subject:(TWo phase flow)

Oregon State University

1. Truszkowska, Agnieszka. Multiscale modeling of two-phase flows in microarchitectures with microfeatures.

Degree: PhD, Chemical Engineering, 2014, Oregon State University

URL: http://hdl.handle.net/1957/54887

► Two-phase flows in microtechnology based devices are purposefully present in multiphase reactors, phase separators, analytical devices and others. Two-phase flows can also be an undesirable… (more)

▼ Two-phase flows in microtechnology based devices are purposefully present in multiphase reactors, phase separators, analytical devices and others. Two-phase flows can also be an undesirable side effect occurring during operation due to phase transitions or, more commonly, introduction of surrounding air through equipment gaps and with process feed. In both cases, the two phases require control to achieve desired system performance. Devices with microfeatures such as posts and pillars represent relatively unexplored design direction with the potential for successful fulfillment of various multi-phase flows objectives. Efficient design of microfeatured devices requires computational tools. However, the importance of two-phase interface physics imposes high resolution computing, which when combined with usual microtechnology high-aspect ratios results in large computational efforts. Multiscale modeling provides a means for preserving accuracy while lowering computational costs. This thesis proposes a novel multiscale modeling approach for modeling microarchitectures with microfeatures. The main idea of the approach is to enable numerical simulations of two-phase flows in microfeatured architectures without resolving the actual microfeatures. Effect of microfeatures presence is incorporated through a coupling operator, vector, or scalar field. Removal of microfeatures allows for modeling with significantly coarser computational grids with grid size being limited by the smallest droplet sizes. Multiscale modeling approach is accompanied by a piecewise modeling concept in which characterization of the entire microarchitecture is performed with smaller, and hence computationally less intensive, representative domains. Piecewise modeling can be used as a replacement for full-size architecture simulations in multiscale modeling but can also serve as an independent modeling tool. The basic framework of the proposed approach is developed based on the example of droplet retention times in microfeatured architectures. This approach is successfully incorporated into Shan and Chen Lattice Boltzmann method, validated and applied to three different architectures. Demonstrated are the capabilities and challenges of the proposed multiscale modeling approach. Viability and potential improvements of piecewise modeling are also confirmed. Advisors/Committee Members: Jovanovic, Goran N. (advisor), Apte, Sourabh (committee member).

Subjects/Keywords: multiscale modeling; Two-phase flow

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APA (6^th Edition):

Truszkowska, A. (2014). Multiscale modeling of two-phase flows in microarchitectures with microfeatures. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/54887

Chicago Manual of Style (16^th Edition):

Truszkowska, Agnieszka. “Multiscale modeling of two-phase flows in microarchitectures with microfeatures.” 2014. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/54887.

MLA Handbook (7^th Edition):

Truszkowska, Agnieszka. “Multiscale modeling of two-phase flows in microarchitectures with microfeatures.” 2014. Web. 14 Apr 2021.

Vancouver:

Truszkowska A. Multiscale modeling of two-phase flows in microarchitectures with microfeatures. [Internet] [Doctoral dissertation]. Oregon State University; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/54887.

Council of Science Editors:

Truszkowska A. Multiscale modeling of two-phase flows in microarchitectures with microfeatures. [Doctoral Dissertation]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/54887

Oregon State University

2. Skinner, Jesse B. Phase distribution parameter determination by neutron radiography.

Degree: MS, Nuclear Engineering, 2008, Oregon State University

URL: http://hdl.handle.net/1957/7612

► A phase distribution parameter has been added to the one-dimensional two-phase horizontal flow conservation equations. The phase distribution parameter was incorporated into the conservation equations… (more)

Subjects/Keywords: Neutron; Two-phase flow

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APA (6^th Edition):

Skinner, J. B. (2008). Phase distribution parameter determination by neutron radiography. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/7612

Chicago Manual of Style (16^th Edition):

Skinner, Jesse B. “Phase distribution parameter determination by neutron radiography.” 2008. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/7612.

MLA Handbook (7^th Edition):

Skinner, Jesse B. “Phase distribution parameter determination by neutron radiography.” 2008. Web. 14 Apr 2021.

Vancouver:

Skinner JB. Phase distribution parameter determination by neutron radiography. [Internet] [Masters thesis]. Oregon State University; 2008. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/7612.

Council of Science Editors:

Skinner JB. Phase distribution parameter determination by neutron radiography. [Masters Thesis]. Oregon State University; 2008. Available from: http://hdl.handle.net/1957/7612

Oregon State University

3. Kwak, Younghoon. Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network.

Degree: PhD, Mechanical Engineering, 2008, Oregon State University

URL: http://hdl.handle.net/1957/9049

► Two-phase gas-liquid flows in microscale fractal-like branching channel flow networks were experimentally studied to assess the validity of existing void fraction correlations and flow regimes… (more)

▼ Two-phase gas-liquid flows in microscale fractal-like branching channel flow networks were experimentally studied to assess the validity of existing void fraction correlations and flow regimes based on superficial gas and liquid velocities. Void fractions were assessed using two different methods. First, void fraction data were acquired using a High-Speed-High-Resolution (HSHR) camera and computed by area-based two-dimensional image analysis. Void fraction data were also computed using a slip ratio, defined as gas velocity over liquid velocity. Liquid velocity represents the bulk-averaged liquid velocity as determined by microscale particle image velocimetry (micro-PIV). Gas velocity was determined by averaging gas-liquid interface velocities made at the channel centerline. The fractal-like branching channel flow network has five bifurcation levels of different channel widths varying from 400 µm to 100 µm with a fixed channel depth of 250 µm. Each downstream width decreases by 30% whereas the downstream lengths increase by 40%. The total flow length through a single path is approximately 18 mm. Filtered air and deionized water were used as the gas and liquid working fluids, respectively. Mass flow rates of air and water into each k=0 branch were varied from 0.3 g/min to 2.5 g/min and from 5.2x10⁻⁵ g/min to 1.3x10⁻² g/min, respectively. These flow rates yielded superficial air and water velocities through the same branch level between 0.007 m/s and 1.8 m/s and between 0.05 m/s and 0.42 m/s, respectively. For each branching level, due to an increase in flow area, the superficial liquid and gas flow rates change. A two-phase flow regime map was generated for each level of the fractal-like branching flow network and compared to maps developed using the Taitel and Dukler (1976) model and to maps presented in Chung and Kawaji (2004). Flow regime transitions are well predicted with the Taitel and Dukler (1976) model for each branching level. Void fraction assessed using the slip ratio shows very good agreement with the homogeneous void fraction model for all branching levels. On the other hand, void fraction determined by area-based two-dimensional image analysis shows better agreement with the void fraction correlation of Zivi (1964). Advisors/Committee Members: Pence, Deborah V. (advisor), Narayanan, Vinod (committee member).

Subjects/Keywords: microchannel; Two-phase flow

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APA (6^th Edition):

Kwak, Y. (2008). Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/9049

Chicago Manual of Style (16^th Edition):

Kwak, Younghoon. “Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network.” 2008. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/9049.

MLA Handbook (7^th Edition):

Kwak, Younghoon. “Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network.” 2008. Web. 14 Apr 2021.

Vancouver:

Kwak Y. Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network. [Internet] [Doctoral dissertation]. Oregon State University; 2008. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/9049.

