A non-dimensional scale for frontal velocity is successfully proposed constituting various
flow and geometrical parameters.
For strictly vertical duct, a lubrication model is developed to theoretically investigate the
flow in this simplified configuration. Novel particle-rich zones inside the suspension are further discovered in the vicinity of the advancing heavy and light fronts. It was further revealed that the geometry confinement plays a significant role in exchange
flow dynamics through formation of interfacial patterns and particle-enrichment behavior. The fundamental findings of this thesis help understand the dynamics of important flows observed in nature within oceanographic and geophysical contexts as well as in industry through discharge, transport and dispersion of slurries, mine tailings, pastes, pharmaceuticals, paper pulp, drill cuttings, sludge, effluents and sewage, manufacture of cement clinker in inclined kilns, mineral processing in hydrocyclones, and inclined fluidized beds.
Advisors/Committee Members: Alba, Kamran (advisor), El Nahas, Medhat (committee member), Singh, Navdeep (committee member), Conrad, Jacinta C. (committee member).
Subjects/Keywords: Particle-laden; Buoyancy-driven flow; Flow; Fluid dynamics; Suspensions; Complex Fluid; Multi-phase flow; Buoyant Exchange Flow
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APA (6th Edition):
Mirzaeian, N. (2018). Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/3241
Chicago Manual of Style (16th Edition):
Mirzaeian, Nima. “Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits.” 2018. Masters Thesis, University of Houston. Accessed March 04, 2021.
http://hdl.handle.net/10657/3241.
MLA Handbook (7th Edition):
Mirzaeian, Nima. “Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits.” 2018. Web. 04 Mar 2021.
Vancouver:
Mirzaeian N. Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits. [Internet] [Masters thesis]. University of Houston; 2018. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10657/3241.
Council of Science Editors:
Mirzaeian N. Buoyancy-driven Particle-laden Exchange Flows in Inclined Conduits. [Masters Thesis]. University of Houston; 2018. Available from: http://hdl.handle.net/10657/3241
INP Toulouse
21.
Clavier, Rémi.
Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds.
Degree: Docteur es, Hydrologie, Hydrochimie, Sols, Environnement, 2015, INP Toulouse
URL: http://www.theses.fr/2015INPT0124
► Ce travail de thèse porte sur l’étude des pertes de pression pour des écoulements monophasiques et diphasiques inertiels au travers de milieux poreux. Son objectif…
(more)
▼ Ce travail de thèse porte sur l’étude des pertes de pression pour des écoulements monophasiques et diphasiques inertiels au travers de milieux poreux. Son objectif est d’aider à la compréhension et à la modélisation des transferts de quantité de mouvement à l’intérieur de lits de particules, en lien avec la problématique de la gestion d’un accident grave dans un réacteur nucléaire. En effet, lors d’un tel accident, la dégradation du coeur du réacteur peut amener celui-ci à s’effondrer pour former un lit de débris, que l’on peut assimiler à un milieu poreux à haute température et dégageant de la chaleur. Ce travail de thèse s’inscrit dans un projet de recherche en sûreté nucléaire visant à prédire la refroidissabilité d’un lit de débris par injection d’eau, ou « renoyage ». Une étude expérimentale des pertes de pression pour des écoulements monodimensionnels monophasiques et diphasiques à froid est proposée dans des situations représentatives du cas réacteur, en termes de granulométrie, de formes de particules et de vitesses d’écoulement. Les expériences réalisées apportent un complément important aux données existantes, en permettant notamment d’explorer les domaines d’écoulements diphasiques avec nombres de Reynolds liquides non nuls, tout en mesurant le taux de vide, ce qui est essentiel pour une modélisation. Des modèles prédictifs pour les pertes de pression à l’intérieur d’écoulements monophasiques et diphasiques au travers de lits de particules sont établis à partir des structures d’équations obtenues par une prise de moyenne volumique des équations de conservation locales. L’observation des écoulements monophasiques montrent que des lois de type Darcy-Forchheimer avec une correction quadratique en vitesse de filtration sont à même de prédire les pertes de pression avec une précision supérieure à 10%. Une étude numérique a montré que ce résultat est applicable pour un lit désordonné de particules peu rugueuses. L’étude des écoulements diphasiques montre qu’une structure d’équations de type Darcy-Forchheimer généralisée, incluant des termes supplémentaires pour prendre en compte les effets inertiels et les frottements interfaciaux, permet de reproduire le comportement des pertes de pression dans cette situation. Un nouveau modèle est proposé, et comparé aux données expérimentales et aux modèles utilisés dans les codes de simulation des accidents graves.
