subject:(Critical Heat Flux)

Virginia Tech

1. Thompson, Jordan Lee. Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux.

Degree: MS, Mechanical Engineering, 2013, Virginia Tech

URL: http://hdl.handle.net/10919/23091

► A novel method for measuring heat flux of boiling water is designed and built to study critical heat flux (CHF) and observe the response of… (more)

Subjects/Keywords: heat flux sensor; boiling; critical heat flux

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Thompson, J. L. (2013). Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/23091

Chicago Manual of Style (16^th Edition):

Thompson, Jordan Lee. “Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux.” 2013. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/23091.

MLA Handbook (7^th Edition):

Thompson, Jordan Lee. “Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux.” 2013. Web. 24 Jan 2021.

Vancouver:

Thompson JL. Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/23091.

Council of Science Editors:

Thompson JL. Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/23091

University of Houston

2. Lu, Yi. Electrowetting Enhancement of Critical Heat Flux.

Degree: PhD, Mechanical Engineering, 2017, University of Houston

URL: http://hdl.handle.net/10657/4614

► Critical heat flux (CHF) represents the upper limit of nucleate boiling heat transfer, beyond which boiling transitions to the inefficient film boiling regime. Potentially catastrophic… (more)

▼ Critical heat flux (CHF) represents the upper limit of nucleate boiling heat transfer, beyond which boiling transitions to the inefficient film boiling regime. Potentially catastrophic burnout conditions may ensue and endanger the safe and reliable operation of the boiling device. Thus, it is highly desirable to augment CHF in order to boost the thermal performance of various energy-intensive applications that rely on boiling to transport a large amount of thermal energy. In this work, CHF enhancement was explored both theoretically and experimentally by capitalizing on the ability of electrowetting (EW) to modulate the liquid-vapor interfacial stabilities and the liquid-vapor-solid three-phase contact line motion. To do so, a Leidenfrost drop (i.e., a liquid drop hovering over a highly superheated solid surface) was first employed as a model system, due to its simplicity and close connection to film boiling and CHF, to investigate the effect of the electric field on the dynamics of the vapor film that separates the drop from the hot surface. It was found that the electrostatic attraction force alone cannot destabilize the vapor film, instead, it is the accelerated vapor flow that changes the critical wavelength of the Kelvin-Helmholtz instability, thus causing the film to collapse. The results show that, without the need for any complicated surface micro/nanostructures, the Leidenfrost point (LFP) temperature of water can be increased from 200°C to 380°C with a moderate voltage of 56 V a frequency of 50 Hz. Subsequently, to better understand the impact of EW on the liquid-vapor interfacial behaviors, the dynamics of EW-induced motion of both liquid droplets and vapor bubbles was studied. Computational fluid dynamics models were developed by using the Volume of Fluid (VOF)-Continuous Surface Force (CSF) method to scrutinize the response of a droplet when subject to EW actuating signals. In particular, a dynamic contact angle model based on the molecular kinetic theory was implemented as the boundary condition at the moving contact line, which considers the effects of both the contact line friction and the pinning force. The droplet shape evolution and the interfacial resonance oscillation were investigated in detail. On the bubble aspect, the nucleation, growth and departure of vapor bubbles on a hydrophilic surface, a hydrophobic surface both with and without the influence of EW, were compared, which revealed the significant effect of the EW force on the contact line and, therefore, on the bubble dynamics. Lastly, to demonstrate the EW enhancement of CHF, a synchronized high-speed optical imaging and infrared (IR) thermographic technique was used to characterize boiling heat transfer at the CHF conditions. Simultaneous measurements of the bubble dynamics and the wall temperature and heat flux distributions on the boiling surface were acquired. The results showed that CHF can be enhanced by 133% by the use of EW. Additionally, by considering the force balance at the contact line of a nucleate… Advisors/Committee Members: Liu, Dong (advisor), Ruchhoeft, Paul (committee member), Mavrokefalos, Anastassios (committee member), Ghasemi, Hadi (committee member), Yu, Cunjiang (committee member).

Subjects/Keywords: Electrowetting; Critical heat flux; Boiling

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APA (6^th Edition):

Lu, Y. (2017). Electrowetting Enhancement of Critical Heat Flux. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4614

Chicago Manual of Style (16^th Edition):

Lu, Yi. “Electrowetting Enhancement of Critical Heat Flux.” 2017. Doctoral Dissertation, University of Houston. Accessed January 24, 2021. http://hdl.handle.net/10657/4614.

MLA Handbook (7^th Edition):

Lu, Yi. “Electrowetting Enhancement of Critical Heat Flux.” 2017. Web. 24 Jan 2021.

Vancouver:

Lu Y. Electrowetting Enhancement of Critical Heat Flux. [Internet] [Doctoral dissertation]. University of Houston; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10657/4614.

Council of Science Editors:

Lu Y. Electrowetting Enhancement of Critical Heat Flux. [Doctoral Dissertation]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4614

McMaster University

3. BEHDADI, AZIN. MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES.

Degree: PhD, 2015, McMaster University

URL: http://hdl.handle.net/11375/18045

►

Heavy water moderator surrounding each fuel channel is one of the important safety features in CANDU reactors since it provides an in-situ passive heat sink… (more)

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Heavy water moderator surrounding each fuel channel is one of the important safety features in CANDU reactors since it provides an in-situ passive heat sink for the fuel in situations where other engineered means of heat removal from fuel channels have failed. In a critical break LOCA scenario, fuel cooling becomes severely degraded due to rapid flow reduction in the affected flow pass of the heat transport system. This can result in pressure tubes experiencing significant heat-up during early stages of the accident when coolant pressure is still high, thereby causing uniform thermal creep strain (ballooning) of the pressure tube (PT) into contact with its calandria tube (CT). The contact of the hot PT with the CT causes rapid redistribution of stored heat from the PT to CT and a large heat flux spike from the CT to the moderator fluid. For conditions where subcooling of the moderator fluid is low, this heat flux spike can cause dryout of the CT. This can detrimentally affect channel integrity if the CT post-dryout temperature becomes sufficiently high to result in continued thermal creep strain deformation of both the PT and the CT. A comprehensive mechanistic model is developed to predict the critical heat flux (CHF) variations along the downward facing outer surface of calandria tube. The model is based on the hydrodynamic model of which considers a liquid macrolayer beneath an elongated vapor slug on the heated surface. Local dryout is postulated to occur whenever the fresh liquid supply to the macrolayer is not sufficient to compensate for the liquid depletion within the macrolayer due to boiling on the heating surface. A boundary layer analysis is performed, treating the two phase motion as an external buoyancy driven flow, to determine the liquid supply rate and the local CHF. The model takes into account different types of flow regime or slip ratio. It is applicable for a calandria vessel as well, under a sever accident condition where a thermal creep failure is postulated to occur if sustained CHF is instigated in the surrounding shield tank water. Model shows good agreement with the available experimental CHF data. The model has been modified to take into account the effect of subcooling and has been validated against the empirical correction factors.

Dissertation

Doctor of Philosophy (PhD)

Advisors/Committee Members: LUXAT, JOHN C., Engineering Physics and Nuclear Engineering.

Subjects/Keywords: CRITICAL HEAT FLUX; TWO PHASE FLOW

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APA (6^th Edition):

BEHDADI, A. (2015). MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/18045

Chicago Manual of Style (16^th Edition):

BEHDADI, AZIN. “MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES.” 2015. Doctoral Dissertation, McMaster University. Accessed January 24, 2021. http://hdl.handle.net/11375/18045.

MLA Handbook (7^th Edition):

BEHDADI, AZIN. “MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES.” 2015. Web. 24 Jan 2021.

Vancouver:

BEHDADI A. MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES. [Internet] [Doctoral dissertation]. McMaster University; 2015. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11375/18045.