Council of Science Editors:

Kwak Y. Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network. [Doctoral Dissertation]. Oregon State University; 2008. Available from: http://hdl.handle.net/1957/9049

University of Waterloo

4. Guo, Huiquan. Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site.

Degree: 2011, University of Waterloo

URL: http://hdl.handle.net/10012/5871

► Abnormal pressures have been measured in the deep boreholes at the Bruce site, southern Ontario, where a deep geologic repository for low and intermediate level… (more)

▼ Abnormal pressures have been measured in the deep boreholes at the Bruce site, southern Ontario, where a deep geologic repository for low and intermediate level radioactive waste disposal has been proposed. The pressure regime in the stratigraphic units exhibits either higher than hydrostatic pressure (over-pressured) or lower than hydrostatic pressure (under-pressured) are considered to be abnormal. At the Bruce site, the Ordovician sediments are under-pressured while the underlying Cambrian sandstone and the overlying Guelph carbonate are over-pressured. Hypotheses have been documented in literature to explain the phenomenon of abnormal pressures. These hypotheses include osmosis, glacial loading and deglaciation unloading, exhumation of overlying sediments, crustal flexure and the presence of an immiscible gas phase. Previous work on the Bruce site has shown that the under-pressures in the Ordovician limestone and shales could not be explained by glaciation and deglaciation or by saturated analyses. The presence of a gas phase in the Ordovician formations has been determined to be a reasonable cause of the under-pressure developed in the Ordovician shales and limestones at the Bruce site. Support for the presence of a gas phase includes solution concentrations of methane, concentrations of environmental isotopes related to methane and estimates of water and gas saturations from laboratory core analyses. The primary contribution of this thesis is the sensitivity analyses performed on the hydrogeologic parameters with respect to a one dimensional two-phase flow model. First, a one dimensional two-phase air and water flow model was adopted and reconstructed to simulate the long-term evolution of the groundwater regimes at the DGR site. Then the hydrogeologic parameters which impact the presence of under-pressure in the groundwater are investigated. Data required to quantify the properties of geologic media and groundwater are adopted directly from borehole testing and laboratory testing results. The permeable boundaries of the domain are assumed to be water saturated and pressure specified (using hydrostatic conditions in the Guelph Formation and hydrostatic with 120 m over-pressure condition in the Cambrian and Precambrian). Isothermal conditions were assumed, thus constant water density and viscosity values are estimated for the average total dissolved solids (TDS) concentration of the modelled stratigraphic column. A constant diffusion coefficient (a diffusivity of 0.25 × 10^-8 m²/s) of air in water is assumed with a saturation-dependent tortuosity. The air generation rate is assumed to simulate the gas phase generated in the Ordovician formations. The numerical simulation of up to 4 million years provides a means to explore the behaviour of gas phase dissipation due to partitioning into the water phase and diffusive transport in the solute phase. Results confirmed that the presence of a gas phase would result in the under-pressure in water.

Subjects/Keywords: Two-phase flow; Low permeability

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APA (6^th Edition):

Guo, H. (2011). Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5871

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):

Guo, Huiquan. “Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site.” 2011. Thesis, University of Waterloo. Accessed April 14, 2021. http://hdl.handle.net/10012/5871.

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

MLA Handbook (7^th Edition):

Guo, Huiquan. “Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site.” 2011. Web. 14 Apr 2021.

Vancouver:

Guo H. Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10012/5871.

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

Council of Science Editors:

Guo H. Long Term Two-Phase Flow Analysis of the Deep Low Permeability Rock at the Bruce DGR Site. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/5871

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

Universidade Estadual de Campinas

5. Silva, Felipe Jaloretto da, 1982-. Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água.

Degree: Faculdade de Engenharia Mecânica; Programa de Pós-Graduação em Engenharia Mecânica, 2018, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333585

►

Orientador: Marcelo Souza de Castro

Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica

Made available in DSpace on 2019-03-28T19:40:21Z (GMT). No. of… (more)

▼

Orientador: Marcelo Souza de Castro

Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica

Made available in DSpace on 2019-03-28T19:40:21Z (GMT). No. of bitstreams: 1 Silva_FelipeJalorettoDa_M.pdf: 12172960 bytes, checksum: 375e2c3214fe19405135685018bf466b (MD5) Previous issue date: 2018

Resumo: O estudo dos escoamentos multifásicos é base teórica para inúmeras aplicações. Diversos trabalhos buscaram entender o fenômeno a partir de diferentes frentes, entre eles: identificação dos padrões de escoamento formados; quantificação de frações de cada componente; quantificação das velocidades e parâmetros de escorregamento entre eles; além de estudos de perda de pressão bifásica. No presente trabalho analisou-se a influência do diâmetro da tubulação em busca de hipóteses que pudessem orientar os experimentos na horizontal utilizando água e ar. Foram montadas quatro bancadas experimentais com uma, duas, três e quatro polegadas de diâmetro nominal. Variados parâmetros foram medidos, ou calculados, como vazões e velocidades, perda de pressão e propriedades dos fluidos, além de serem estudados os padrões de escoamento formados, com identificação visual e uso de assinatura temporal de pressão diferencial. Mapas dos padrões de escoamento foram apresentados, mostrando pouca variação entre os diâmetros de uma e duas polegadas, mas com mudanças nas regiões de transição para os dois maiores diâmetros, além da identificação do padrão estratificado ondulado na região de transição para os padrões intermitentes. Além disso as variações das perdas de pressão bifásica, em função das velocidades superficiais e das frações de injeção de cada fase, mostraram crescimento com a redução do diâmetro. A perda de pressão bifásica foi comparada em até quatro diâmetros e identificou-se sua variação na forma inversamente proporcional a uma potência do diâmetro do tubo cujo valor varia entre 1,2 e 1,8, para mesmas velocidades superficiais, ou entre 2,6 e 3,22 mantendo-se constante o Reynolds de cada fase. O modelo homogêneo mostrou-se promissor para cálculo da perda de pressão bifásica em todos os diâmetros estudados

The study of multiphase flows is the theoretical basis for many applications. Several works sought to understand the phenomenon from different fronts, among them: identification of flow patterns; quantification of void fraction; quantification of velocities and slip parameters between each component; besides the studies of pressure drop. In the present work the influences of the pipe diameter were analyzed in search of hypotheses that could guide the experiments in the horizontal one using water and air. Four experimental benches were assembled with one, two, three and four inches of nominal diameter. Several parameters were measured, or calculated, such as flow rates and velocities, pressure drop and fluid properties, in addition to studying the flow patterns with visual identification and signal analysis of the differential pressure signature on time. Flow pattern maps were presented,…

Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS, Castro, Marcelo Souza de, 1986-, Biazussi, Jorge Luiz, Jabardo, Paulo José Saiz.

Subjects/Keywords: Escoamento bifásico; Two-phase flow

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

APA (6^th Edition):

Silva, Felipe Jaloretto da, 1. (2018). Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água. (Masters Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/333585

Chicago Manual of Style (16^th Edition):

Silva, Felipe Jaloretto da, 1982-. “Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água.” 2018. Masters Thesis, Universidade Estadual de Campinas. Accessed April 14, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/333585.

MLA Handbook (7^th Edition):

Silva, Felipe Jaloretto da, 1982-. “Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água.” 2018. Web. 14 Apr 2021.

Vancouver:

Silva, Felipe Jaloretto da 1. Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água. [Internet] [Masters thesis]. Universidade Estadual de Campinas; 2018. [cited 2021 Apr 14]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333585.

Council of Science Editors:

Silva, Felipe Jaloretto da 1. Estudo do efeito do diâmetro da tubulação em escoamentos bifásicos horizontais ar-água. [Masters Thesis]. Universidade Estadual de Campinas; 2018. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333585

North Carolina State University

6. Cassidy, Daniel Anthony. Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications.

Degree: PhD, Mechanical Engineering, 2009, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5199

► The present study is both a numerical and experimental investigation into the two phase flow of a microPCM fluid in a circular tube with mixed… (more)

▼ The present study is both a numerical and experimental investigation into the two phase flow of a microPCM fluid in a circular tube with mixed convection. The PCM was octacosane encapsulated by a polyethylene shell to form a spherical particle with an average diameter of 20 microns. The microPCM particles were suspended in a 50 / 50 ethylene glycol water mixture. The flow was through a 0.00775 m diameter copper tube with a length of approximately 0.75m. A constant wall heat flux was supplied by an electric resistance wire. The flow was gravity fed with a pumped circulation to maintain a constant pressure head. Experimental measurements were made of the tube outer wall at the top and bottom of the copper tube. Numerically an incompressible flow model was used with an Eulerian - Eulerian method to solve the two phase momentum and energy equations. The numerical model was verified using experimental data of single phase flow with mixed convection available in literature and was also verified by thermal results of both single phase and two phase flow from the experimental work in the current investigation. Through the numerical investigation of the experimental conditions it was found that when the slurry was not cooled to a temperature far enough below the inlet temperature a supercooling effect did not allow a full use of the latent heat available in the octacosane microPCM, only about 50% of the total latent heat was used in one case. Further numerical investigations included tube wall material in which stainless steel was compared to the copper tubing used in the experiment. The inclusion of the solid phase buoyancy term was found to affect the thermal solution. A comparison was also made of microPCM flow rates in which the Reynolds number, the mass flow rate, and the pump power were each held constant and the solutions compared. It was then recommended that a constant pump power be used as a basis for comparison. A parametric study was also completed in which the Rayleigh number and the Stefan number were both varied to find the effects on the thermal and hydrodynamic solution. Advisors/Committee Members: Dr. Richard D. Gould, Committee Chair (advisor), Dr. Kevin M. Lyons, Committee Member (advisor), Dr. Andrey V. Kuznetsov, Committee Member (advisor), Dr. James W. Leach, Committee Member (advisor).