This work deals with single and two-phase flow pressure losses in porous media. The aim is to improve understanding and modeling of momentum transfer inside particle beds, in relation with nuclear safety issues concerning the reflooding of debris beds during severe nuclear accidents. Indeed, the degradation of the core during such accidents can lead to the collapse of the fuel assemblies, and to the formation of a debris bed, which can be described as a hot porous medium. This thesis is included in a nuclear safety research project on coolability of debris beds during reflooding sequences. An experimental study of single and two-phase cold-flow pressure losses…
Advisors/Committee Members: Quintard, Michel (thesis director), Fichot, Florian (thesis director).
Subjects/Keywords: Lits de débris; Thermohydraulique; Inertiel; Nuclear safety; Debris bed; Thermohydraulic; Porous media; Inertial; Single-phase flow; Multi-phase flow
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APA (6th Edition):
Clavier, R. (2015). Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2015INPT0124
Chicago Manual of Style (16th Edition):
Clavier, Rémi. “Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds.” 2015. Doctoral Dissertation, INP Toulouse. Accessed March 04, 2021.
http://www.theses.fr/2015INPT0124.
MLA Handbook (7th Edition):
Clavier, Rémi. “Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds.” 2015. Web. 04 Mar 2021.
Vancouver:
Clavier R. Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds. [Internet] [Doctoral dissertation]. INP Toulouse; 2015. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2015INPT0124.
Council of Science Editors:
Clavier R. Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris : Experimental study and modelling of pressure losses during reflooding of a debris beds. [Doctoral Dissertation]. INP Toulouse; 2015. Available from: http://www.theses.fr/2015INPT0124
Penn State University
22.
Ahn, Eunnam.
MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES.
Degree: 2018, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/14892exa5166
► A large amount of unwanted water and gas production from upward or downward coning can significantly erode profits in oil recovery processes. Simulation estimates of…
(more)
▼ A large amount of unwanted water and gas production from upward or downward coning can significantly erode profits in oil recovery processes. Simulation estimates of the magnitude and timing of coning can be erroneous owing to unknown reservoir heterogeneity, large grid blocks near the wells, and inaccuracies in simulation well models, such as that from Peaceman. This may lead to a failure to accurately calculate the critical oil rate in a given case. Thus, a good understanding of coning behavior is required for an effective water and gas control. An improved analytical water and gas control solution helps facilitate the computation of the critical rate and avoidance of unwanted water and gas. The solution may lead to a significant reduction in operating cost during oil production.
This thesis presents a
multi-well steady-state analytical solution for coning of three phases (water, oil, and gas) flowing simultaneously. The solution for multiple wells is developed using the principle of superposition with a potential function that includes capillary pressure and relative permeability. The assumption of vertical equilibrium (VE) is made, which gives maximum vertical crossflow and therefore the largest possible coning. Any model for relative permeability and capillary pressure can be used, although we used Stone 2 for relative permeability and Brooks-Corey for capillary pressure. We give dimensionless inflow performance windows (IPW) to show the allowable physical window of three-
phase rates and the maximum oil rate as a function of the water and the total well
flow rate. The new potential functions are also used to demonstrate superposition for several well patterns with no-
flow boundaries. Besides estimating critical oil rates, the solution could be important to benchmark numerical solutions and improve the accuracy of Peaceman’s well model.
Advisors/Committee Members: Russell Taylor Johns, Thesis Advisor/Co-Advisor.
Subjects/Keywords: analytical solution; coning; vertical equilibrium; steady-state; multi-well; three-phase flow
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APA (6th Edition):
Ahn, E. (2018). MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14892exa5166
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):
Ahn, Eunnam. “MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES.” 2018. Thesis, Penn State University. Accessed March 04, 2021.
https://submit-etda.libraries.psu.edu/catalog/14892exa5166.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ahn, Eunnam. “MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES.” 2018. Web. 04 Mar 2021.
Vancouver:
Ahn E. MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Mar 04].
Available from: https://submit-etda.libraries.psu.edu/catalog/14892exa5166.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ahn E. MULTI-WELL ANALYTICAL SOLUTION FOR CONING UNDER SIMULTANEOUS STEADY-STATE FLOW OF THREE PHASES. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/14892exa5166
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
23.