Council of Science Editors:

BEHDADI A. MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES. [Doctoral Dissertation]. McMaster University; 2015. Available from: http://hdl.handle.net/11375/18045

Rochester Institute of Technology

4. Jaikumar, Arvind. Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications.

Degree: PhD, Microsystems Engineering, 2017, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/9636

► The advent of cloud computing and the complex packaging architecture of next generation electronic devices drives methods for advanced thermal management solutions. Convection based… (more)

▼ The advent of cloud computing and the complex packaging architecture of next generation electronic devices drives methods for advanced thermal management solutions. Convection based single-phase cooling systems are inefficient due to their large pressure drops, fluid temperature differences and costs, and are incapable of meeting the cooling requirements in the high power density components and systems. Alternatively, phase-change cooling techniques are attractive due to their ability to remove large amounts of heat while maintaining uniform fluid temperatures. Pool boiling heat transfer mechanism centers on the nucleation, growth and departure of a bubble from the heat transfer surface in a stagnant pool of liquid. The pool boiling performance is quantified by the Critical Heat Flux (CHF) and Heat Transfer Coefficients (HTC) which dictate the operating ranges and efficiency of the heat transfer process. In this work, three novel geometries are introduced to modify the nucleation characteristics, liquid pathways and contact line motion on the prime heater surface for a simultaneous increase in CHF and HTC. First, sintered microchannels and nucleating region with feeder channels (NRFC) were developed through the mechanistic concept of separate liquid-vapor pathways and enhanced macroconvection heat transfer. A maximum CHF of 420 W/cm2 at a wall superheat of 1.7 °C with a HTC of 2900 MW/m2°C was achieved with the sintered-channels configuration, while the NRFC reached a CHF of 394 W/cm2 with a HTC of 713 kW/m2°C. Second, the scale effect of liquid wettability, roughness and microlayer evaporation was exploited to facilitate capillary wicking in graphene through interlaced porous copper particles. A CHF of 220 W/cm2 with a HTC of 155 kW/m2°C was achieved using an electrodeposition coating technique. Third, the chemical heterogeneity on nanoscale coatings was shown to increase the contribution from transient conduction mechanisms. A maximum CHF of 226 W/cm2 with a HTC of 107 kW/m2°C was achieved. The enhancement techniques developed here provide a mechanistic tool at the microscale and nanoscale to increase the boiling CHF and HTC. Advisors/Committee Members: Satish G. Kandlikar.

Subjects/Keywords: Boiling; Critical heat flux; Enhancement; Heat transfer coefficient; Thermal management

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APA (6^th Edition):

Jaikumar, A. (2017). Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications. (Doctoral Dissertation). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/9636

Chicago Manual of Style (16^th Edition):

Jaikumar, Arvind. “Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications.” 2017. Doctoral Dissertation, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/9636.

MLA Handbook (7^th Edition):

Jaikumar, Arvind. “Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications.” 2017. Web. 24 Jan 2021.

Vancouver:

Jaikumar A. Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications. [Internet] [Doctoral dissertation]. Rochester Institute of Technology; 2017. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/9636.

Council of Science Editors:

Jaikumar A. Multiscale Mechanistic Approach to Enhance Pool Boiling Performance for High Heat Flux Applications. [Doctoral Dissertation]. Rochester Institute of Technology; 2017. Available from: https://scholarworks.rit.edu/theses/9636

Rochester Institute of Technology

5. Raghupathi, Pruthvik A. On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling.

Degree: PhD, Engineering, 2018, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/9849

► Rapid advancement of electronics used in domestic, commercial and military applications has necessitated the development of thermal management solutions capable of dissipating large amounts… (more)

▼ Rapid advancement of electronics used in domestic, commercial and military applications has necessitated the development of thermal management solutions capable of dissipating large amounts of heat in a reliable and efficient manner. Traditional methods of cooling, including air and liquid cooling, require large fluid flow rates and temperature differences to remove high heat fluxes and are therefore unsuited for many advanced applications. Phase change heat transfer, specifically boiling, is capable of dissipating large heat fluxes with low temperature gradients and hence is an attractive technique for cooling high heat flux applications. However, due to the complex interactions between the fluid dynamics, heat transfer, and surface chemistry, the fundamental physics associated with boiling is not completely understood. The focus of this work is to get a better understanding of the role played by a nucleating bubble in removing the heat from the substrate. The interfacial forces acting on a bubble, contact line motion, and the thermal interaction with the heater surfaces are some of the important considerations which have not been well understood in literature. The work reported in this dissertation is divided into three parts. In the first part, an analytical study of the effect of evaporation momentum force on bubble growth rate and bubble trajectory was conducted. It was shown that the trajectory of a bubble can be controlled by creating an asymmetric temperature field. This understanding was used to develop a bubble diverter that increased the Critical Heat Flux (CHF) over a horizontal tubular surface by 60% and improved the heat transfer coefficient by 75%. In the second part of the work, additional contact line regions were generated using microgrooves. This enhancement technique increased the CHF with water by 46% over a plain copper surface to 187 W/cm2. Finally, the effect of the heater properties and surface fouling during boiling was evaluated. This included a study on the effect of thermophysical properties of the heater surface on CHF and an investigation of fouling over a heater surface during boiling of seawater. Advisors/Committee Members: Satish G. Kandlikar.

Subjects/Keywords: Boiling; Bubble dynamics; Contact line heat transfer; Critical heat flux; Seawater

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APA (6^th Edition):

Raghupathi, P. A. (2018). On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling. (Doctoral Dissertation). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/9849

Chicago Manual of Style (16^th Edition):

Raghupathi, Pruthvik A. “On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling.” 2018. Doctoral Dissertation, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/9849.

MLA Handbook (7^th Edition):

Raghupathi, Pruthvik A. “On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling.” 2018. Web. 24 Jan 2021.

Vancouver:

Raghupathi PA. On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling. [Internet] [Doctoral dissertation]. Rochester Institute of Technology; 2018. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/9849.

Council of Science Editors:

Raghupathi PA. On Contact Line Region Heat Transfer, Bubble Dynamics and Substrate Effects during Boiling. [Doctoral Dissertation]. Rochester Institute of Technology; 2018. Available from: https://scholarworks.rit.edu/theses/9849

University of Lund

6. Cao, Zhen. Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling.

Degree: 2019, University of Lund

URL: https://lup.lub.lu.se/record/4476ab29-a1b6-41e6-9446-771360de710c ; https://portal.research.lu.se/ws/files/70150598/Thesis_Zhen.pdf

► In this thesis, pool boiling heat transfer was experimentally studied on structured surfaces with dielectric liquids (HFE-7200, NOVEC-649, FC-72), organic liquids (Acetone, Pentane) and deionized… (more)

Subjects/Keywords: pool boiling; heat transfer; critical heat flux; bubble dynamics; surface modification

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cao, Z. (2019). Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/4476ab29-a1b6-41e6-9446-771360de710c ; https://portal.research.lu.se/ws/files/70150598/Thesis_Zhen.pdf

Chicago Manual of Style (16^th Edition):

Cao, Zhen. “Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling.” 2019. Doctoral Dissertation, University of Lund. Accessed January 24, 2021. https://lup.lub.lu.se/record/4476ab29-a1b6-41e6-9446-771360de710c ; https://portal.research.lu.se/ws/files/70150598/Thesis_Zhen.pdf.

MLA Handbook (7^th Edition):

Cao, Zhen. “Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling.” 2019. Web. 24 Jan 2021.

Vancouver:

Cao Z. Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling. [Internet] [Doctoral dissertation]. University of Lund; 2019. [cited 2021 Jan 24]. Available from: https://lup.lub.lu.se/record/4476ab29-a1b6-41e6-9446-771360de710c ; https://portal.research.lu.se/ws/files/70150598/Thesis_Zhen.pdf.

Council of Science Editors:

Cao Z. Pool Boiling on Structured Surfaces: Heat Transfer and Critical Heat Flux : -Experiments and Mechanistic Modelling. [Doctoral Dissertation]. University of Lund; 2019. Available from: https://lup.lub.lu.se/record/4476ab29-a1b6-41e6-9446-771360de710c ; https://portal.research.lu.se/ws/files/70150598/Thesis_Zhen.pdf

Rochester Institute of Technology

7. Shukla, Maharshi Y. Influence of Liquid Height on Pool Boiling Heat Transfer.

Degree: MS, Mechanical Engineering, 2020, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/10649

► As technology advances due to continuous research, devices are becoming more compact, efficient, and powerful. Therefore, heat rejection from such devices becomes ever so… (more)

▼ As technology advances due to continuous research, devices are becoming more compact, efficient, and powerful. Therefore, heat rejection from such devices becomes ever so critical to maximizing their potential. Compared to other heat extraction methods, boiling provides one of the highest heat transfer coefficients. The heat extraction due to the boiling process is limited to the Critical Heat Flux (CHF). At CHF, an insulating layer of escaping bubbles forms upon the surface to prevent boiling continuity. Subsequently, the surface temperature increases uncontrollably, leading to a system failure. Hence, the elevation of CHF is critical to boiling enhancement. Improvements to the heat transfer process can be made with either surface manipulation or liquid manipulation. Based on previous studies, it is found that the removal of bubbles from the heater surface is critical to enhancing performance. Therefore, it is hypothesized that if a bubble can be encouraged to reach liquid-gas the interface quickly, gains in the boiling performance can be achieved. Due to the vapor bubble's movement in liquid bulk, it becomes critical to understand the influence of liquid height on pool boiling for enhancement. While pool boiling enhancement using heating surface modification is extensively studied and documented, there is a research gap between understanding the effect of liquid height at high heat fluxes. Thus, this study tries to evaluate the influence of liquid height on pool boiling performance at higher heat fluxes and identify the underlying bubble movement mechanism. It is observed that as CHF increases with liquid height. Moreover, it is observed that bubble movement is more effortless at low liquid height resulting in higher HTC. On the other hand, larger liquid height provides improved rewetting of the surface resulting in higher CHF. Upon analysis of high-speed recording of the escaping bubbles, it was observed that the maximum heat transfer coefficient is observed when the liquid height is about four times the height of the departing bubble diameter. Advisors/Committee Members: Satish Kandlikar.