Subjects/Keywords: phase change material; two phase flow; octacosane

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

APA (6^th Edition):

Cassidy, D. A. (2009). Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5199

Chicago Manual of Style (16^th Edition):

Cassidy, Daniel Anthony. “Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications.” 2009. Doctoral Dissertation, North Carolina State University. Accessed April 14, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5199.

MLA Handbook (7^th Edition):

Cassidy, Daniel Anthony. “Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications.” 2009. Web. 14 Apr 2021.

Vancouver:

Cassidy DA. Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Apr 14]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5199.

Council of Science Editors:

Cassidy DA. Numerical and Experimental Investigations of Mixed Convection in Solid-Liquid Flow for MicroPCM Applications. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5199

Penn State University

7. Nedwidek, Frank Maurin. Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition .

Degree: 2011, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/12327

► This study investigates the effect of the spacer grid flow restriction on flow regime transition and additional loss in pressure in an air-water spacer grid… (more)

Subjects/Keywords: flow regime; spacer grid; two-phase flow

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APA (6^th Edition):

Nedwidek, F. M. (2011). Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/12327

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):

Nedwidek, Frank Maurin. “Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition .” 2011. Thesis, Penn State University. Accessed April 14, 2021. https://submit-etda.libraries.psu.edu/catalog/12327.

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

MLA Handbook (7^th Edition):

Nedwidek, Frank Maurin. “Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition .” 2011. Web. 14 Apr 2021.

Vancouver:

Nedwidek FM. Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition . [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Apr 14]. Available from: https://submit-etda.libraries.psu.edu/catalog/12327.

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

Council of Science Editors:

Nedwidek FM. Experimental Studies for the Effects of the Spacer Grid on Two-phase Flow Regime Transition . [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/12327

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

Penn State University

8. Dong, Ting. Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22360

► Wellbore models are required for integrated reservoir management studies as well as the optimization of production operations. Distributed Temperature Sensing (DTS) is a smart well… (more)

▼ Wellbore models are required for integrated reservoir management studies as well as the optimization of production operations. Distributed Temperature Sensing (DTS) is a smart well technology deployed for permanent downhole monitoring. Temperature is measured via fiber optic sensors installed along horizontal wellbores. Correct interpretation of DTS surveys has thus become of utmost importance and analytical models for analysis of temperature distribution behavior are critical. This study conducted a comprehensive thermodynamic analysis to interpret thermal response of horizontal wellbore fluids. A generalized wellbore thermal response model (η_s-driven model) is derived starting from 1-D conservative mass, momentum and energy balance equations. Steady-state velocity, pressure and temperature profiles are presented along with its single-phase and two-phase solution procedures. Steady-state applications are conducted and discussed. In steady state, both single-phase and two-phase flows are considered in both openhole and perforated wellbore conditions. Both the homogeneous and drift-flux models are implemented in two-phase flow, together with the comparison of results between the two models. Results show that for single-phase flow, oil and water are heated, while gas is cooled along the horizontal wellbore; thermal behavior of wellbore fluid is driven by wellbore inclination, flowrate, roughness, radius and completion type. When two-phase flow appears, a temperature derivation compared with single-phase case can be detected from temperature profiles. The effects of each thermal factor on overall thermal response are also discussed in the study for both horizontal and inclined wellbores. Rather than only utilizing the common accepted tool value of Joule Thomson Coefficient to predict heating or cooling effect in wellbore, this study show cases on the importance of Isentropic Thermal Coefficient, which always contributes to cooling. Advisors/Committee Members: Luis F Ayala H, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Horizontal Wellbore; Temperature Prediction; Single Phase flow; Two Phase Flow

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APA (6^th Edition):

Dong, T. (2014). Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22360

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):

Dong, Ting. “Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids.” 2014. Thesis, Penn State University. Accessed April 14, 2021. https://submit-etda.libraries.psu.edu/catalog/22360.

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

MLA Handbook (7^th Edition):

Dong, Ting. “Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids.” 2014. Web. 14 Apr 2021.

Vancouver:

Dong T. Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Apr 14]. Available from: https://submit-etda.libraries.psu.edu/catalog/22360.

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

Council of Science Editors:

Dong T. Thermal Response Modeling and Thermodynamic Analysis of Horizontal Wellbore Fluids. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22360

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

Oregon State University

9. Cullion, Rebecca. Void fraction variations in a fractal-like branching channel network.

Degree: PhD, Mechanical Engineering, 2005, Oregon State University

URL: http://hdl.handle.net/1957/22407

Subjects/Keywords: Two-phase flow

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

APA (6^th Edition):

Cullion, R. (2005). Void fraction variations in a fractal-like branching channel network. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/22407

Chicago Manual of Style (16^th Edition):

Cullion, Rebecca. “Void fraction variations in a fractal-like branching channel network.” 2005. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/22407.

MLA Handbook (7^th Edition):

Cullion, Rebecca. “Void fraction variations in a fractal-like branching channel network.” 2005. Web. 14 Apr 2021.

Vancouver:

Cullion R. Void fraction variations in a fractal-like branching channel network. [Internet] [Doctoral dissertation]. Oregon State University; 2005. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/22407.

Council of Science Editors:

Cullion R. Void fraction variations in a fractal-like branching channel network. [Doctoral Dissertation]. Oregon State University; 2005. Available from: http://hdl.handle.net/1957/22407

Oregon State University

10. Abel, Kent C. Axial development of two-phase flow parameters in a vertical column.

Degree: MS, Nuclear Engineering, 2002, Oregon State University

URL: http://hdl.handle.net/1957/29962

► The next generation of nuclear safety analysis computer codes will include detailed modeling of the interfacial area concentration. The interfacial area concentration is the essence… (more)

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Abel, K. C. (2002). Axial development of two-phase flow parameters in a vertical column. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/29962

Chicago Manual of Style (16^th Edition):

Abel, Kent C. “Axial development of two-phase flow parameters in a vertical column.” 2002. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/29962.

MLA Handbook (7^th Edition):

Abel, Kent C. “Axial development of two-phase flow parameters in a vertical column.” 2002. Web. 14 Apr 2021.

Vancouver:

Abel KC. Axial development of two-phase flow parameters in a vertical column. [Internet] [Masters thesis]. Oregon State University; 2002. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/29962.

Council of Science Editors:

Abel KC. Axial development of two-phase flow parameters in a vertical column. [Masters Thesis]. Oregon State University; 2002. Available from: http://hdl.handle.net/1957/29962

McMaster University

11. 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)

▼

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 April 14, 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. 14 Apr 2021.

Vancouver:

BEHDADI A. MECHANISTIC MODELLING OF CRITICAL HEAT FLUX ON LARGE DIAMETER TUBES. [Internet] [Doctoral dissertation]. McMaster University; 2015. [cited 2021 Apr 14]. 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

Oregon State University

12. McCreary, David M. Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters.

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

URL: http://hdl.handle.net/1957/32921

► This thesis examines two techniques for measuring two-phase flow parameters in an air/water system using intrusive conductivity probes. Specifically, the theoretical derivation for measuring void… (more)

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

McCreary, D. M. (2000). Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/32921

Chicago Manual of Style (16^th Edition):

McCreary, David M. “Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters.” 2000. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/32921.

MLA Handbook (7^th Edition):

McCreary, David M. “Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters.” 2000. Web. 14 Apr 2021.

Vancouver:

McCreary DM. Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters. [Internet] [Masters thesis]. Oregon State University; 2000. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/32921.