Abah, Alphonsus Igoche.
Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/21276
► ABSTRACT Hydraulic fracture treatment of shale gas wells does not always yield the expected folds of increase in gas production. Low production rates could be…
(more)
▼ ABSTRACT
Hydraulic fracture treatment of shale gas wells does not always yield the expected folds of increase in gas production. Low production rates could be attributed to a number of factors like proppant crushing, proppant diagenesis, clay swelling and rock-fluid interactions based on previous work (Osholake, Wang, Ertekin, 2011; Yue, 2012). In this research work, we evaluated the effect of
multi-
phase flow, capillary pressure, length of shut-in time and proppant crushing on performances of hydraulically fractured Marcellus Shale wells. To accomplish this, a 2-dimensional, 2-
phase water-gas model was developed using a commercial software. Three hydraulic fracture (HF1, HF2, HF3) with different network sizes were used to simulate the effect of the above factors on long-term gas production and fracture fluid recovery from hydraulically fractured Marcellus wells. Two types of proppants were used to evaluate the effect of conductivity on the impact of the factors being studied.
With high conductivity 20/40 ceramics proppant in the hydraulic fractures, long term gas production was not affected by any of the factors studied. With 20/40 ceramics fracture fluid recovery on the other hand was affected by all the factors studied. Shut-in time had the greatest effect on fracture fluid recovery. Less than 1% of the fracture fluid used for treating the well was recovered after 1-year shut-in.
With the less conductive 100 mesh sand, long term gas production and fracture fluid recovery were affected by some of the factors studied.
Multi-
phase flow and proppant crushing were found to decrease cumulative gas production. Effect of proppant crushing on gas production was greater compared to
multi-
phase flow. In twenty years of production,
multi-
phase flow decreased gas production by 1.8%, 2.2% and 3.9% in HF1, HF2 and HF3 respectively while proppant crushing decreased gas production by 3.5%, 3.9% and 5.8% in HF1, HF2 and HF3 respectively. Capillary pressure had little or no effect on long-term gas production, but was observed to delay gas peak during initial production. Long term gas production was unaffected by shut-in time. Fracture fluid recovery was decreased by high capillary pressure, increased shut-in time and proppant crushing. After one year of shut-in, less than 1 % of fracture fluid was recovered.
The new understanding helps engineers design better treatment and flowback operation in Marcellus.
Advisors/Committee Members: Yilin Wang, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Hydraulic; fracture; fracturing; marcellus; proppant; multi-phase flow; shut-in; capillary pressure
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APA (6th Edition):
Abah, A. I. (2014). Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/21276
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):
Abah, Alphonsus Igoche. “Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs.” 2014. Thesis, Penn State University. Accessed March 04, 2021.
https://submit-etda.libraries.psu.edu/catalog/21276.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Abah, Alphonsus Igoche. “Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs.” 2014. Web. 04 Mar 2021.
Vancouver:
Abah AI. Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 04].
Available from: https://submit-etda.libraries.psu.edu/catalog/21276.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Abah AI. Effect of Multi-phase Flow on Recovery of Fracture Fluid and Gas in Marcellus Shale Reservoirs. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/21276
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Tahmasbi Nowtarki, Koroush.
Two phase hydrodynamics in cross-flow distillation.
Degree: PhD, 1997, Imperial College London
URL: http://hdl.handle.net/10044/1/8424
Subjects/Keywords: 660; Distillation trays; Multi-phase flow
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APA (6th Edition):
Tahmasbi Nowtarki, K. (1997). Two phase hydrodynamics in cross-flow distillation. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/8424
Chicago Manual of Style (16th Edition):
Tahmasbi Nowtarki, Koroush. “Two phase hydrodynamics in cross-flow distillation.” 1997. Doctoral Dissertation, Imperial College London. Accessed March 04, 2021.
http://hdl.handle.net/10044/1/8424.
MLA Handbook (7th Edition):
Tahmasbi Nowtarki, Koroush. “Two phase hydrodynamics in cross-flow distillation.” 1997. Web. 04 Mar 2021.
Vancouver:
Tahmasbi Nowtarki K. Two phase hydrodynamics in cross-flow distillation. [Internet] [Doctoral dissertation]. Imperial College London; 1997. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10044/1/8424.