Subjects/Keywords: Critical heat flux; Heat transfer coefficient; Pool boiling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shukla, M. Y. (2020). Influence of Liquid Height on Pool Boiling Heat Transfer. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/10649

Chicago Manual of Style (16^th Edition):

Shukla, Maharshi Y. “Influence of Liquid Height on Pool Boiling Heat Transfer.” 2020. Masters Thesis, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/10649.

MLA Handbook (7^th Edition):

Shukla, Maharshi Y. “Influence of Liquid Height on Pool Boiling Heat Transfer.” 2020. Web. 24 Jan 2021.

Vancouver:

Shukla MY. Influence of Liquid Height on Pool Boiling Heat Transfer. [Internet] [Masters thesis]. Rochester Institute of Technology; 2020. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/10649.

Council of Science Editors:

Shukla MY. Influence of Liquid Height on Pool Boiling Heat Transfer. [Masters Thesis]. Rochester Institute of Technology; 2020. Available from: https://scholarworks.rit.edu/theses/10649

Penn State University

8. Almudhhi, Turki Khalid. EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14854tka5098

► Quenching experiments of a cylindrical rod were conducted in a distilled water pool in order to study the behavior of the critical heat flux (CHF)… (more)

Subjects/Keywords: Pool boiling; Heat transfer; Quenching; critical heat flux

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APA (6^th Edition):

Almudhhi, T. K. (2017). EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14854tka5098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Almudhhi, Turki Khalid. “EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD.” 2017. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/14854tka5098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Almudhhi, Turki Khalid. “EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD.” 2017. Web. 24 Jan 2021.

Vancouver:

Almudhhi TK. EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/14854tka5098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Almudhhi TK. EXPERIMENTAL STUDY OF HEAT TRANSFER DURING QUENCHING OF A HEATED ROD. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/14854tka5098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Kansas State University

9. Dahariya, Smreeti. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.

Degree: PhD, Department of Mechanical and Nuclear Engineering, 2020, Kansas State University

URL: http://hdl.handle.net/2097/40311

► Boiling has received considerable attention in the technology advancement of electronics cooling for high-performance computing applications. Two-phase cooling has an advantage over a single-phase cooling… (more)

▼ Boiling has received considerable attention in the technology advancement of electronics cooling for high-performance computing applications. Two-phase cooling has an advantage over a single-phase cooling in the high heat removal rate with a small thermal gradient due to the latent heat of vaporization. Many surface modifications have been done in the past including surface roughness, mixed wettability and, porous wick copper play a crucial role in the liquid-vapor phase change heat transfer. However, the mechanisms of high-pressure pool-boiling heat transfer enhancement due to surface modifications has not been well studied or understood. The properties of water, such as the latent heat of vaporization, surface tension, the difference in specific volume of liquid and vapor, decrease at high-pressure. High-pressure pool-boiling heat transfer enhancement is studied fundamentally on various engineered surfaces. The boiling tests are performed at a maximum pressure of 90 psig (620.5 kPa) and then compared to results at 0 psig (0 kPa). The results indicate that the pressure influences the boiling performance through changes in bubble dynamics. The bubble departure diameter, bubble departure frequency, and the active nucleation sites change with pressure. The pool-boiling heat transfer enhancement of a Teflon© coated surface is also experimentally tested, using water as the working fluid. The boiling results are compared with a plain surface at two different pressures, 30 and 45 psig. The maximum heat transfer enhancement is found at the low heat fluxes. At high heat fluxes, a negligible effect is observed in HTC. The primary reasons for the HTC enhancement at low heat fluxes are active nucleation sites at low wall superheat and bubble departure size. The Teflon© coated surface promotes nucleation because of the lower surface energy requirement. The boiling results are also obtained for wick surfaces. The wick surfaces are fabricated using a sintering process. The boiling results are compared with a plain surface. The reasons for enhancements in the pool-boiling performance are primarily due to increased bubble generation, higher bubble release frequency, reduced thermal-hydraulic length modulation, and enhanced thermal conductivity due to the sintered wick layer. The analysis suggests that the Rayleigh-critical wavelength decreases by 4.67 % of varying pressure, which may cause the bubble pinning between the gaps of sintered particles and avoids the bubble coalescence. Changes in the pitch distance indicate that a liquid-vapor phase separation happens at the solid/liquid interface, which impacts the heat-transfer performance significantly. Similarly, the role of the high-pressure over the wicking layer is further analyzed and studied. It is found that the critical flow length, λu reduces by three times with 200 μm particles. The results suggest that the porous wick layer provides a capillary-assist to liquid flow effect, and delays the surface dry out. The surface modification and the pressure amplify the boiling heat… Advisors/Committee Members: Amy R. Betz.

Subjects/Keywords: Critical Heat Flux; Heat Transfer Coefficient; Thermal-Hydraulic; Rayleigh-Critical Wavelength; Pinning Mechanism; Capillary Pressure

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APA (6^th Edition):

Dahariya, S. (2020). High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40311

Chicago Manual of Style (16^th Edition):

Dahariya, Smreeti. “High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.” 2020. Doctoral Dissertation, Kansas State University. Accessed January 24, 2021. http://hdl.handle.net/2097/40311.

MLA Handbook (7^th Edition):

Dahariya, Smreeti. “High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.” 2020. Web. 24 Jan 2021.

Vancouver:

Dahariya S. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. [Internet] [Doctoral dissertation]. Kansas State University; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2097/40311.

Council of Science Editors:

Dahariya S. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. [Doctoral Dissertation]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40311

McMaster University

10. Gocmanac, Marko. Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment.

Degree: MASc, 2011, McMaster University

URL: http://hdl.handle.net/11375/11813

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An experimental investigation of the physical feasibility of thermal creep failure of the Calandria Vessel under a severe accident load is presented in this… (more)

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An experimental investigation of the physical feasibility of thermal creep failure of the Calandria Vessel under a severe accident load is presented in this thesis. Thermal creep failure is postulated to occur if film boiling is instigated in the Shield Tank Water surrounding the Calandria Vessel. The objective of this experimental study is to measure the Critical Heat Flux (CHF) for a representative geometry in environmental conditions similar to those existing in the CANDU Calandria Vessel and Shield Tank Water. Two geometries of downwards facing surfaces are studied. The first is termed the ‘confined’ study in which bubble motion is demarcated to the heated surface. The second is termed the ‘unconfined’ study where individual bubbles are free to move along the heated surface and vent in any direction. The method used in the confined study is novel and involves the placement of a lip surrounding the heated surface. The level of confinement is adjusted by varying the inclination angle. Data has been obtained for Bond Numbers (Bo) 0, 1.5, 3, 3.6 and 11.8 with corresponding qCHF 596, 495, 295, 223, and 187 kW/m2, respectively. A correlation relating the CHF to level of confinement is stated. The CHF results are in good agreement with Theofanous et. al. (1994), as is the observation that a transition angle is observed in the correlation. The transition angle in this study is found to be ~5.5°. The obtained nucleate boiling curves are compared to Su et. al. (2008) data for similar Bo and excellent agreement is achieved in the medium to high heat flux regions. The unconfined study consists of a downward facing plate in a pool of subcooled water. The obtained nucleate boiling curve is compared with the Stephan-Andelsalam correlation and agreement is not observed. There were visibly different trends in the convective heat transfer coefficient with a mean difference of 31%. The experimental data is compared to data obtained by Nishikawa et. al. (1984) and is found to be in acceptable agreement. The power requirement to instigate film boiling was not met, meaning that the CHF is greater than 1 MW/m2. Visual observations are made and an argument is based on the premise that the phenomenon of dryout for a downwards facing surface is similar to that of an upwards facing surface. The theory and current acceptance of CHF for an upwards facing surface is discussed—in particular Zuber’s “Hydrodynamic Limit” of 1.1 MW/m2, Dhir (1992) and recent experimental evidence from Theofanous et. al. (2002). These three studies were found to be in agreement with results presented here. The experimental evidence presented herein supports the statement that thermal creep failure of the Calandria Vessel is physically unreasonable under analyzed severe accident loads.