Council of Science Editors:

McCreary DM. Design and testing of intrustive conductivity probes for the measurement of two-phase flow parameters. [Masters Thesis]. Oregon State University; 2000. Available from: http://hdl.handle.net/1957/32921

Oregon State University

13. Vierra, George Joseph. A study of climbing-film flow characteristics of various liquids and air in an annular duct.

Degree: PhD, Chemical Engineering, 1971, Oregon State University

URL: http://hdl.handle.net/1957/45158

► Momentum transfer in climbing-film flow in an annular duct was investigated. Air and various liquids, with a wide range of viscosities and surface tensions, were… (more)

▼ Momentum transfer in climbing-film flow in an annular duct was investigated. Air and various liquids, with a wide range of viscosities and surface tensions, were investigated. The two phases flowed co-currently upward, the liquid climbing as a thin film on the inner wail while the outer wall remained dry. The annulus was constructed of a three inch I. D. acrylic plastic tube and a one inch O. D. stainless steel rod. The dry, clear plastic outer wall made determination of pressure losses in the gas phase, radii of the point of maximum velocity, and outer wall shear stresses straightforward. High-speed motion picture photography of the liquid film was used to study the liquid film thickness and the wave character of the liquid surface. It was attempted to determine the effect of the liquid properties on the character of the liquid film and on the hydrodynamics of the air-liquid flow. The liquids used were water, Shellsolv, iso-octyl alcohol and light oil (viscosity ranging from 6.75x10⁻⁴ to 1.22x10⁻² lbm/ft sec and surface tension ranging from 24.4 to 72.75 dyne/cm at 68°F). The experimental investigation covered an air flow range of 7x10⁴<Re<2x10⁵ and a liquid flow range of 0.10 to 0.755 lbm/min. The results of this investigation are subsequently presented. 1. Friction factors for air flowing alone in the annulus were 2% to 13% larger than smooth tube values. The radius at the point of maximum velocity was in agreement with the values predicted by existing empirical correlations. 2. The two-phase pressure losses increased with increases in air and liquid flow rates. At the same liquid flow rate, the pressure losses were larger for the more viscous liquids. 3. The presence of the liquid film flowing on the inner wall caused only small changes in the outer wall shear stress from the single-phase values. Correlations were found for friction factor and Reynolds number using the region between the point of maximum velocity and the outer wall as the hydraulic flow region. In the region of low liquid entrainment the following empirical correlation was found f₂ = .201 Re₂⁻.³²⁶ 4. The radius of the point of maximum velocity increased as the liquid flow rate increased and was larger for the more viscous liquids. The following empirical correlation was found y* = .01 ReL.²⁴⁶μ*.⁴⁸ 5. The two-phase pressure losses were predicted well by the Lockhart and Martinelli correlation over the entire range of the data and for all liquids. 6. The laminar film model gives a reasonable approximation of the liquid film thickness for all the liquids investigated. The data indicate that the film thickness is proportional to the liquid viscosity to the .3 power. 7. Shear stresses at the air-liquid interface were 33% to 52% larger than the outer wall shear stresses and 7% to 130% larger than the inner wall shear stresses. The interfacial and the inner wall shear stresses approach each other at the high air flow rates, indicating the velocity profile in the liquid film is approaching linearity. 8. The… Advisors/Committee Members: Knudsen, James G. (advisor).

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Vierra, G. J. (1971). A study of climbing-film flow characteristics of various liquids and air in an annular duct. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/45158

Chicago Manual of Style (16^th Edition):

Vierra, George Joseph. “A study of climbing-film flow characteristics of various liquids and air in an annular duct.” 1971. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/45158.

MLA Handbook (7^th Edition):

Vierra, George Joseph. “A study of climbing-film flow characteristics of various liquids and air in an annular duct.” 1971. Web. 14 Apr 2021.

Vancouver:

Vierra GJ. A study of climbing-film flow characteristics of various liquids and air in an annular duct. [Internet] [Doctoral dissertation]. Oregon State University; 1971. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/45158.

Council of Science Editors:

Vierra GJ. A study of climbing-film flow characteristics of various liquids and air in an annular duct. [Doctoral Dissertation]. Oregon State University; 1971. Available from: http://hdl.handle.net/1957/45158

Oregon State University

14. Scott, Bruce Douglas. Motion picture study of a vertical climbing film in an annular duct.

Degree: MS, Chemical Engineering, 1969, Oregon State University

URL: http://hdl.handle.net/1957/46543

► This paper describes a study of two-phase gas-liquid vertical annular climbing film flow. Using a high speed Fastax movie camera, motion was slowed sufficiently to… (more)

▼ This paper describes a study of two-phase gas-liquid vertical annular climbing film flow. Using a high speed Fastax movie camera, motion was slowed sufficiently to facilitate detailed analysis of the climbing film structure, based on single frame projections. The dynamic characteristics of the liquid film could likewise be obtained, though these were necessarily of a qualitative nature, A technique based on a diffusion controlled electrochemical reaction was employed to monitor the local instantaneous mass transfer coefficient at the solid-liquid interface. The resultant fluctuating electrical signal was amplified and presented for direct comparison with the climbing film structure, using split image photography. The signal was also subjected to a spectral density analysis to further understanding of the nature of the turbulence produced at the interface. The vertical annular column was constructed of a three-inch inside diameter clear plexiglass tube, with a one-inch outside diameter concentric core, supported laterally by a series of streamlined centering pins. The column extended some 35 feet from the base with all tests carried out approximately midway up the column to minimize end effects. The particular construction of the column permitted an unobstructed view of the free surface of the climbing film. Determination of the pressure gradients was likewise simplified as the inner surface of the outer tube remained essentially dry throughout the experimental program. The air flow rates varied from 172 cfm to 616 cfm at one atmosphere pressure and 68°F, temperature. Liquid flow rates were confined to a range from .19 lbm/min to 1.5 lbm/min so as to stay within the climbing film regime. From the movie film analysis, values for the average film thickness, wave frequency and phase velocity were determined with their respective standard deviations. Two empirical models have been proposed which fit the average film thickness data to within 6%. The film thickness results were also compared with the values predicted by several mathematical models, two of which were based on a modification of Kapitza's original theory. Advisors/Committee Members: Knudsen, James G. (advisor).

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Scott, B. D. (1969). Motion picture study of a vertical climbing film in an annular duct. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46543

Chicago Manual of Style (16^th Edition):

Scott, Bruce Douglas. “Motion picture study of a vertical climbing film in an annular duct.” 1969. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/46543.

MLA Handbook (7^th Edition):

Scott, Bruce Douglas. “Motion picture study of a vertical climbing film in an annular duct.” 1969. Web. 14 Apr 2021.

Vancouver:

Scott BD. Motion picture study of a vertical climbing film in an annular duct. [Internet] [Masters thesis]. Oregon State University; 1969. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/46543.

Council of Science Editors:

Scott BD. Motion picture study of a vertical climbing film in an annular duct. [Masters Thesis]. Oregon State University; 1969. Available from: http://hdl.handle.net/1957/46543

Oregon State University

15. John Anthony Cengel. Viscosity of liquid - liquid dispersions in laminar and turbulent flow.

Degree: MS, Chemical Engineering, 1959, Oregon State University

URL: http://hdl.handle.net/1957/19554

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Cengel, J. A. (1959). Viscosity of liquid - liquid dispersions in laminar and turbulent flow. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/19554

Chicago Manual of Style (16^th Edition):

Cengel, John Anthony. “Viscosity of liquid - liquid dispersions in laminar and turbulent flow.” 1959. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/19554.

MLA Handbook (7^th Edition):

Cengel, John Anthony. “Viscosity of liquid - liquid dispersions in laminar and turbulent flow.” 1959. Web. 14 Apr 2021.

Vancouver:

Cengel JA. Viscosity of liquid - liquid dispersions in laminar and turbulent flow. [Internet] [Masters thesis]. Oregon State University; 1959. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/19554.

Council of Science Editors:

Cengel JA. Viscosity of liquid - liquid dispersions in laminar and turbulent flow. [Masters Thesis]. Oregon State University; 1959. Available from: http://hdl.handle.net/1957/19554

University of Houston

16. Zhang, Lan 1985-. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.

Degree: PhD, Mathematics, 2014, University of Houston

URL: http://hdl.handle.net/10657/1683

► In this dissertation, we present numerical schemes in simulating immiscible two-phase flow problems. The goal of this work is to find unified solutions for numerical… (more)

Subjects/Keywords: Two-phase flow; Level Set method

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APA (6^th Edition):

Zhang, L. 1. (2014). NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1683

Chicago Manual of Style (16^th Edition):

Zhang, Lan 1985-. “NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.” 2014. Doctoral Dissertation, University of Houston. Accessed April 14, 2021. http://hdl.handle.net/10657/1683.