Council of Science Editors:
Tahmasbi Nowtarki K. Two phase hydrodynamics in cross-flow distillation. [Doctoral Dissertation]. Imperial College London; 1997. Available from: http://hdl.handle.net/10044/1/8424
KTH
25.
Hirota, Masato.
An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging.
Degree: Mechanics, 2013, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202628
► This study deals with fibre suspension flows through cylindrical pipes. Thepresent work aims at measurements of opaque flows, which are common inindustries. Nuclear magnetic…
(more)
▼ This study deals with fibre suspension flows through cylindrical pipes. Thepresent work aims at measurements of opaque flows, which are common inindustries. Nuclear magnetic resonance imaging (NMRI) and ultrasound velocimetryprofiling (UVP) were employed as non-invasive and optic-independenttools to measure the velocity profiles. As a first experiment, a paper-pulp suspensionflow through a sudden contraction and expansion was investigated.The results show the NMRI technique can be used to measure the stronglyunsteady flow such as separated regions though the MR signal is attenuateddue to the turbulence in the flow. The flow loop had however an insufficientinlet length which caused asymmetric profiles at the test section. As a secondexperiment, a flow loop which provided fully developed flows at the test sectionwas designed. After that, the velocity profiles of rayon-fibre and micro-spheresuspension flows were measured by the NMRI and the UVP independently.In principle, these two techniques measure the different velocities of the fibresuspensionflows, i.e. the velocity of the water and the fibre. In dilute suspensionflows, where the velocities of the two phases were assumed to be thesame, the velocity profiles were in good agreement. This shows the validityof the two measurement techniques. However, it should be pointed out thatthere is a limitation of the current UVP method for highly concentrated flows.The velocity profiles obtained by the UVP at high concentrations seems notto represent physics while the NMRI is not affected by the concentrations. Itis argued that the advances of the NMRI for the measurement of the highlyconcentrated flows.
Subjects/Keywords: Fibre suspension; Multi-phase flow; Nuclear magnetic resonance; Engineering and Technology; Teknik och teknologier
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APA (6th Edition):
Hirota, M. (2013). An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202628
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):
Hirota, Masato. “An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging.” 2013. Thesis, KTH. Accessed March 04, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202628.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hirota, Masato. “An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging.” 2013. Web. 04 Mar 2021.
Vancouver:
Hirota M. An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging. [Internet] [Thesis]. KTH; 2013. [cited 2021 Mar 04].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202628.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hirota M. An Experimental Study of Fibre SuspensionFlows in Pipes using Nuclear MagneticResonance Imaging. [Thesis]. KTH; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202628
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Arizona State University
26.
Mangavelli, Sai Chaitanya.
Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow.
Degree: Mechanical Engineering, 2018, Arizona State University
URL: http://repository.asu.edu/items/49044
► This thesis focuses on studying the interaction between floating objects and an air-water flow system driven by gravity. The system consists of an inclined channel…
(more)
▼ This thesis focuses on studying the interaction
between floating objects and an air-water flow system driven by
gravity. The system consists of an inclined channel in which a
gravity driven two phase flow carries a series of floating solid
objects downstream. Numerical simulations of such a system requires
the solution of not only the basic Navier-Stokes equation but also
dynamic interaction between the solid body and the two-phase flow.
In particular, this requires embedding of dynamic mesh within the
two-phase flow. A computational fluid dynamics solver, ANSYS fluent,
is used to solve this problem. Also, the individual components for
these simulations are already available in the solver, few examples
exist in which all are combined. A series of simulations are
performed by varying the key parameters, including density of
floating objects and mass flow rate at the inlet. The motion of the
floating objects in those simulations are analyzed to determine the
stability of the coupled flow-solid system. The simulations are
successfully performed over a broad range of parametric values. The
numerical framework developed in this study can potentially be used
in applications, especially in assisting the design of similar
gravity driven systems for transportation in manufacturing
processes. In a small number of the simulations, two kinds of
numerically instability are observed. One is characterized by a
sudden vertical acceleration of the floating object due to a strong
imbalance of the force acting on the body, which occurs when the
mass flow of water is weak. The other is characterized by a sudden
vertical movement of air-water interface, which occurs when two
floating objects become too close together. These new types of
numerical instability deserve future studies and clarifications.
This study is performed only for a 2-D system. Extension of the
numerical framework to a full 3-D setting is recommended as future
work.