Master of Applied Science (MASc)

Advisors/Committee Members: Luxat, John C., Novog, David, Novog, David, Engineering Physics.

Subjects/Keywords: Critical Heat Flux Pool Boiling; Heat Transfer, Combustion; Nuclear Engineering; Heat Transfer, Combustion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gocmanac, M. (2011). Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/11813

Chicago Manual of Style (16^th Edition):

Gocmanac, Marko. “Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment.” 2011. Masters Thesis, McMaster University. Accessed January 24, 2021. http://hdl.handle.net/11375/11813.

MLA Handbook (7^th Edition):

Gocmanac, Marko. “Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment.” 2011. Web. 24 Jan 2021.

Vancouver:

Gocmanac M. Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment. [Internet] [Masters thesis]. McMaster University; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11375/11813.

Council of Science Editors:

Gocmanac M. Critical Heat Flux for a Downwards Facing Disk in a Subcooled Pool Boiling Environment. [Masters Thesis]. McMaster University; 2011. Available from: http://hdl.handle.net/11375/11813

NSYSU

11. Liu, Hao-hsiang. Spray Heat Transfer with Different Nanofluids.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426

► This study aims to establish a spray cooling system with nanofluids and investigate its heat transfer performance. In previous study of spray cooling, nozzle diameter… (more)

Subjects/Keywords: nanofluid; spray cooling; cooling curve; boiling curve; critical heat flux

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APA (6^th Edition):

Liu, H. (2015). Spray Heat Transfer with Different Nanofluids. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Hao-hsiang. “Spray Heat Transfer with Different Nanofluids.” 2015. Thesis, NSYSU. Accessed January 24, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Hao-hsiang. “Spray Heat Transfer with Different Nanofluids.” 2015. Web. 24 Jan 2021.

Vancouver:

Liu H. Spray Heat Transfer with Different Nanofluids. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Jan 24]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu H. Spray Heat Transfer with Different Nanofluids. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

12. Lin, Jhen. Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2018, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448

► This experiment mainly discusses the twin-fluid nozzle with the diameter of 1.6 mm by changing different experimental parameters, such as the spray height (H=40 mm,… (more)

Subjects/Keywords: Twin-fluid nozzle; Spray cooling; Critical heat flux; Î¼PIV; IPI

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APA (6^th Edition):

Lin, J. (2018). Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Jhen. “Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.” 2018. Thesis, NSYSU. Accessed January 24, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Jhen. “Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.” 2018. Web. 24 Jan 2021.

Vancouver:

Lin J. Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. [Internet] [Thesis]. NSYSU; 2018. [cited 2021 Jan 24]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin J. Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. Morovati, Mostafa. Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications.

Degree: Master of Engineering (M.E.), Mechanical Engineering, 2011, City University of New York

URL: https://academicworks.cuny.edu/cc_etds_theses/54

► "Pool boiling experiments have been conducted with self-rewetting fluids consisting of aqueous butanol and pentanol solution to study the boiling heat transfer enhancement at pressures… (more)

Subjects/Keywords: Aqueous Solutions; Critical heat flux; pressure; Engineering; Mechanical Engineering

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APA (6^th Edition):

Morovati, M. (2011). Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications. (Thesis). City University of New York. Retrieved from https://academicworks.cuny.edu/cc_etds_theses/54

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Morovati, Mostafa. “Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications.” 2011. Thesis, City University of New York. Accessed January 24, 2021. https://academicworks.cuny.edu/cc_etds_theses/54.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Morovati, Mostafa. “Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications.” 2011. Web. 24 Jan 2021.

Vancouver:

Morovati M. Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications. [Internet] [Thesis]. City University of New York; 2011. [cited 2021 Jan 24]. Available from: https://academicworks.cuny.edu/cc_etds_theses/54.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Morovati M. Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications. [Thesis]. City University of New York; 2011. Available from: https://academicworks.cuny.edu/cc_etds_theses/54

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Univerzitet u Beogradu

14. Pezo, Milada L. Numerička simulacija krize ključanja u isparivačkim cevima.

Degree: Mašinski fakultet, 2013, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/get

►

Mašinstvo - Termoenergetika / Mechanical engineering - Thermal energetics

Predmet ovog rada je numerička simulacija i analiza trodimenzionalnog dvofaznog strujanja i istraživanje mehanizama krize ključanja… (more)

Subjects/Keywords: boiling; critical heat flux; boiling crises; numerical simulation

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APA (6^th Edition):

Pezo, M. L. (2013). Numerička simulacija krize ključanja u isparivačkim cevima. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pezo, Milada L. “Numerička simulacija krize ključanja u isparivačkim cevima.” 2013. Thesis, Univerzitet u Beogradu. Accessed January 24, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pezo, Milada L. “Numerička simulacija krize ključanja u isparivačkim cevima.” 2013. Web. 24 Jan 2021.

Vancouver:

Pezo ML. Numerička simulacija krize ključanja u isparivačkim cevima. [Internet] [Thesis]. Univerzitet u Beogradu; 2013. [cited 2021 Jan 24]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pezo ML. Numerička simulacija krize ključanja u isparivačkim cevima. [Thesis]. Univerzitet u Beogradu; 2013. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

15. Bottini, Joseph Larkin. Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling.

Degree: MS, Nuclear, Plasma, Radiolgc Engr, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/101070

► The critical heat flux (CHF) marks the upper limit of safe operation of heat transfer systems that utilize two-phase boiling heat transfer. In a heat-flux-controlled… (more)

▼ The critical heat flux (CHF) marks the upper limit of safe operation of heat transfer systems that utilize two-phase boiling heat transfer. In a heat-flux-controlled system, exceeding the CHF results in rapid temperature excursions which can be catastrophic for system components. In nuclear power generation, the initiation of a CHF event may cause fuel damage through fuel melting or through zircaloy oxidation. CHF marks the upper limit for safe reactor operation in light-water reactor systems. The understanding of the physical triggering mechanisms for CHF and the accurate prediction of CHF values is important not only for safe reactor operation, but also for efficient plant design and effective fuel utilization. Gamma radiation present in commercial nuclear reactors may affect the surface wettability of fuel rods through the Radiation Induced Surface Activation (RISA) effect, and present power limits on nuclear reactors may be underestimated. Recent studies have focused on the influence of surface wettability on the departure from nucleate boiling (DNB) through surface modifications and coatings, though many of these studies are limited to pool boiling systems. In this thesis, the surface wettability influence is studied on the boiling curves and specifically the point of DNB. A femtosecond laser is used to texture the surface to change the wettability from hydrophilic to hydrophobic. A parametric study is performed with mass flux, pressure, and inlet subcooling in a vertical rectangular channel that is heated from one side. CHF excursions are triggered under various system conditions and are compared with existing models. For the experimental conditions considered, the hydrophobic surface showed delayed onset of nucleate boiling compared to the hydrophilic surface, shifting the boiling curves to higher wall superheat. The hydrophobic surface also showed significantly lower CHF for the same system conditions and less sensitivity to changes in subcooling. Few models accurately predicted the initiation of CHF, and a more conservative model is needed that more accurately incorporates the effect of surface wettability. Advisors/Committee Members: Brooks, Caleb S (advisor), Kozlowski, Tomasz (committee member).

Subjects/Keywords: Critical Heat Flux; Wettability; Flow Boiling; Departure from Nucleate Boiling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bottini, J. L. (2018). Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101070

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bottini, Joseph Larkin. “Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed January 24, 2021. http://hdl.handle.net/2142/101070.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bottini, Joseph Larkin. “Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling.” 2018. Web. 24 Jan 2021.