MLA Handbook (7^th Edition):

Zhang, Lan 1985-. “NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.” 2014. Web. 14 Apr 2021.

Vancouver:

Zhang L1. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10657/1683.

Council of Science Editors:

Zhang L1. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1683

Cranfield University

17. Husin, Shuib. An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics.

Degree: PhD, 2011, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/7318

► Bubble and cavitation effects phenomena can be encountered in two-phase gas-liquid systems in industry. In certain industries, particularly high-risk systems such as a nuclear reactor/plant,… (more)

Subjects/Keywords: Acoustic Emission; bubble dynamics; two-phase flow

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APA (6^th Edition):

Husin, S. (2011). An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/7318

Chicago Manual of Style (16^th Edition):

Husin, Shuib. “An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics.” 2011. Doctoral Dissertation, Cranfield University. Accessed April 14, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/7318.

MLA Handbook (7^th Edition):

Husin, Shuib. “An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics.” 2011. Web. 14 Apr 2021.

Vancouver:

Husin S. An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics. [Internet] [Doctoral dissertation]. Cranfield University; 2011. [cited 2021 Apr 14]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7318.

Council of Science Editors:

Husin S. An experimental investigation into the correlation between Acoustic Emission (AE) and bubble dynamics. [Doctoral Dissertation]. Cranfield University; 2011. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7318

Delft University of Technology

18. Bolder, Robin (author). Numerical Simulation of a Two-Phase Thermal Control System.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:5c1f3e42-cdeb-47c7-9e7f-0ffba799b3f9

► Two-phase thermal control systems are used for payloads that require temperature stability under high and fluctuating heat output. However, the complex interaction between the two… (more)

Subjects/Keywords: Two-phase flow; thermal control; numerical modelling

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APA (6^th Edition):

Bolder, R. (. (2017). Numerical Simulation of a Two-Phase Thermal Control System. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:5c1f3e42-cdeb-47c7-9e7f-0ffba799b3f9

Chicago Manual of Style (16^th Edition):

Bolder, Robin (author). “Numerical Simulation of a Two-Phase Thermal Control System.” 2017. Masters Thesis, Delft University of Technology. Accessed April 14, 2021. http://resolver.tudelft.nl/uuid:5c1f3e42-cdeb-47c7-9e7f-0ffba799b3f9.

MLA Handbook (7^th Edition):

Bolder, Robin (author). “Numerical Simulation of a Two-Phase Thermal Control System.” 2017. Web. 14 Apr 2021.

Vancouver:

Bolder R(. Numerical Simulation of a Two-Phase Thermal Control System. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 14]. Available from: http://resolver.tudelft.nl/uuid:5c1f3e42-cdeb-47c7-9e7f-0ffba799b3f9.

Council of Science Editors:

Bolder R(. Numerical Simulation of a Two-Phase Thermal Control System. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:5c1f3e42-cdeb-47c7-9e7f-0ffba799b3f9

Delft University of Technology

19. Kurian, Jesil (author). Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:42d42d0a-bed6-4a48-8dca-21f21e0cbe9f

► The climate change agreements require large investments in renewable energies. However, with the increasing demand for energy, immediately stopping the production and use of fossil… (more)

▼ The climate change agreements require large investments in renewable energies. However, with the increasing demand for energy, immediately stopping the production and use of fossil fuels is not realistic. Natural gas is twice as clean as coal and hence could be considered as a transition fuel, which can help to find a balance between the requirements of fighting climate change and producing more and cleaner energy.The high-pressure, underground reservoirs supply natural gas which is usually wetted with liquid hydrocarbons and water. Natural gas is lifted through a production tubing to the surface, with a relatively high velocity and the drag between the gas and liquid will also bring the oil (or condensate) and water to the surface. However, over time the gas supply from the reservoirs will deplete, which gives a decreasing gas velocity, until liquid starts to fall. This is known as liquid loading, which can finally lead to the killing of the gas production. One of the solutions to operate such aging reservoirs is to reduce the cross-sectional area of the production tubing through making use of an annulus (which actually is the space in between an outer pipe and an inner pipe).Liquid loading is noticed to occur when the flow regime changes from annular flow to churn flow. A good understanding of this multiphase flow behaviour in an annulus is desired. Therefore, this Master Thesis project was devoted to obtaining new experimental data and to develop a model for upward gas-liquid flow in a vertical annulus. Experiments with air and water were carried out in the small-scale flow loop of TNO in Delft. The air and water throughputs were varied, and both concentric and eccentric pipe-in-pipe configurations were measured. Both the pressure drop and liquid holdup were measured. The model is able to predict the pressure gradient and holdup for a range of superficial gas and liquid velocities, using different eccentricities in the annulus configuration. The model predicted the pressure gradient within 10% of the experimental values at high superficial liquid velocities (>0.5 cm/s). However, for a superficial liquid velocity of 0.5 cm/s, the model was overpredicting the pressure drop by 100%, which could be attributed to the partial dry-out on the tube walls. To determine the superficial gas velocity, for a given pressure drop and holdup, a modified version of the Wallis correlation was used for the interfacial friction factor. The gas velocity was predicted within 5 to 10% at low holdups (< 0.075). For higher holdups the gas velocity was overpredicted by about 40%. The primary modifications made to the model for the eccentric cases are based on applying a number of grid cells in circular direction allowing for the inclusion of a closure for the variation of the circular film thickness both at the inner and at the outer pipe wall. A verification of the closure of the amplitude or of the closure of the film thickness variation is required to confirm the dependency between this parameter, the eccentricity and the holdup.… Advisors/Committee Members: Henkes, Ruud (mentor), Tummers, Mark (graduation committee), van Oudheusden, Bas (graduation committee), van 't Westende, J.M.C. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Two-phase flow; Annulus; Eccentricity; Liquid loading

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APA (6^th Edition):

Kurian, J. (. (2018). Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:42d42d0a-bed6-4a48-8dca-21f21e0cbe9f

Chicago Manual of Style (16^th Edition):

Kurian, Jesil (author). “Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus.” 2018. Masters Thesis, Delft University of Technology. Accessed April 14, 2021. http://resolver.tudelft.nl/uuid:42d42d0a-bed6-4a48-8dca-21f21e0cbe9f.

MLA Handbook (7^th Edition):

Kurian, Jesil (author). “Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus.” 2018. Web. 14 Apr 2021.

Vancouver:

Kurian J(. Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Apr 14]. Available from: http://resolver.tudelft.nl/uuid:42d42d0a-bed6-4a48-8dca-21f21e0cbe9f.

Council of Science Editors:

Kurian J(. Experiments and Modelling of Gas-Liquid Flow in a Vertical Annulus. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:42d42d0a-bed6-4a48-8dca-21f21e0cbe9f

Delft University of Technology

20. Joshi, Ankit (author). Numerical study of heat transfer in two-phase flows.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b8d2fab9-d6a9-418b-b787-166a5d754310

►

Heat transfer in multiphase flow plays an important role in nature and in numerous industries such as petrochemical, automotive, food processing, ocean engineering etc. It… (more)

▼

Heat transfer in multiphase flow plays an important role in nature and in numerous industries such as petrochemical, automotive, food processing, ocean engineering etc. It is becoming increasingly crucial to design more efficient industrial systems to reduce the environmental impact of industrial activities because of global warming and growing awareness about sustainability. To design these efficient systems it is important to thoroughly understand the details of heat transfer in multiphase flow. This thesis follows the method of Direct Numerical Simulation (DNS) to provide a detailed physical insight of the fluid motion and heat transfer in the model. To accurately model the two phase flow the Coupled Level Set Volume Of Fluid (CLSVOF) method is used. The main advantage of using the CLSVOF method is that it can accurately capture the interface geometry and it has excellent volume conservation capability. The work presented here is an extension to an in-house code developed at TU Delft for Direct Numerical Simulation of two-phase flows using the CLSVOF method. The existing code has been thoroughly validated for the fluid and interface motion but the validation of the heat transfer model remains an unaccomplished task till now. Therefore, the main objective of this thesis is to validate the heat transfer model and then to study the heat transfer in droplets coalescence using this model. The validation of the heat transfer model was accomplished by calculating the Nusselt number distribution over a bubble surface and comparing it to the available literature. Both the model results and the information from the literature showed very good agreement with each other. After completing the model validation, this model was used to study the heat transfer phenomenon between two coalescing droplets and the surrounding fluid. The results of the droplets coalescence are as per the expectations and are discussed in detail in this thesis. In the process of doing these analyses different ways of calculating the local Nusselt number and the global Nusselt number have been discussed. The validation of the heat transfer model and the analysis done for the case of coalescing droplets paves the way for conducting more complex heat transfer analysis in two-phase flows using this model.