Subjects/Keywords: Fluid mechanics; Computational physics; Dynamic mesh; Floating objects; Multi-phase flow; Numerical simulation
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APA (6th Edition):
Mangavelli, S. C. (2018). Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/49044
Chicago Manual of Style (16th Edition):
Mangavelli, Sai Chaitanya. “Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow.” 2018. Masters Thesis, Arizona State University. Accessed March 04, 2021.
http://repository.asu.edu/items/49044.
MLA Handbook (7th Edition):
Mangavelli, Sai Chaitanya. “Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow.” 2018. Web. 04 Mar 2021.
Vancouver:
Mangavelli SC. Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow. [Internet] [Masters thesis]. Arizona State University; 2018. [cited 2021 Mar 04].
Available from: http://repository.asu.edu/items/49044.
Council of Science Editors:
Mangavelli SC. Numerical Simulation of the Interaction Between Floating
Objects and a Gravity Driven Flow. [Masters Thesis]. Arizona State University; 2018. Available from: http://repository.asu.edu/items/49044
27.
Jin, Kai.
Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations.
Degree: PhD, Mechanical Engineering, 2016, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/95333
► Continuous casting produces over 95% of steel in the world today, hence even small improvements to this important industrial process can have large economic impact.…
(more)
▼ Continuous casting produces over 95% of steel in the world today, hence even small improvements to this important industrial process can have large economic impact. In the continuous casting of steel process, argon gas is usually injected at the slide gate or stopper rod to prevent clogging, but entrapped bubbles may cause defects in the final product. Many defects in this process are related to the transient fluid
flow in the mold region of the caster. Electromagnetic braking (EMBr) device is often used at high casting speed to modify the mold
flow, reduce the surface velocity and fluctuation. This work studies the physics in continuous casting process including effects of EMBr on the motion of fluid
flow in the mold region, and transport and capture of bubbles in the solidification processes. A computational effective Reynolds-averaged Navier-Stokes (RANS) model and a high fidelity Large Eddy Simulation (LES) model are used to understand the motion of the molten steel
flow. A general purpose
multi-GPU Navier-Stokes solver, CUFLOW, is developed. A Coherent-Structure Smagorinsky LES model is implemented to model the turbulent
flow. A two-way coupled Lagrangian particle tracking model is added to track the motion of argon bubbles. A particle/bubble capture model based on force balance at dendrite tips is validated and used to study the capture of argon bubbles by the solidifying steel shell. To investigate the effects of EMBr on the turbulent molten steel
flow and bubble transport, an electrical potential method is implemented to solve the magnetohydrodynamics equations. Volume of Fluid (VOF) simulations are carried out to understand the additional resistance force on moving argon bubbles caused by adding transverse magnetic field. A modified drag coefficient is extrapolated from the results and used in the two-way coupled Eulerian-Lagrangian model to predict the argon bubble transport in a caster with EMBr. A hook capture model is developed to understand the effects of hooks on argon bubble capture.
Advisors/Committee Members: Thomas, Brian G (advisor), Vanka, Surya P (advisor), Thomas, Brian G (Committee Chair), Vanka, Surya P (Committee Chair), Ruzic, David N (committee member), Brooks, Caleb (committee member), Smith, Kyle C (committee member).
Subjects/Keywords: Computational fluid dynamics (CFD); Multi-GPU Computing; Continuous Casting; Two-phase flow; Electromagnetic Braking
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APA (6th Edition):
Jin, K. (2016). Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95333
Chicago Manual of Style (16th Edition):
Jin, Kai. “Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 04, 2021.
http://hdl.handle.net/2142/95333.
MLA Handbook (7th Edition):
Jin, Kai. “Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations.” 2016. Web. 04 Mar 2021.
Vancouver:
Jin K. Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2142/95333.
Council of Science Editors:
Jin K. Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95333
Texas Tech University
28.
Mishra, Columbia.
Efficient analysis of general creeping motion of a sphere inside a cylinder.
Degree: Mechanical Engineering, 2008, Texas Tech University
URL: http://hdl.handle.net/2346/13651
► Creeping motion of a sphere in viscous fluid bounded by a cylindrical surface is crucial in many physical and physiological processes. In this thesis, I…
(more)
▼ Creeping motion of a sphere in viscous fluid bounded by a cylindrical surface is crucial in many physical and physiological processes. In this thesis, I describe a very efficient method to comprehensively solve a classical
flow problem involving suspended colloidal particle inside a conduit. A general solution technique is proposed to determine the hydrodynamic interactions between such spherical particle and cylindrical confinement.