Vancouver:

Bottini JL. Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2142/101070.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bottini JL. Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101070

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley

16. Lu, Ming-Chang. Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures.

Degree: Mechanical Engineering, 2010, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/5rf0n0cq

► This dissertation presents a study exploring the limits of phase-change heat transfer with the aim of enhancing critical heat flux (CHF) in pool boiling and… (more)

▼ This dissertation presents a study exploring the limits of phase-change heat transfer with the aim of enhancing critical heat flux (CHF) in pool boiling and enhancing thermal conductance in heat pipes. The state-of-the-art values of the CHF in pool boiling and the thermal conductance in heat pipes are about two orders of magnitudes smaller than the limits predicted by kinetic theory. Consequently, there seems to be plenty of room for improvement. Pool boiling refers to boiling at a surface immersed in an extensive motionless pool of liquid. Its process includes heterogeneous nucleation, growth, mergence and detachment of vapor bubbles on a heating surface. It is generally agreed that the high heat transfer coefficient of boiling could be explained by the concept of single-phase forced convection, i.e., the motion of bubbles agitating surrounding liquid is similar to the process in single-phase forced convection. The occurrence of CHF results from a formation of a vapor film on the heater surface, which reduces the thermal conductance drastically and causes a huge temperature rise on the surface. Over the past few decades, researchers were struggling to identify the exact mechanism causing CHF. General observations are that both surface properties and pool hydrodynamics could affect the values of CHF. Nanowire array-coated surfaces having a large capillary force are employed to enhance the CHF. It has been shown that CHFs on the nanowire array-coated surface could be doubled compared to the values on a plain surface. The obtained CHF of 224 ± 6.60 W/cm² on the nanowire-array coated surface is one of the highest values reported in the boiling heat transfer. To further enhance CHF, the mechanisms that govern CHF have been systematically explored. Experimental results show that the CHF on the nanowire array-coated surface are not limited by the capillary force. Instead, the CHF are dependent on the heater size. Corresponding experiments on plain surfaces with various heater sizes also exhibits similar heater-size dependence. The CHFs on nanowire array-coated surfaces and plain surfaces are consistent with the predictions of the hydrodynamic theory while a higher CHF is obtained on the nanowire array-coated surface as compared to the plain Si surface. This suggests that the CHFs are a result of the pool hydrodynamics while surface properties modify the corresponding hydrodynamic limits. A heat pipe is a device that transports thermal energy in a very small temperature difference and thereby producing a very large thermal conductance. It relies on evaporation of liquid at the heated end of the pipe, flow of vapor between the heated and cooled end, condensation at the other end, and capillary-driven liquid flow through a porous wick between the condenser and the evaporation. The large latent heat involved in evaporation and condensation leads to very large heat flows for a small temperature drop along the heat pipe. Despite the large thermal conductance, their operation is limited by such factors as capillary…

Subjects/Keywords: Mechanical Engineering; Critical Heat Flux; Heat Pipe; Nano Wires; Pool Boiling; Wick

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lu, M. (2010). Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/5rf0n0cq

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lu, Ming-Chang. “Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures.” 2010. Thesis, University of California – Berkeley. Accessed January 24, 2021. http://www.escholarship.org/uc/item/5rf0n0cq.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lu, Ming-Chang. “Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures.” 2010. Web. 24 Jan 2021.

Vancouver:

Lu M. Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures. [Internet] [Thesis]. University of California – Berkeley; 2010. [cited 2021 Jan 24]. Available from: http://www.escholarship.org/uc/item/5rf0n0cq.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lu M. Exploring the Limits of Boiling and Evaporative Heat Transfer Using Micro/Nano Structures. [Thesis]. University of California – Berkeley; 2010. Available from: http://www.escholarship.org/uc/item/5rf0n0cq

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley

17. Armijo, Kenneth Miguel. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects.

Degree: Mechanical Engineering, 2011, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/0f86g1pf

► This research investigates the impact of Marangoni phenomena, with low mixture concentrations of alcohol and water, to enhance thermal transport capability of gravity-assisted heat pipes.… (more)

Subjects/Keywords: Engineering; Energy; Chemical engineering; Critical Heat Flux; Heat Pipes; Marangoni Effects; Solar Energy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Armijo, K. M. (2011). Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/0f86g1pf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Armijo, Kenneth Miguel. “Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects.” 2011. Thesis, University of California – Berkeley. Accessed January 24, 2021. http://www.escholarship.org/uc/item/0f86g1pf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Armijo, Kenneth Miguel. “Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects.” 2011. Web. 24 Jan 2021.

Vancouver:

Armijo KM. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects. [Internet] [Thesis]. University of California – Berkeley; 2011. [cited 2021 Jan 24]. Available from: http://www.escholarship.org/uc/item/0f86g1pf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Armijo KM. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects. [Thesis]. University of California – Berkeley; 2011. Available from: http://www.escholarship.org/uc/item/0f86g1pf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rochester Institute of Technology

18. Mehta, Jeet. Enhanced pool boiling of water with open microchannels over cylindrical tubes.

Degree: MS, Mechanical Engineering, 2013, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/6956

► Pool boiling is a stable and efficient method for transferring large quantities of heat. It is employed in a wide range of applications, including… (more)

▼ Pool boiling is a stable and efficient method for transferring large quantities of heat. It is employed in a wide range of applications, including steam generation in boilers, petrochemical, pharmaceutical, cryogenic and many other industrial processes. The objective of this work was to investigate the augmentation in the boiling heat transfer rates with an array of open microchannels over a cylindrical tube. In order to develop high performance surfaces, rectangular and V-groove cross-sectional geometry microchannels were fabricated and tested over tubular test sections. These microchannels were manufactured in two configurations: circumferentially around the test section and axially along the length. The effects of the microchannel geometric parameters on pool boiling performance were studied under horizontal and vertical orientations. Twenty uniquely modified microchannel surfaces were designed, fabricated and tested. The best performance was obtained with a circumferential rectangular microchannel test section in the horizontal orientation. A maximum heat transfer coefficient of 129 kW/m2*K was achieved at a heat flux of 1095 kW/m2, while maintaining a wall superheat of 8.5 K. The overall enhancement factors obtained at the maximum heat flux condition, ranged between 1.9 and 3.4 in the horizontal orientation, and 2.1 and 3.1 in the vertical orientation. The critical heat flux for almost all the designed test surfaces was increased by a factor of at least 1.6 over a plain tube. Area normalized results indicated that factors other than area enhancement are responsible for augmenting the heat transfer performance. High-speed videography of bubbles nucleating, growing and departing from the heated surface was performed. The bubble behavior over these open microchannels was analyzed to understand the fundamental mechanism during pool boiling. The bubble interactions in and over the open microchannels, and the liquid rewetting phenomenon greatly influence the heat transfer performance for these surface. Advisors/Committee Members: Kandlikar, Satish.

Subjects/Keywords: Bubble dynamics; Critical heat flux; Heat transfer enhancement; Open microchannels; Pool boiling; Tube orientation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mehta, J. (2013). Enhanced pool boiling of water with open microchannels over cylindrical tubes. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/6956

Chicago Manual of Style (16^th Edition):

Mehta, Jeet. “Enhanced pool boiling of water with open microchannels over cylindrical tubes.” 2013. Masters Thesis, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/6956.

MLA Handbook (7^th Edition):

Mehta, Jeet. “Enhanced pool boiling of water with open microchannels over cylindrical tubes.” 2013. Web. 24 Jan 2021.

Vancouver:

Mehta J. Enhanced pool boiling of water with open microchannels over cylindrical tubes. [Internet] [Masters thesis]. Rochester Institute of Technology; 2013. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/6956.

Council of Science Editors:

Mehta J. Enhanced pool boiling of water with open microchannels over cylindrical tubes. [Masters Thesis]. Rochester Institute of Technology; 2013. Available from: https://scholarworks.rit.edu/theses/6956

Rochester Institute of Technology

19. Negi, Akshat. Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux.

Degree: MS, Mechanical Engineering, 2019, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/10285

► In industry, boiling heat transfer is extensively used to efficiently dissipate high heat fluxes from heated substrates. Such industrial applications of boiling include cooling… (more)

▼ In industry, boiling heat transfer is extensively used to efficiently dissipate high heat fluxes from heated substrates. Such industrial applications of boiling include cooling of reactor cores in nuclear power plants, steam generation in industrial boilers, and cooling of high heat flux generating electronic equipment. The maximum heat flux dissipated during boiling is limited by critical heat flux (CHF). At CHF, due to very high bubble generation and coalescence rates, a stable insulating vapor film is formed on the heated surface that leads to very high surface temperatures in a short time. The sudden temperature overshoot causes thermal breakdown, and therefore CHF is disastrous in all industrial applications. Owing to limited visualization of the boiling surfaces and dependence on temperature monitoring only, boiling systems are run at relatively low heat fluxes, ~50% of CHF limit due to safety considerations. The study presented here is focused on developing a method for identifying and analyzing acoustic signatures in the nucleate boiling regimes and using acoustic mapping as a monitoring tool to detect impending CHF. Initially, the sound waves generated through bubble coalescence and bubble collapse during boiling are captured for the plain copper chip. It is observed that the boiling sound is dominant in the frequency range of 400-500 Hz, while additional amplitude peaks in the frequency range of 100-200 Hz are also observed at higher heat fluxes (>100 W/cm²). Further, it is observed that just before CHF, there is a sudden drop in amplitude in the frequency range of 400-500 Hz. A similar study was performed on two additional microporous surfaces and similar acoustic trends as that of the plain copper chip was observed for both the chips. Coupling these observations with high speed visualization, the study indicates that a continuous acoustic mapping during boiling can be used as a tool to predict the impending CHF in boiling systems. Advisors/Committee Members: Satish G. Kandlikar.