Mechanical Engineering

Advisors/Committee Members: Boersma, Bendiks Jan (mentor), Nemati, Hassan (mentor), Pecnik, Rene (graduation committee), Breugem, Wim-Paul (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Heat transfer; Two phase; Bubbly flow

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APA (6^th Edition):

Joshi, A. (. (2018). Numerical study of heat transfer in two-phase flows. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b8d2fab9-d6a9-418b-b787-166a5d754310

Chicago Manual of Style (16^th Edition):

Joshi, Ankit (author). “Numerical study of heat transfer in two-phase flows.” 2018. Masters Thesis, Delft University of Technology. Accessed April 14, 2021. http://resolver.tudelft.nl/uuid:b8d2fab9-d6a9-418b-b787-166a5d754310.

MLA Handbook (7^th Edition):

Joshi, Ankit (author). “Numerical study of heat transfer in two-phase flows.” 2018. Web. 14 Apr 2021.

Vancouver:

Joshi A(. Numerical study of heat transfer in two-phase flows. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Apr 14]. Available from: http://resolver.tudelft.nl/uuid:b8d2fab9-d6a9-418b-b787-166a5d754310.

Council of Science Editors:

Joshi A(. Numerical study of heat transfer in two-phase flows. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:b8d2fab9-d6a9-418b-b787-166a5d754310

Virginia Tech

21. Clark, Randy R. Jr. Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow.

Degree: PhD, Mechanical Engineering, 2015, Virginia Tech

URL: http://hdl.handle.net/10919/56953

► In this study, liquid-vapor vertical upflow has been research with the intent of finding an improved method of modelling the interphase friction in two-phase vertical… (more)

▼ In this study, liquid-vapor vertical upflow has been research with the intent of finding an improved method of modelling the interphase friction in two-phase vertical flow in nuclear thermal-hydraulic codes. An improved method of modelling interphase friction should allow for better prediction of pressure gradient, void fraction and the phasic velocities. Data has been acquired from several available published resources and analyzed to determine the interphase friction using a force balance between the liquid and vapor phases. Using the Buckingham Pi Theorem, a dimensionless interphase friction force was tested and refined before being compared against seven other dimensionless parameters. Three correlations have been developed that establish a dimensionless interphase friction force as a function of the Weber number, the Froude number and the mixture Froude number. Statistical analysis of the three correlations shows that the mixture Froude number correlation should be the most accurate correlation. The correlations have a weakness that makes them ineffective mostly for bubbly flow and some slug flow scenarios, while they should perform significantly better for annular flow cases. Comparisons have been made against the interphase friction calculations published in the manuals of RELAP5/MOD2, RELAP5/MOD3.3, RELAP5-3D and TRACE. The findings have generally shown that the equations in the manuals provide very inaccurate approximations of the interphase friction compared to the interphase friction that was found via force balance. When analyzing the source code of RELAP5/MOD3.3, several differences were noticed between the source code and manual, which have been discussed. Calculations with the source code equations reveal that the source code provides a modestly improved prediction of the interphase friction force, but still has significant errors. Despite the fact that the manual and source code equations indicate that RELAP5/MOD3.3 should perform poorly in modelling interphase friction, actual RELAP5/MOD3.3 model runs perform very well in predicting pressure gradient, void fraction, the liquid and vapor velocities and the interphase friction force. This is largely due to RELAP5/MOD3.3 being able to adjust parameters to converge to a solution that fits within the boundary conditions established in the input file. Modifications to the RELAP5/MOD3.3 code were first made with the three correlations developed using dimensionless parameters, and were tested with data points that the RELAP5/MOD3.3 flow regime map had predicted would be annular flow. While the mixture Froude number correlation has been analyzed to be the most statistically accurate of the three correlations, it was found that the Weber number correlation performed best when implemented into RELAP5/MOD3.3. In a parametric study of the Weber number correlation, it performed optimally at 150% of the original correlation, improving upon the original RELAP model in almost every metric examined. Additional investigations were… Advisors/Committee Members: Kornhauser, Alan A. (committeechair), Liu, Yang (committee member), Pierson, Mark A. (committee member), Tafti, Danesh K. (committee member), Jones, John Hamilton (committee member).

Subjects/Keywords: Two-Phase Flow; Interphase Friction; RELAP

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APA (6^th Edition):

Clark, R. R. J. (2015). Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/56953

Chicago Manual of Style (16^th Edition):

Clark, Randy R Jr. “Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow.” 2015. Doctoral Dissertation, Virginia Tech. Accessed April 14, 2021. http://hdl.handle.net/10919/56953.

MLA Handbook (7^th Edition):

Clark, Randy R Jr. “Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow.” 2015. Web. 14 Apr 2021.

Vancouver:

Clark RRJ. Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10919/56953.

Council of Science Editors:

Clark RRJ. Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/56953

Georgia Tech

22. Saha, P. (Pradip). Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases.

Degree: PhD, Mechanical engineering, 1974, Georgia Tech

URL: http://hdl.handle.net/1853/18953

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Saha, P. (. (1974). Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/18953

Chicago Manual of Style (16^th Edition):

Saha, P (Pradip). “Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases.” 1974. Doctoral Dissertation, Georgia Tech. Accessed April 14, 2021. http://hdl.handle.net/1853/18953.

MLA Handbook (7^th Edition):

Saha, P (Pradip). “Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases.” 1974. Web. 14 Apr 2021.

Vancouver:

Saha P(. Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases. [Internet] [Doctoral dissertation]. Georgia Tech; 1974. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1853/18953.

Council of Science Editors:

Saha P(. Thermally induced two-phase flow instabilities, including the effect of thermal non-equilibrium between the phases. [Doctoral Dissertation]. Georgia Tech; 1974. Available from: http://hdl.handle.net/1853/18953

Georgia Tech

23. Lubbers, Douglass Stephen. An investigation of two-phase flows with evaporation.

Degree: MS, Mechanical engineering, 1974, Georgia Tech

URL: http://hdl.handle.net/1853/15897

Subjects/Keywords: Two-phase flow

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APA (6^th Edition):

Lubbers, D. S. (1974). An investigation of two-phase flows with evaporation. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/15897

Chicago Manual of Style (16^th Edition):

Lubbers, Douglass Stephen. “An investigation of two-phase flows with evaporation.” 1974. Masters Thesis, Georgia Tech. Accessed April 14, 2021. http://hdl.handle.net/1853/15897.

MLA Handbook (7^th Edition):

Lubbers, Douglass Stephen. “An investigation of two-phase flows with evaporation.” 1974. Web. 14 Apr 2021.

Vancouver:

Lubbers DS. An investigation of two-phase flows with evaporation. [Internet] [Masters thesis]. Georgia Tech; 1974. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1853/15897.

Council of Science Editors:

Lubbers DS. An investigation of two-phase flows with evaporation. [Masters Thesis]. Georgia Tech; 1974. Available from: http://hdl.handle.net/1853/15897

24. Chen, Xiaoming. Droplet-based Microfluidic Chip Design for High Throughput Screening Applications.

Degree: 2015, University of Waterloo

URL: http://hdl.handle.net/10012/10045

► Droplet-based microfluidics has been considered as a prospective tool for high throughput screening analysis, which is highly demanded in a wide range of areas including… (more)

