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51	Modeling in-situ vapor extraction during flow boiling in microscale channel Salakij, Saran 25 March 2014 (has links) In-situ vapor extraction is performed by applying a pressure differential across a hydrophobic porous membrane that forms a wall of the channel as a means of reducing the local quality of flow boiling within the channel. As the local quality is reduced, the heat transfer capability can be improve while large pressure drops and flow instability can be mitigated. The present study investigates the potential of vapor extraction, by examining the characteristics and mechanisms of extraction. The physics based models for transition among extraction regimes are developed which can be used as a basis for a regime-based vapor extraction rate model. The effects of vapor extraction on flow boiling in a microscale fractal-like branching network and diverging channels are studied by using a one-dimensional numerical model based on conservation of mass and energy, along with heat transfer and pressure drop correlations. The results show the improvement in reduced pressure drop and enhanced flow stability, and show the potential of heat transfer enhancement. / Graduation date: 2013 / Access restricted to the OSU Community at author's request from March 25, 2013 - March 25, 2014 Vapor extraction Venting Vapor separation Two-phase flow Flow boiling Heat transfer Regime map Extraction map One-dimensional model Numerical model Flow instability Microfluidics -- Mathematical models Ebullition -- Mathematical models Vapors -- Mathematical models Two-phase flow -- Mathematical models
52	Development of Universal Databases and Predictive Tools for Two-Phase Heat Transfer and Pressure Drop in Cryogenic Flow Boiling Heated Tube Experiments Vishwanath Ganesan (7650614) 03 August 2023 (has links) <p>In this study, universal databases and semi-empirical correlations are developed for cryogenic two-phase heat transfer and pressure drop in heated tubes undergoing flow boiling.</p> Turbulent flows two-phase flow heat transfer pressure drop flow boiling boiling curve nucleate boiling critical heat flux film boiling minimum heat flux rewet temperature cryogens liquid helium liquid hydrogen liquid neon liquid nitrogen liquid argon liquid methane correlation database heat transfer coefficient pressure gradient nonequilibrium
53	Experimental Investigations and Theoretical/Empirical Analyses of Forced-Convective Boiling of Confined Impinging Jets and Flows through Annuli and Channels V.S. Devahdhanush (13119831) 21 July 2022 (has links) <p>This study comprises experimental investigations and theoretical/empirical analyses of three forced-convective (pumped) boiling schemes: (i) confined round single jet and jet array impingement boiling, and flow boiling through conventional-sized (ii) concentric circular annuli and (iii) rectangular channels. These schemes could be utilized in the thermal management of various applications including high-heat-flux electronic devices, power devices, electric vehicle charging cables, avionics, future space vehicles, etc.</p> Turbulent flows two-phase flows forced-convective boiling flow boiling critical heat flux jet impingement confined jets thermal management electric vehicles charging system design recommendations two-phase heat transfer coefficient high-speed-video photography orientation effects nucleate boiling degradation subcooled liquid inlet saturated liquid-vapor-mixture inlet Earth gravity partial heating

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