In order to efficiently solve the Stokesian
flow-field around a sphere inside a cylinder, we formulate a general mathematical procedure which can be used to find reflection relations for a vector field at simple surfaces. Unlike other recently developed efficient algorithms, the present technique does not require any translational symmetry. The method is based on the expansion of a vector field in terms of general separable basis functions. It enables us to solve a second order linear vector equation with specified conditions at disconnected bodies defined by planar, cylindrical and spherical boundaries. Thus, one can extend the outlined methodology to describe multiparticle hydrodynamic interactions in a cylinder or an annulus.
The main focus of this article is to provide a complete description of the dynamics of a spherical particle in a cylindrical vessel. For this purpose, we consider motion of the sphere in both quiescent fluid and pressure-driven parabolic
flow. First, we determine the force and torque on a translating-rotating particle in quiescent fluid in terms of general friction coefficients. Then we assume an impending parabolic
flow, and calculate the force and the torque on a fixed sphere as well as the linear and angular velocities of a freely moving particle. The results are presented for different radial positions of the particle and different ratios between the sphere and the cylinder radius. Because of the generality of the procedure, there is no restriction in relative dimensions, particle-position and direction of motion. For the limiting cases of geometric parameters, our results agree with the ones obtained by past researchers using different asymptotic methods.
Advisors/Committee Members: Bhattacharya, Sukalyan (Committee Chair), Pantoya, Michelle (committee member), Khare, Rajesh (committee member).
Subjects/Keywords: Multi-phase flow; Colloidal dynamics; Multiparticle
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Manager
APA (6th Edition):
Mishra, C. (2008). Efficient analysis of general creeping motion of a sphere inside a cylinder. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/13651
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):
Mishra, Columbia. “Efficient analysis of general creeping motion of a sphere inside a cylinder.” 2008. Thesis, Texas Tech University. Accessed March 04, 2021.
http://hdl.handle.net/2346/13651.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mishra, Columbia. “Efficient analysis of general creeping motion of a sphere inside a cylinder.” 2008. Web. 04 Mar 2021.
Vancouver:
Mishra C. Efficient analysis of general creeping motion of a sphere inside a cylinder. [Internet] [Thesis]. Texas Tech University; 2008. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2346/13651.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mishra C. Efficient analysis of general creeping motion of a sphere inside a cylinder. [Thesis]. Texas Tech University; 2008. Available from: http://hdl.handle.net/2346/13651
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
29.
He, Ping.
Fluid Dynamics of Cell Printing.
Degree: PhD, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/727
► Cell printing is an emerging technology that uses droplets to deliver cells to desired positions with resolution potentially comparable to the size of single…
(more)
▼ Cell printing is an emerging technology that uses droplets to deliver cells to desired positions with resolution potentially comparable to the size of single cells. In particular, ink–jet based cell printing technique has been successfully used to build simple bio–constructs and has shown a promise in building complex bio–structures or even organs. Two important issues in ink–jet based cell printing are the moderate survival rate of delicate cells and the limited cell placement resolution. Resolving these issues is critical for the ink–jet based cell printing techniques to realize their full potential. In this work, we use numerical simulations to reconstruct the impact of a droplet loaded with a single cell onto a pool of viscous fluids to gain insights into the droplet and cell dynamics during cell printing. We developed a mathematical model for this process: the droplet, pool and air are modeled as Newtonian fluids, and their
flow is modeled as a laminar
flow governed by the Navier–Stokes equation. The cell is modeled as an axisymmetric solid object governed by the neo–Hookean law and also has a shear viscosity that is the same as that of its host droplet. To numerically solve the coupled fluid and cell motion, we used a hybrid method in which fluid
flow is solved on a fixed Cartesian grid and the deformation of solid body is solved on a Lagrangian mesh. We also developed a new full Eulerian method, termed the solid level set (SLS) method, to simulate cell printing. The key idea is to track the deformation of the solid body using four level set functions on a fixed Cartesian grid instead of using a Lagrangian mesh. The SLS method is easy to implement and addresses several challenges in simulations of fluid–tructure interactions using hybrid Eulerian/Lagrangian meshes. Using codes developed based on the above methods, we systematically investigated the fluid and cell dynamics during the cell printing process. We studied how the droplet penetration depth, droplet lateral spreading, cell stress and cell surface area change are affected by printing conditions such as impact velocity, pool depth, and cell stiffness. Our simulations indicate that cell experiences significant stress (∼20kPa) and local surface area dilation (∼100%) during the impact process. The latter suggests that cell membrane is temporally ruptured during the printing process, and is consistent with the gene transfection observed during cell printing. We speculate that the survival of cell through the rather violent cell printing process may be related to the briefness of the impact process, which only lasts about 0.1 milliseconds. Based on our simulation results, several strategies have been proposed to reduce the stress and membrane dilation of cells during cell printing.