▼ Droplet-based microfluidics has been considered as a prospective tool for high throughput screening analysis, which is highly demanded in a wide range of areas including but not limited to life science research, drug discovery, material synthesis and environmental monitoring. Low sample consumption, reduced reaction time, high throughput manipulation, fast mixing, and prevention of cross contamination at channel walls are just some of the benefits of droplet-based microfluidics. Although extensive research efforts have been reported in the study of droplet-based microfluidics over the past decades, it has yet to be widely commercialized. One of the challenges that limit droplet microfluidic chips from being commercialized is the difficulty in integrating multiple functions robustly without increasing the device footprint. Major functionalities of interest include generating droplets with controlled volume and frequency, and precisely controlling and manipulating each individual droplet such as sorting, detecting, merging, splitting, pairing, mixing, trapping, releasing, long term and short term storing, etc. Since many of these functionalities rely on the accuracy of droplet generation which is the first step, it is crucial to investigate the droplet formation process and understand how to design microfluidic structures to manipulate each individual droplet effectively. To this end, this thesis started with a fundamental study of droplet generation in a flow focusing geometry based on extensive experimental data, from which a physical model was developed to describe droplet formation processes, then move on to study droplet generation in a geometry with two junctions in series, with the goal of improving single encapsulation (one particle per droplet) efficiency. Later, droplet merging towards whole genome amplification and drug screening applications was investigated, and finally a microfluidic chip integrated with multiple functionalities was developed, and its robustness was validated. The first project studied the fundamental principles of liquid-liquid droplet generation in a flow focusing device. This work presents a 3D physical model with less fitting parameters than existing ones. The model describes droplet formation process in flow focusing devices operating in the squeezing regime, where droplet size is usually larger than the channel width, and was developed based on a systematic and extensive experimental study. In particular, it incorporates an accurate geometric description of the 3D droplet shape during the formation process, an estimation of the time period for the formation cycle based on the conservation of mass, and a semi-analytical model predicting the pressure drop over the 3D corner gutter between the droplet curvature and channel walls, which allows droplet size, spacing and formation frequency to be determined accurately. The model takes into account change in channel geometry (height to width ratio), viscosity contrast, flow rate ratio and capillary number with a wide variety. In the…

Subjects/Keywords: Microfluidics; Two phase flow; Droplet; Chip design

11 more images…

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APA (6^th Edition):

Chen, X. (2015). Droplet-based Microfluidic Chip Design for High Throughput Screening Applications. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10045

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):

Chen, Xiaoming. “Droplet-based Microfluidic Chip Design for High Throughput Screening Applications.” 2015. Thesis, University of Waterloo. Accessed April 14, 2021. http://hdl.handle.net/10012/10045.

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

MLA Handbook (7^th Edition):

Chen, Xiaoming. “Droplet-based Microfluidic Chip Design for High Throughput Screening Applications.” 2015. Web. 14 Apr 2021.

Vancouver:

Chen X. Droplet-based Microfluidic Chip Design for High Throughput Screening Applications. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10012/10045.

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

Council of Science Editors:

Chen X. Droplet-based Microfluidic Chip Design for High Throughput Screening Applications. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/10045

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

University of Guelph

25. Shallouf, Mohammad. Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems.

Degree: Master of Applied Science, School of Engineering, 2019, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14753

► The airlift pump has been around since the late 18th century, yet it is rarely seen or used in industry. Recently, the aquaculture industry has… (more)

Subjects/Keywords: CFD; Numerical Simulation; Two-Phase Flow

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APA (6^th Edition):

Shallouf, M. (2019). Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14753

Chicago Manual of Style (16^th Edition):

Shallouf, Mohammad. “Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems.” 2019. Masters Thesis, University of Guelph. Accessed April 14, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14753.

MLA Handbook (7^th Edition):

Shallouf, Mohammad. “Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems.” 2019. Web. 14 Apr 2021.

Vancouver:

Shallouf M. Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems. [Internet] [Masters thesis]. University of Guelph; 2019. [cited 2021 Apr 14]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14753.

Council of Science Editors:

Shallouf M. Numerical Simulation of Airlift Pumps Operating under Two-Phase Flow Conditions for Aquaculture Systems. [Masters Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14753

Virginia Tech

26. Clark, Randy Raymond. Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2.

Degree: MS, Mechanical Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/76861

► The purpose of this study is to develop an accurate model of the downcomer of the once-through steam generator (OTSG) developed by Babcock & Wilcox,… (more)

▼ The purpose of this study is to develop an accurate model of the downcomer of the once-through steam generator (OTSG) developed by Babcock & Wilcox, using RELAP5/MOD2. While the physical model can be easily developed, several parameters are left to be adjusted to optimally model the downcomer and match data that was retrieved in a first-of-a-kind (FOAK) study conducted at Oconee Unit I in Oconee, South Carolina. Once the best-fit set of parameters has been determined, then the model must be tested for power levels exceeding that for which the steam generator was originally designed, so as to determine the power level at which a phenomenon known as flood-back becomes a concern. All known previous studies that have been conducted using RELAP5/MOD2 have shown that RELAP over-predicts interphase friction. However, all of those studies focused on heated two-phase upflow, whereas the downcomer is modeled as adiabatic two-phase downflow. In this study, it is found that the original slug drag model for RELAP5/MOD2 developed by Idaho National Engineering Laboratory (INEL) under-predicts the interphase friction between the liquid and vapor phase within the downcomer. Using a modified version of the original slug drag model created by Babcock & Wilcox (B&W), an optimum multiplier is found for each power level. An increase of 1181% in interphase friction over the INEL slug drag model, which equals an increase of 4347% for the default B&W model provides the most accurate results for all power levels studied. Emphasis is also placed on modeling the orifice plate of the OTSG downcomer which has been added to stabilize pressure fluctuations between the downcomer and tube bundle of the OTSG. While several different schemes are explored for modeling the orifice plate, a branch connection with an inlet area 14.22% of that of the downcomer is used to model the orifice plate along with the volume that transitions the two-phase downflow to horizontal flow into the tube nest of the OTSG. Power levels exceeding that for which the steam generator was designed are tested in RELAP using the slug drag multiplier to determine at which power level a liquid level would occur and would flood-back become a concern. In this study, it is determined that a liquid level would form at 135% power and that at any higher power level, flood-back would be of concern for any user of the steam generator. Advisors/Committee Members: Kornhauser, Alan A. (committeechair), Pierson, Mark A. (committee member), Tafti, Danesh K. (committee member).

Subjects/Keywords: Thermohydraulics; Two-Phase Flow; Steam Generator; RELAP

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APA (6^th Edition):

Clark, R. R. (2011). Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/76861

Chicago Manual of Style (16^th Edition):

Clark, Randy Raymond. “Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2.” 2011. Masters Thesis, Virginia Tech. Accessed April 14, 2021. http://hdl.handle.net/10919/76861.

MLA Handbook (7^th Edition):

Clark, Randy Raymond. “Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2.” 2011. Web. 14 Apr 2021.

Vancouver:

Clark RR. Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10919/76861.

Council of Science Editors:

Clark RR. Modeling Two-Phase Flow in the Downcomer of a Once-Through Steam Generator using RELAP5/MOD2. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/76861

University of Missouri – Columbia

27. Pouryoussefi, Sam, 1982-. Numerical investigation of two phase flow using automatic controller system and chaotic approach.

Degree: 2016, University of Missouri – Columbia

URL: https://doi.org/10.32469/10355/56829

► An automatic and intelligent system to recognize the two-phase water-air flow regime in a vertical tube based on fuzzy logic and genetic algorithm is proposed.… (more)

▼ An automatic and intelligent system to recognize the two-phase water-air flow regime in a vertical tube based on fuzzy logic and genetic algorithm is proposed. Two approaches, volume of fluid (VOF) and Eulerian model, were used for the numerical simulation of gas-liquid two-phase flow. Four different turbulence models, i.e., k-[epsilon] RNG, k-[epsilon] standard, Reynolds stress and k-[epsilon] realizable, were employed. Image processing procedure was implemented to obtain the flow pattern. It was found that the k-[epsilon] RNG gives best results for turbulence modeling and the fuzzy logic code predicts the flow pattern well. In addition, in the present study investigation of chaotic flow in a two and three dimensional closed-loop pulsating heat pipe has been carried out numerically. Constant temperature and heat flux boundary conditions have been applied for the heating (evaporator) section and only constant temperature for cooling (condenser) section. Water and ethanol were as used as working fluids. Volume of Fluid (VOF) method has been employed for two-phase flow simulation. Volume fraction of liquid and vapor in the pulsating heat pipe was investigated under different operating conditions. Approaches such as spectral analysis of temperature time series, correlation dimension, autocorrelation function, Lyapunov exponent and phase space reconstruction were used to investigate chaos in the pulsating heat pipe. Thermal resistance behavior was analyzed with respect to heating power and optimal points were found in case of thermal performance of the pulsating heat pipe. Spectral analysis of temperature time series using Power Spectrum Density showed existence of dominant peak in PSD diagram indicates periodic or quasiperiodic behavior in temperature oscillations at particular frequencies. Correlation dimension values for ethanol were higher than water under the same operating conditions. High values of correlation dimension referred to high frequency, small scale temperature oscillations, caused by miniature bubbles or short vapor plugs dynamically flowing in PHP tubes. Decay of autocorrelation function with respect to time indicated finite prediction ability of the system. Change in working fluid did not lead to any particular conclusion for ACF behavior. An O-ring structure pattern was obtained for reconstructed 3D attractor at periodic or quasi-periodic behavior of temperature oscillations. Advisors/Committee Members: Zhang, Yuwen, 1965- (advisor).