Subjects/Keywords: Acoustics; Boiling heat transfer; Boiling sound; Bubble oscillation; Coalescence; Critical heat flux

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APA (6^th Edition):

Negi, A. (2019). Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/10285

Chicago Manual of Style (16^th Edition):

Negi, Akshat. “Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux.” 2019. Masters Thesis, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/10285.

MLA Handbook (7^th Edition):

Negi, Akshat. “Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux.” 2019. Web. 24 Jan 2021.

Vancouver:

Negi A. Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux. [Internet] [Masters thesis]. Rochester Institute of Technology; 2019. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/10285.

Council of Science Editors:

Negi A. Characterization of Boiling Sound at Conditions Approaching Critical Heat Flux. [Masters Thesis]. Rochester Institute of Technology; 2019. Available from: https://scholarworks.rit.edu/theses/10285

Rochester Institute of Technology

20. Liu, Felix. A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement.

Degree: MS, Mechanical Engineering, 2016, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/9321

► Miniaturization in microelectronics demands effective thermal management from high energy density devices. While current cooling solutions employ single-phase heat transfer, they are often limited… (more)

▼ Miniaturization in microelectronics demands effective thermal management from high energy density devices. While current cooling solutions employ single-phase heat transfer, they are often limited by high fluid temperature differences and pressure drops. Alternatively, two-phase cooling schemes offers attractive solutions to dissipate high heat fluxes at small temperature differences. Specifically, pool boiling has the potential to dissipate high heat fluxes without using pumps and other complex header configurations. Two performance criterion that govern the heat transfer in pool boiling systems are the (i) Critical Heat Flux (CHF), and the (ii) Heat Transfer Coefficient. The CHF is the upper limit in nucleate boiling, while the Heat Transfer Coefficient dictates the efficiency of the process. The current thesis work relates to increasing the aforementioned parameters through copper porous coatings. In this work, copper substrates were coated with 3M copper powders using a drop coating and screen printing technique. Substrate bonding was achieved by sintering at elevated temperatures. The coated substrates were characterized using Scanning Electron Microscopy and Laser Confocal Microscopy which revealed the different geometrical parameters (pore sizes and coating thickness etc.) associated with the coatings. Pool boiling tests were conducted with distilled and degassed water at atmospheric pressure. A highest Critical Heat Flux (CHF) of 303 W/cm2 was obtained on a test sample corresponding to a coating thickness of 447 µm. This translated to a CHF enhancement of ~135 % when compared to a plain copper surface. The effect of coating thickness on pool boiling performance was studied. High speed visualization was conducted on the test samples to identify underlying boiling mechanisms. The effect of additional nucleation sites, and wickability were evaluated in this study. The experimental observations were supplemented with analytical equations available in literature to identify driving mechanisms with the thin and thick porous coatings. Advisors/Committee Members: Satish Kandlikar.

Subjects/Keywords: Critical heat flux; Heat transfer performance; Pool boiling; Sintered porous surface; Wickability; Wicking rate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, F. (2016). A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/9321

Chicago Manual of Style (16^th Edition):

Liu, Felix. “A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement.” 2016. Masters Thesis, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/9321.

MLA Handbook (7^th Edition):

Liu, Felix. “A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement.” 2016. Web. 24 Jan 2021.

Vancouver:

Liu F. A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement. [Internet] [Masters thesis]. Rochester Institute of Technology; 2016. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/9321.

Council of Science Editors:

Liu F. A Study of Sintered Copper Porous Surfaces for Pool Boiling Enhancement. [Masters Thesis]. Rochester Institute of Technology; 2016. Available from: https://scholarworks.rit.edu/theses/9321

Texas A&M University

21. Roy, Ronita. Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces.

Degree: MS, Mechanical Engineering, 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/173269

► Pool boiling phenomena on different types of heater configurations have been explored in the heat transfer literature. Pool boiling experiments on heaters with nanostructured surfaces… (more)

▼ Pool boiling phenomena on different types of heater configurations have been explored in the heat transfer literature. Pool boiling experiments on heaters with nanostructured surfaces have gained popularity in contemporary literature for microchip cooling application. The thermal management challenges for cooling of electronic chips have become more acute with decrease in the size for these microchips with concomitant increase in device density and heat flux. Pool boiling is expected to provide appropriate technology solutions to meet these challenges for high heat flux cooling at low temperature differentials. In this study, results obtained from pool boiling experiments were analyzed. The experiments were performed using heaters with plain surfaces (copper and silicon) and nanostructured surfaces (Anodic Aluminum Oxide/AAO). In these experiments, high speed digital image acquisition apparatus was used to record bubble dynamics (nucleation, growth and departure) for both nucleate and film boiling regimes. The videos were used to obtain the bubble diameter at departure, bubble growth rates (bubble height as a function of time) and bubble departure frequency. The objective of these experiments was to explore the change in bubble dynamics for different heater configurations in order to ascertain their role in the observed changes in the values of pool boiling heat flux as a function of wall superheat (i.e., from the boiling curves obtained in these experiments). These experiments were performed for saturated boiling conditions as well as for liquid subcooling of 5 °C and 10 °C. The test fluid was PF-5060 (Manufacturer: 3M Corp.). The experimental apparatus utilized in this study consisted of a visualization chamber, cartridge heaters, power supply, high speed digital data acquisition system and chiller unit. Temperature nanosensors (Thin Film Thermocouples/ TFT) as well as wire bead thermocouples were used for measurement of wall superheat. Micro/ nano-fabrication techniques were utilized in this study for realizing the test surfaces integrated with temperature nanosensors. The data gleaned from these experiments were compiled to obtain a correlation for the optimal heat transfer for different heater surface configurations. Literature review was also performed in this study to compare the experimental results with correlations for bubble dynamics available in the literature. The experimental results for bubble dynamics show that while silicon and copper surfaces have similar values for bubble departure diameter, the variability in the bubble departure frequency values for copper heater experiments were larger than that of silicon heaters. This trend is potentially due to large variation in surface roughness on copper heaters compared to that of silicon wafers (which are single crystal silicon substrates and therefore are atomically smooth at the commencement of the experiments). Heaters with nanostructured surfaces (e.g., for AAO heaters) were observed to yield smaller bubble departure diameters and higher bubble… Advisors/Committee Members: Banerjee, Debjyoti (advisor), Kirkland, Karen (committee member), Felts, Jonathan (committee member).

Subjects/Keywords: Pool boiling; Nanostructures; Critical Heat Flux; Heat Transfer; Boiling Curve; Departure diameter; Departure frequency

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APA (6^th Edition):

Roy, R. (2017). Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173269

Chicago Manual of Style (16^th Edition):

Roy, Ronita. “Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces.” 2017. Masters Thesis, Texas A&M University. Accessed January 24, 2021. http://hdl.handle.net/1969.1/173269.

MLA Handbook (7^th Edition):

Roy, Ronita. “Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces.” 2017. Web. 24 Jan 2021.

Vancouver:

Roy R. Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1969.1/173269.

Council of Science Editors:

Roy R. Hydrodynamic and Thermal Analyses of Pool Boiling Data Obtained from Experiments Performed on Flat Horizontal Heaters with Conventional and Nano-Structured Surfaces. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/173269

University of Toronto

22. Nejad, Saman Shaban. Bubble Formation in a Horizontal Channel at Subcooled Flow Condition.

Degree: 2013, University of Toronto

URL: http://hdl.handle.net/1807/42917

►

Bubble nucleation at subcooled flow boiling condition in a horizontal annular channel with a square cross section by the use of high-speed camera is investigated.… (more)

Subjects/Keywords: Subcooled two phase flow; Bubble nucleation; Critical Heat Flux; Heat transfer; 0548

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APA (6^th Edition):

Nejad, S. S. (2013). Bubble Formation in a Horizontal Channel at Subcooled Flow Condition. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/42917

Chicago Manual of Style (16^th Edition):

Nejad, Saman Shaban. “Bubble Formation in a Horizontal Channel at Subcooled Flow Condition.” 2013. Masters Thesis, University of Toronto. Accessed January 24, 2021. http://hdl.handle.net/1807/42917.