Advisors/Committee Members: Qiao, Rui, Tong , Chenning, Miller , Richard S, Zumbrunnen , David A.
Subjects/Keywords: cell printing; computational fluid dynamics; droplet impact; fluid struture interactions; multi-phase flow; Mechanical Engineering
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Manager
APA (6th Edition):
He, P. (2011). Fluid Dynamics of Cell Printing. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/727
Chicago Manual of Style (16th Edition):
He, Ping. “Fluid Dynamics of Cell Printing.” 2011. Doctoral Dissertation, Clemson University. Accessed March 04, 2021.
https://tigerprints.clemson.edu/all_dissertations/727.
MLA Handbook (7th Edition):
He, Ping. “Fluid Dynamics of Cell Printing.” 2011. Web. 04 Mar 2021.
Vancouver:
He P. Fluid Dynamics of Cell Printing. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Mar 04].
Available from: https://tigerprints.clemson.edu/all_dissertations/727.
Council of Science Editors:
He P. Fluid Dynamics of Cell Printing. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/727
30.
Ben Dhia, Zakaria.
Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
.
Degree: 2016, University of Ottawa
URL: http://hdl.handle.net/10393/34924
► This study entails an investigation of a novel moment closure, originally constructed for rarefied-gas prediction, to the modelling of inert, dilute, disperse, particle flows. Such…
(more)
▼ This study entails an investigation of a novel moment closure, originally constructed for rarefied-gas prediction, to the modelling of inert, dilute, disperse, particle flows. Such flows are important in many engineering situations. As one example, in internal-combustion engines, fuel is often injected as a spray of tiny droplets and, during combustion, a cloud of tiny soot particles can be formed. These particle phases are often difficult to model, especially when particles display a range of velocities at each location in space. Lagrangian methods are often too costly and many Eulerian field-based methods suffer from model deficiencies and mathematical artifacts. Often, Eulerian formulations assume that all particles at a location and time have the same velocity. This assumption leads to nonphysical
results, including an inability to predict particle paths crossing and a limited number of boundary conditions that can be applied.
The typical multi-phase situation of many particles is, in many ways, similar to that
of a gas compressed of a huge number of atoms or molecules. It is therefore expected that powerful techniques from the kinetic theory of gases could be applied. This work explores the advantages of using a modern fourteen-moment model, originally derived for rarefied gases, to predict multi-phase flows. Details regarding the derivation, the mathematical structure, and physical behaviour of the resulting model are explained. Finally, a numerical implementation is presented and results for several flow problems that are designed to demonstrate the fundamental behaviour of the models are presented. Comparisons are made with other classical models.
Subjects/Keywords: Multi-phase Flow;
Kinetic Theory
…the multi-phase
flow occurring in the engine is necessary.
Multi-phase flows are omnipresent… …Hierarchy of models for multi-phase flow prediction
2
DQMOM
to model multi-phase flow. We… …commonly used and available in many multi-phase flow solvers.
Another model, originally derived… …improve the accuracy of the predictions for multi-phase flow. Up to now,
this model has only… …been applied to pure gas flow. This work represents its first application
to multi-phase flow…
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APA (6th Edition):
Ben Dhia, Z. (2016). Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/34924
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):
Ben Dhia, Zakaria. “Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
.” 2016. Thesis, University of Ottawa. Accessed March 04, 2021.
http://hdl.handle.net/10393/34924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ben Dhia, Zakaria. “Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
.” 2016. Web. 04 Mar 2021.
Vancouver:
Ben Dhia Z. Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
. [Internet] [Thesis]. University of Ottawa; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10393/34924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ben Dhia Z. Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory
. [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/34924
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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