Subjects/Keywords: Two-phase flow – Research; Fuzzy logic

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APA (6^th Edition):

Pouryoussefi, Sam, 1. (2016). Numerical investigation of two phase flow using automatic controller system and chaotic approach. (Thesis). University of Missouri – Columbia. Retrieved from https://doi.org/10.32469/10355/56829

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):

Pouryoussefi, Sam, 1982-. “Numerical investigation of two phase flow using automatic controller system and chaotic approach.” 2016. Thesis, University of Missouri – Columbia. Accessed April 14, 2021. https://doi.org/10.32469/10355/56829.

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

MLA Handbook (7^th Edition):

Pouryoussefi, Sam, 1982-. “Numerical investigation of two phase flow using automatic controller system and chaotic approach.” 2016. Web. 14 Apr 2021.

Vancouver:

Pouryoussefi, Sam 1. Numerical investigation of two phase flow using automatic controller system and chaotic approach. [Internet] [Thesis]. University of Missouri – Columbia; 2016. [cited 2021 Apr 14]. Available from: https://doi.org/10.32469/10355/56829.

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

Council of Science Editors:

Pouryoussefi, Sam 1. Numerical investigation of two phase flow using automatic controller system and chaotic approach. [Thesis]. University of Missouri – Columbia; 2016. Available from: https://doi.org/10.32469/10355/56829

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

Brunel University

28. Al Gaheeshi, Asseel Majed Rasheed. Flow boiling in vertical small to micro scale tubes.

Degree: PhD, 2018, Brunel University

URL: http://bura.brunel.ac.uk/handle/2438/16667 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765009

► The growing demand for the development of efficient miniature cooling systems has led to stimulating numerous investigations on two-phase flow boiling in small to microscale… (more)

Subjects/Keywords: 621.402; Flow boiling; Two-phase flow patterns; Two-phase pressure drop; Two-phase heat transfer coefficient; Coating effect

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APA (6^th Edition):

Al Gaheeshi, A. M. R. (2018). Flow boiling in vertical small to micro scale tubes. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/16667 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765009

Chicago Manual of Style (16^th Edition):

Al Gaheeshi, Asseel Majed Rasheed. “Flow boiling in vertical small to micro scale tubes.” 2018. Doctoral Dissertation, Brunel University. Accessed April 14, 2021. http://bura.brunel.ac.uk/handle/2438/16667 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765009.

MLA Handbook (7^th Edition):

Al Gaheeshi, Asseel Majed Rasheed. “Flow boiling in vertical small to micro scale tubes.” 2018. Web. 14 Apr 2021.

Vancouver:

Al Gaheeshi AMR. Flow boiling in vertical small to micro scale tubes. [Internet] [Doctoral dissertation]. Brunel University; 2018. [cited 2021 Apr 14]. Available from: http://bura.brunel.ac.uk/handle/2438/16667 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765009.

Council of Science Editors:

Al Gaheeshi AMR. Flow boiling in vertical small to micro scale tubes. [Doctoral Dissertation]. Brunel University; 2018. Available from: http://bura.brunel.ac.uk/handle/2438/16667 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.765009

Louisiana State University

29. Posada, Catalina. Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores.

Degree: MS, Petroleum Engineering, 2014, Louisiana State University

URL: etd-11152014-115047 ; https://digitalcommons.lsu.edu/gradschool_theses/4194

► Producing oil and gas from marginal hydrocarbon reservoirs and mature fields present particular challenges. One of the challenges for these types of fields is flow… (more)

▼ Producing oil and gas from marginal hydrocarbon reservoirs and mature fields present particular challenges. One of the challenges for these types of fields is flow instability. Pipeline risers and artificial gas-lift systems experience instabilities, which cause significant reductions in production among others operational drawbacks. Different types of instabilities (static and dynamic) have been identified affecting those systems. However, there is still a lack of systematic investigations associated with the understanding of dynamic instabilities (periodic oscillations) and their impact in production systems. A systematic investigation of the effects of periodic forced oscillations on gas-liquid flows in a 42 m (140-ft) long, 0.04859 m (2-in) ID vertical pipe system has been carried out in the present study. The main objective of this investigation is to characterize the effect of oscillations on two-phase flow in vertical pipes to better understand this phenomenon. The time variation of liquid holdup, pressure drop and pressure gradient were analyzed under two superficial liquid velocities (Uls= 0.017 and 0.3 m/s), and three superficial gas velocities ranges of oscillation (Ugs=3-9, 9.5-14, and 8.5-21.5 m/s), as well as the impact in the flow regimes. For the range of conditions tested, it is possible to conclude that the axial variation of liquid holdup is directly affected by the periodic forced oscillations of the inlet gas flow rate, depending on the superficial liquid velocity. Additionally, experimental data under oscillatory and steady-state conditions were compared for similar superficial liquid and gas velocities. From the experimental results was observed that the pressure gradient was lower for oscillatory conditions than for steady-state conditions, for superficial gas velocity in between 4.0 and 9.0 m/s and superficial liquid velocity of 0.017 m/s. This behavior was correlated to the influence of the forced oscillated gas flow rate on the liquid holdup under those conditions. The experimental results of liquid holdup and pressure gradient were also compared with different two-phase flow models to evaluate its performance under steady-state and oscillatory conditions. Beggs and Brill (1973) was found to be the best fit for the steady-state conditions tested. Among all models tested, the empirical correlation developed in this work (which was obtained from the steady-state data) showed the best agreement for the oscillatory experiments.

Subjects/Keywords: Flow instabilities; flow regimes; transient phenomenon; two-phase flow correlations

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APA (6^th Edition):

Posada, C. (2014). Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores. (Masters Thesis). Louisiana State University. Retrieved from etd-11152014-115047 ; https://digitalcommons.lsu.edu/gradschool_theses/4194

Chicago Manual of Style (16^th Edition):

Posada, Catalina. “Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores.” 2014. Masters Thesis, Louisiana State University. Accessed April 14, 2021. etd-11152014-115047 ; https://digitalcommons.lsu.edu/gradschool_theses/4194.

MLA Handbook (7^th Edition):

Posada, Catalina. “Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores.” 2014. Web. 14 Apr 2021.

Vancouver:

Posada C. Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores. [Internet] [Masters thesis]. Louisiana State University; 2014. [cited 2021 Apr 14]. Available from: etd-11152014-115047 ; https://digitalcommons.lsu.edu/gradschool_theses/4194.

Council of Science Editors:

Posada C. Effect of Forced Flow Oscillation on Churn and Annular Flow in Vertical Wellbores. [Masters Thesis]. Louisiana State University; 2014. Available from: etd-11152014-115047 ; https://digitalcommons.lsu.edu/gradschool_theses/4194

NSYSU

30. Tsai, Cheng-En. Mechanism of a bubble entrapped in solid as a pore during solidification.

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

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706115-095854

► This study applies the phase- field method to simulate pore shapes in solid, and explore mechanisms responsible for pore formation. The simulation method used is… (more)

Subjects/Keywords: bubble; two-phase flow; Phase field; pore formation

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APA (6^th Edition):

Tsai, C. (2015). Mechanism of a bubble entrapped in solid as a pore during solidification. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706115-095854

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):

Tsai, Cheng-En. “Mechanism of a bubble entrapped in solid as a pore during solidification.” 2015. Thesis, NSYSU. Accessed April 14, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706115-095854.

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

MLA Handbook (7^th Edition):

Tsai, Cheng-En. “Mechanism of a bubble entrapped in solid as a pore during solidification.” 2015. Web. 14 Apr 2021.

Vancouver:

Tsai C. Mechanism of a bubble entrapped in solid as a pore during solidification. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Apr 14]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706115-095854.

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

Council of Science Editors:

Tsai C. Mechanism of a bubble entrapped in solid as a pore during solidification. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706115-095854

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

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