MLA Handbook (7^th Edition):

Nejad, Saman Shaban. “Bubble Formation in a Horizontal Channel at Subcooled Flow Condition.” 2013. Web. 24 Jan 2021.

Vancouver:

Nejad SS. Bubble Formation in a Horizontal Channel at Subcooled Flow Condition. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1807/42917.

Council of Science Editors:

Nejad SS. Bubble Formation in a Horizontal Channel at Subcooled Flow Condition. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/42917

McMaster University

23. Statham, Bradley A. Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow.

Degree: PhD, 2014, McMaster University

URL: http://hdl.handle.net/11375/14242

►

The effect of pressure transients on the onset of intermittent dryout in upward annular flow was experimentally investigated in order to resolve the conflict… (more)

▼

The effect of pressure transients on the onset of intermittent dryout in upward annular flow was experimentally investigated in order to resolve the conflict between the observations drawn from two major data sets in the literature. A delay in time to the onset of dryout at the test section exit relative to the time predicted based on steady-state data was observed in the R-12 experiments of Celata et al (1988; 1991). Steady-state prediction methods were sufficient to predict the upstream progression of a pre-existing dryout front in the water experiments of Lyons and Swinnerton (1983). Steady state and pressure transient dryout experiments were performed using water with outlet pressures of 2 to 6 MPa and mass fluxes of 1000 to 2500 kg/m2/s in an electrically heated 1.32 m long 4.6 mm ID vertical Inconel 600 tube with depressurisation rates of up to 1.0 MPa/s. Transient experiments were performed with a small margin to dryout and with post-dryout initial conditions in order to test the hypothesis that these initial conditions influenced the onset of dryout during transients. The results of a comparison between the steady dryout data and two dryout prediction methods – the Biasi et al (1967) correlation and the 2006 CHF look-up table (Groeneveld et al, 2007) – were used to develop correction factor correlations to reduce systematic error when these methods were used to predict the transient time to dryout. These modified methods yielded mean predicted dryout delays of -0.1 and 1.5 s respectively with standard deviations of approximately 3 s. There was no statistically significant variation between the pre- and post-dryout initial conditions. Based on this result it was concluded that the initial conditions did not affect the observed time to dryout. The mean wall temperature exhibited a discontinuous decrease as the heat flux approached 92 to 95% of the dryout value. It was postulated that this was caused by a heat transfer regime change from liquid film evaporation to droplet evaporation based on the observations of Hewitt (1970), Doroschuk et al (1970) and Groeneveld (2011). For the range of conditions of the present work the onset of intermittent dryout (Groeneveld, 1986) was caused by deterioration of droplet evaporation heat transfer. Celata et al (1988) noted that in their pressure transient experiments the decrease in saturation temperature drove a rapid increase in the heat flux to the fluid. This was caused by the release of stored thermal energy as the test section wall cooled. Celata et al (1991) stated that the systematic dryout delay was observed for depressurisation rates greater than 0.2 MPa/s. Using Celata et al's (1988) pressure transient data it was concluded that the stored thermal energy transient did not influence the onset of intermittent dryout when rho_w c_pw L_w *(dT_sat/dt)<0.3*q''_a.

Doctor of Philosophy (PhD)

Advisors/Committee Members: Novog, D. R., Engineering Physics.

Subjects/Keywords: Two-Phase Flow; Critical Heat Flux; Nuclear Safety; Transient; Dryout; Heat Transfer, Combustion; Nuclear Engineering; Heat Transfer, Combustion

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APA (6^th Edition):

Statham, B. A. (2014). Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/14242

Chicago Manual of Style (16^th Edition):

Statham, Bradley A. “Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow.” 2014. Doctoral Dissertation, McMaster University. Accessed January 24, 2021. http://hdl.handle.net/11375/14242.

MLA Handbook (7^th Edition):

Statham, Bradley A. “Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow.” 2014. Web. 24 Jan 2021.

Vancouver:

Statham BA. Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow. [Internet] [Doctoral dissertation]. McMaster University; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11375/14242.

Council of Science Editors:

Statham BA. Measurement and Prediction of the Onset of Intermittent Dryout During Blowdown Transients for Upward Annular Flow. [Doctoral Dissertation]. McMaster University; 2014. Available from: http://hdl.handle.net/11375/14242

Penn State University

24. Riley, Michael Patrick. Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14213

► A new physics-based heat transfer correlation has been developed that can be used to predict the local variation of the nucleate boiling heat flux on… (more)

Subjects/Keywords: Nucleate Boiling; Critical Heat Flux; Pool Boiling; Heat Transfer; Buoyancy Driven Flow; Buoyancy Driven Heat Transfer

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APA (6^th Edition):

Riley, M. P. (2012). Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Riley, Michael Patrick. “Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface.” 2012. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/14213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Riley, Michael Patrick. “Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface.” 2012. Web. 24 Jan 2021.

Vancouver:

Riley MP. Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/14213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Riley MP. Development of a Correlation for Nucleate Boiling Heat Flux on a Hemispherical Downward Facing Surface. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/14213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

25. Lu, Chin-Yuan. Design and Performance Analysis of a Miniature Spray Cooling System.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2012, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757

► The aim of this study is to design and build a miniature spray cooling system, in which the manufactured and adopted chamber, pump and heat… (more)

Subjects/Keywords: Miniature spray cooling system; Nanofludics; Boiling curve; Cooling curve; Critical heat flux

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APA (6^th Edition):

Lu, C. (2012). Design and Performance Analysis of a Miniature Spray Cooling System. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lu, Chin-Yuan. “Design and Performance Analysis of a Miniature Spray Cooling System.” 2012. Thesis, NSYSU. Accessed January 24, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lu, Chin-Yuan. “Design and Performance Analysis of a Miniature Spray Cooling System.” 2012. Web. 24 Jan 2021.

Vancouver:

Lu C. Design and Performance Analysis of a Miniature Spray Cooling System. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Jan 24]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lu C. Design and Performance Analysis of a Miniature Spray Cooling System. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

26. Gorton, Jacob Preston. Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs.

Degree: 2018, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/15837jpg5323

► Since the 2011 accident at the Daiichi nuclear power plant in Fukushima, Japan, there has been a worldwide effort to develop so-called accident tolerant fuel… (more)

▼ Since the 2011 accident at the Daiichi nuclear power plant in Fukushima, Japan, there has been a worldwide effort to develop so-called accident tolerant fuel (ATF) technologies to enhance safety during design basis and beyond design basis accidents. Part of the ATF development effort involves replacing much of the zirconium-based materials in light water reactors (LWRs). This is due to the accelerated oxidation rate of zirconium at high temperatures potentially experienced during severe accidents, which led to the build-up of hydrogen gas and eventual explosions that occurred at the Daiichi nuclear power plant. To be considered as a possible alternative to zirconium, an ATF candidate material must not only have greater oxidation resistance but must also have equal or better performance than zirconium in reactor operations and safety. Two candidate materials that may meet these requirements are iron-chromium-aluminum (FeCrAl) alloys and silicon carbide fiber-reinforced, silicon carbide matrix composites (SiC/SiC). Two studies on ATF concepts are presented in this thesis, which focus on using computer simulations to evaluate the use of FeCrAl as the fuel rod cladding material in a pressurized water reactor (PWR) and the use of SiC/SiC as the fuel assembly channel box material in a boiling water reactor (BWR). Both of these studies are performed using computer modeling, which is one of the first steps for evaluating new design concepts and eventually integrating them into existing reactors. Developing tools that can accurately predict the performance of nuclear reactors with high fidelity is the goal of the Consortium for Advanced Simulation of Light Water Reactors (CASL). Also included in this thesis is a preliminary demonstration of neutronic-to-thermal-hydraulic coupled BWR simulations performed using the CASL tools MPACT and CTF. In the first study, a model of a PWR fuel assembly was created to predict the critical heat flux (CHF) of FeCrAl fuel rod cladding during an imposed 50% overpower condition, which may be representative of an accident condition. CHF is a critical parameter to evaluate for ATF candidate materials because reaching CHF in a fuel rod can cause a rapid increase in temperature in the reactor that may lead to bursting of the cladding and a loss of ability to cool the core. Current correlations used for predicting flow boiling CHF in reactors are not dependent on material or surface characteristics, but this study showed that preliminary pool boiling results could be used to modify existing CHF correlations to make them more applicable to a given material, such as FeCrAl. Preliminary transient flow boiling experiments are also analyzed in this thesis for Inconel 600 and Stainless Steel 316, which pave the way for future flow boiling experiments using FeCrAl. In the second study, BWR fuel assembly models were created with a SiC/SiC channel box to predict a spatial temperature and fast neutron flux distribution in the channel box. The temperature and fast flux distributions were then used as… Advisors/Committee Members: Nicholas Brown, Thesis Advisor/Co-Advisor, Benjamin Collins, Committee Member, Arthur Motta, Committee Member.

