Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Two-phase heat transfer"”.
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Solid to liquid and liquid to vapor two phase heat transfer enhancement approaches
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Experiments on two-phase heat transfer regimes in vertical downward flow: From nucleate to film boiling
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Convection and Flow Boiling in Microgaps and Porous Foam Coolers
… material (TIM), is examined. The single phase heat transfer and pressure drop results of water are used to validate a detailed numerical model and, together with the convective FC-72 data, establish a baseline for microgap cooler performance. The two-phase heat transfer characteristics of …
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Heat transfer in upward flowing two-phase gas-liquid mixtures. An experimental study of heat transfer in two-phase gas-liquid mixtures flowing upwards in a vertical tube with liquid phase being driven by a pump or air injection.
… investigation has been carried out to study the heat transfer in a two-phase two-component mixture flowing upward inside a 1" double pipe heat exchanger. The heat transfer coefficient was measured using either air to lift the liquid (air-lift system) or a mechanical pump. The heat transfer …
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Heat transfer rates for filmwise, dropwise, and superhydrophobic condensation on silicon substrates
Condensation, a two-phase heat transfer processes, is commonly utilized in industrial systems. Condensation heat transfer can be optimized by using surfaces in which dropwise condensation (DWC) occurs, and even further optimized using superhydrophobic surfaces. For superhydrophobic condensation, a …
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Probabilistic Flow Regime Map Modeling of Two -Phase Flow
… of this investigation is to develop models for two-phase heat transfer, void fraction, and pressure drop, three key design parameters, in single, smooth, horizontal tubes using a common probabilistic two-phase flow regime basis. Probabilistic two-phase flow maps are experimentally developed for …
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ENHANCEMENT OF SATURATION BOILING OF PF-5060 DIELECTRIC LIQUID ON MICROPOROUS SURFACES
… nucleate boiling and increasing the Critical Heat Flux (CHF) of PF-5060 dielectric liquid and the potential application of the results to immersion cooling of high power computer chips. MPC surfaces of different thicknesses (80—230 \uf06dm), fabricated using conventional electrochemical …
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Droplet evaporation dynamics on surfaces
… in nanotechnology, many surfaces for two phase heat transfer have been developed including hydrophobic, biphilic and lubricantinfused surfaces. However, evaporation of droplets on these surfaces have not been explored in depth. Traditionally, evaporation on surfaces was characterized …
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Numerical and experimental investigation of composite heat pipe technology
Heat pipes are heat transport devices that pose very small thermal resistance to heat flow, even over relatively long transport paths. Utilizing two-phase heat transfer, they can transport heat from con fined spaces to remote heat sinks where more surface area might be readily available. This …
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Development of a liquid-fueled micro-combustor
… stored in hydrocarbon fuels, microscale heat engines based on them are estimated to have specific energies about one order of magnitude higher than those of current battery systems. In addition, utilizing a commonly available logistics fuel would provide advantages for military …
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Single-Phase Heat Transfer Effects of Mixing Vane Geometries in a Narrow Rectangular Channel
… vane geometries enhance the fuel-to-coolant heat transfer within nuclear reactors, which allows for more efficient use of power reactors. At the same time, their presence affects the critical heat flux (CHF), the upper limit to power produced by the reactor, within the reactor. Numerical …
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Desing of the high Pressure HIgh temperature annuLUS flow (PHILUS) Facility
Critical heat flux (CHF) and post-CHF are two critical phenomena in light water-cooled nuclear power plants regarding safety. Even though the general trends of CHF and post- CHF are known, the exact mechanisms are still unknown. To better understand CHF and post-CHF, experimental flow boiling …
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Thermal-hydraulic characterization of single- and two-phase immersion cooling for electronic modules
… board (PCB) assemblies routinely dissipate heat fluxes that exceed the capabilities of conventional air-cooled heat sinks and even many single-phase liquid cooling solutions. At the same time, reliability requirements and space constraints in data centers, defense systems, and transportation …
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Experimental investigation of two-phase immersion cooling of cylindrical lithium-ion cell with a low boiling point dielectric fluid
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Thermohydraulics and suppression of nucleate boiling in upward two-phase annular flow : probing multiscale physics by innovative diagnostics
… quality increases along the assembly's length as heat is transferred from the fuel rods to the water coolant. Nucleate boiling is the dominant heat transfer mechanism at low and intermediate steam qualities (typical of the bubbly and slug/churn flow regimes), while forced convective evaporation …
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Investigation of heat transfer in metal-foam tubes
… attract increasing attention in making compact heat exchangers due to its advanced thermal properties. In this project, the performance of forced convection and flow boiling heat transfer in metal-foam tubes has been investigated experimentally and theoretically. Compared to those of plain …
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Micro and nanostructured surfaces for enhanced phase change heat transfer
Two-phase microchannel heat sinks are of significant interest for thermal management applications, where the latent heat of vaporization offers an efficient method to dissipate large heat fluxes in a compact device. However, a significant challenge for the implementation of microchannel heat sinks …
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Study of turbulent single-phase heat transfer and onset of nucleate boiling in high aspect ratio mini-channels to support the MITR LEU conversion/
Heat transfer in high aspect ratio mini-channels has important applications for materials test reactors using plate-type fuel. These fuel plates typically possess coolant channels with hydraulic diameters on the order of 4 mm or less. The single and two-phase heat transfer in such channels has not …
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Novel Charging Station and Computational Modeling for High Thermal Conductivity Heat Pipe Thermal Ground Planes
… are planar, thin (thickness of 3 mm or less) heat pipes which use two-phase heat transfer. TGPs are innovative high-performance, integrated systems able to operate at a high power density with a reduced weight and temperature gradient. Moreover, being able to dissipate large amounts of heat, …
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