Subjects/Keywords: Accident Tolerant Fuel; Critical Heat Flux; Channel Box; Silicon Carbide; FeCrAl; CTF; MPACT/CTF

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APA (6^th Edition):

Gorton, J. P. (2018). Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15837jpg5323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gorton, Jacob Preston. “Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs.” 2018. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/15837jpg5323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gorton, Jacob Preston. “Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs.” 2018. Web. 24 Jan 2021.

Vancouver:

Gorton JP. Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/15837jpg5323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gorton JP. Thermal Hydraulics of Accident Tolerant Fuel Concepts and a Preliminary Demonstration of CASL’s Coupled Tools for BWRs. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15837jpg5323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

27. Ellis, Christopher P. Assessment of level swell measurements in the OSU APEX Test Facility.

Degree: MS, Nuclear Engineering, 2000, Oregon State University

URL: http://hdl.handle.net/1957/32980

► The purposes of this paper are to present the results of an experimental effort to measure the level swell in an air/water system and to… (more)

Subjects/Keywords: Pressurized water reactors – Critical heat flux

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APA (6^th Edition):

Ellis, C. P. (2000). Assessment of level swell measurements in the OSU APEX Test Facility. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/32980

Chicago Manual of Style (16^th Edition):

Ellis, Christopher P. “Assessment of level swell measurements in the OSU APEX Test Facility.” 2000. Masters Thesis, Oregon State University. Accessed January 24, 2021. http://hdl.handle.net/1957/32980.

MLA Handbook (7^th Edition):

Ellis, Christopher P. “Assessment of level swell measurements in the OSU APEX Test Facility.” 2000. Web. 24 Jan 2021.

Vancouver:

Ellis CP. Assessment of level swell measurements in the OSU APEX Test Facility. [Internet] [Masters thesis]. Oregon State University; 2000. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1957/32980.

Council of Science Editors:

Ellis CP. Assessment of level swell measurements in the OSU APEX Test Facility. [Masters Thesis]. Oregon State University; 2000. Available from: http://hdl.handle.net/1957/32980

Virginia Tech

28. Sayee Mohan, Kaushik. Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms.

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/71873

► This thesis investigates pool boiling heat transfer from bare and graphene-coated NiCr wires in a saturated liquid of FC 770, a fluorocarbon fluid. Of particular… (more)

Subjects/Keywords: Pool boiling; critical heat flux; graphene oxide; reduced graphene oxide; Fluorinert FC 770; Hummer's method

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APA (6^th Edition):

Sayee Mohan, K. (2016). Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71873

Chicago Manual of Style (16^th Edition):

Sayee Mohan, Kaushik. “Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms.” 2016. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/71873.

MLA Handbook (7^th Edition):

Sayee Mohan, Kaushik. “Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms.” 2016. Web. 24 Jan 2021.

Vancouver:

Sayee Mohan K. Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/71873.

Council of Science Editors:

Sayee Mohan K. Pool Boiling of FC 770 on Graphene Oxide Coatings: A Study of Critical Heat Flux and Boiling Heat Transfer Enhancement Mechanisms. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/71873

University of Lund

29. Vermina Plathner, Frida. Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory.

Degree: 2020, University of Lund

URL: https://lup.lub.lu.se/record/4fabe26a-aaeb-4bc3-b738-4dda94184692 ; https://portal.research.lu.se/ws/files/75716100/SPIKFIL_FRIDA.pdf

► Ignition and extinction characteristics of a material determine whether a fire will be initiated and grow. In fire safety engineering, where modellers deal with a… (more)

▼ Ignition and extinction characteristics of a material determine whether a fire will be initiated and grow. In fire safety engineering, where modellers deal with a multitude of materials, simplified thresholds are commonly used to determine when ignition and extinction occur.Such a threshold is the critical mass flux, which describes when sufficient fuel vapour is produced to support sustained flaming.A related criterion is the critical heat release rate.This thesis is an investigation of how these two thresholds are correlated to environmental and fuel specific properties. This assessment is accomplished with small-scale experiments and stagnant layer theory. Experimental equipment were fine tuned to enable quantification of each investigated influence on the threshold criteria. A cone calorimeter sample set-up was modified so that the sample material could be exposed to a more uniform heat flux and the influence of external heating on the critical mass flux could be better quantified. Porous gas burners have been used previously to emulate burning of condensed fuels. In this thesis, such burners were used so that mass transport at the limiting points could be held at a constant rate. A set of burners with different diameters were used to provide insight on the influence of the convective heat transfer coefficient on the critical mass flux. Both the cone calorimeter test results and the gas burner results yielded information about the chemical heat of combustion of the fuels. It is shown that the critical mass flux, but not the critical heat release rate, is a function of the chemical heat of combustion. The thresholds are also dependent on the sample size, which is seen in the correlation for the convective heat transfer coefficient. Although the external heat flux influences the mass loss rate history it does not significantly change the amount of pyrolysates needed for sustained flaming. The findings are summarized in an engineering correlation that can be used to find approximate values for fire modelling.

Subjects/Keywords: Other Civil Engineering; Critical mass flux; diffusion flame; extinction; sustained ignition; chemical heat of combustion; Convective heat transfer coefficient; external heat flux

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vermina Plathner, F. (2020). Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/4fabe26a-aaeb-4bc3-b738-4dda94184692 ; https://portal.research.lu.se/ws/files/75716100/SPIKFIL_FRIDA.pdf

Chicago Manual of Style (16^th Edition):

Vermina Plathner, Frida. “Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory.” 2020. Doctoral Dissertation, University of Lund. Accessed January 24, 2021. https://lup.lub.lu.se/record/4fabe26a-aaeb-4bc3-b738-4dda94184692 ; https://portal.research.lu.se/ws/files/75716100/SPIKFIL_FRIDA.pdf.

MLA Handbook (7^th Edition):

Vermina Plathner, Frida. “Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory.” 2020. Web. 24 Jan 2021.

Vancouver:

Vermina Plathner F. Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory. [Internet] [Doctoral dissertation]. University of Lund; 2020. [cited 2021 Jan 24]. Available from: https://lup.lub.lu.se/record/4fabe26a-aaeb-4bc3-b738-4dda94184692 ; https://portal.research.lu.se/ws/files/75716100/SPIKFIL_FRIDA.pdf.

Council of Science Editors:

Vermina Plathner F. Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory. [Doctoral Dissertation]. University of Lund; 2020. Available from: https://lup.lub.lu.se/record/4fabe26a-aaeb-4bc3-b738-4dda94184692 ; https://portal.research.lu.se/ws/files/75716100/SPIKFIL_FRIDA.pdf

University of Missouri – Columbia

30. Feng, Xin, 1978-. Experimental and analytical study on two-phase impingement cooling with and without electric field.

Degree: PhD, 2007, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/4853

► Among the thermal management solutions for power electronics, two-phase jet or spray impingement cooling are two promising candidates. In this study, electrohydrodynamic atomization (EHDA) method… (more)

Subjects/Keywords: electrohydrodynamic atomization (EHDA); critical heat flux (CHF); electrohydrodynamic atomization (EHDA); critical heat flux (CHF); Power electronics; Heat flux; Heat – Transmission

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Feng, Xin, 1. (2007). Experimental and analytical study on two-phase impingement cooling with and without electric field. (Doctoral Dissertation). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/4853

Chicago Manual of Style (16^th Edition):

Feng, Xin, 1978-. “Experimental and analytical study on two-phase impingement cooling with and without electric field.” 2007. Doctoral Dissertation, University of Missouri – Columbia. Accessed January 24, 2021. http://hdl.handle.net/10355/4853.

MLA Handbook (7^th Edition):

Feng, Xin, 1978-. “Experimental and analytical study on two-phase impingement cooling with and without electric field.” 2007. Web. 24 Jan 2021.

Vancouver:

Feng, Xin 1. Experimental and analytical study on two-phase impingement cooling with and without electric field. [Internet] [Doctoral dissertation]. University of Missouri – Columbia; 2007. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10355/4853.

Council of Science Editors:

Feng, Xin 1. Experimental and analytical study on two-phase impingement cooling with and without electric field. [Doctoral Dissertation]. University of Missouri – Columbia; 2007. Available from: http://hdl.handle.net/10355/4853

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