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 27 for “"phase change heat transfer"”.
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Enhanced phase change heat transfer through advanced fabrication techniques
Phase change heat transfer is an essential phenomenon occurring both in nature and in our daily lives. The natural abundance along high latent heat makes water the most widely used fluid for several applications. Industries involving thermoelectric power generation, filtration, desalination, and …
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Natural and engineered surfaces for enhanced phase change heat transfer
Phase change of water is a ubiquitous process that occurs throughout nature and in a wide range of engineering systems. Over the last century, many researchers have studied the effect of surface wettability on the enhancement of phase change heat transfer. Interestingly, interfacial phenomena …
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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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Biphilic surfaces for phase change heat transfer enhancement; design, fabrication and applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Surface micro/nano structuring and functionalization for phase change heat transfer enhancement
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Modeling Phase Change Heat Transfer of Liquid/vapor Systems in Free/porous Media
… solvent extraction incorporating electromagnetic heating is a relatively new concept that relies on Radio Frequency heating and solvents to replace steam in current thermal processes for the purpose of extracting bitumen from oil rich sands. The work presented here will further the understanding …
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Molecular Interfaces and Heterogeneous Bubble Nucleation From Heated Surfaces At Nanoscale
<p>Heat transfer from a solid surface to fluid occurs in numerous applications, such as boilers, refrigerators, power electronics, etc., and include various underlying phenomena of thin-film evaporation, boiling, condensation, surface wetting, and droplet evaporation. Several studies show that heat …
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Boiling on hierarchical nanoengineered surfaces
Boiling heat transfer can be enhanced by applying nanostructured surfaces. Past studies have investigated well-ordered, non-scalable structures to study the fundamental limitations of boiling. Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate …
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Multidisciplinary research in Raman spectroscopy, phase imaging and their applications in heat transfer
Recent advances in micro-to-nanoscale heat transfer have led to tremendous research interests in the high spatial resolution thermal characterization techniques. Although great improvement has been made in temperature probe, heat flux measurement and thermophysical properties characterization …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… simulations to study individual droplet heat transfer on non-wetting surfaces (90° < θ_a < 170°). Incorporation of an appropriate convective boundary condition at the liquid vapor interface reveals that the majority of heat transfer occurs at the three phase contact line, where the local …
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Liquid-vapor phase change phenomena for heat exchangers and electronics cooling
Phase change heat transfer is an attractive heat transfer process due to its superior heat transfer coefficients as compared to single phase heat transfer. Among the fluids used as refrigerants, water is of interest for its good thermodynamic properties. It is in addition widely available, …
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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 by …
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Three-phase Heat Transfer
Phase-change heat transfer involves the exchange of thermal energy when a substance transitions between different phases, such as solid to liquid (melting), liquid to vapor (boiling), or vice versa. During phase-change, energy is absorbed or released without a change in temperature. In particular, …
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Air Cooling of High-Heat-Flux Electronics Using Wettability-Engineered Vapor Chambers
… scenarios, lacks the capacity to remove high heat fluxes frequently observed in modern integrated technology (O(~1 kW/cm2)). While recent scientific exploits explore the capabilities of phase-change heat transfer or direct cooling of hotspots on chips, these improvised thermal management …
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Coupling electrolysis and surface patterning to improve onset of nucleate boiling and bubble departure in pool boiling heat transfer
… investigates the enhancement of pool boiling heat transfer through the combined effects of electrolytic activation of bubble nucleation (via the hydrogen evolution reaction, HER) and engineering gold thin-strip microstructures fabricated on silicon substrates. The central hypothesis is that …
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Exploiting Interfacial Phenomena to Expel Matter from its Substrate
… in self-cleaning, omniphobic surfaces and phase-change heat transfer. Although there is a renewed interest in the design of robust functional surfaces which can passively remove highly viscous liquids or dew, or retard ice accretion or frost formation, the physics of several dewetting …
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Droplet growth kinetics on superhydrophobic surfaces and future work on combating cryogenic surface contamination
… kinetics during dropwise condensation. Accurate heat transfer predictions during dropwise condensation depend on the growth rates of the condensing droplets. This includes both the heat transfer rate during droplet growth as well as following droplet sweeping—where large droplets sweep away other …
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The Effects of Surface Topography on Droplet Evaporation and Condensation
… important topics of interest, since these two phase-change phenomena not only occur in the cycle of global water, e.g., the formation of rain, fog, dew, and snow in nature, but also play a critical role in a variety of applications including phase-change heat transfer enhancement, surface …
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Evaporation from nanoporous membranes for high heat flux thermal management
Heat dissipation is a critical limitation in a range of electronic devices including microprocessors, solar cells, laser diodes and power amplifiers. The most demanding devices require dissipation of heat fluxes in excess of 1 kW/cm2 with heat transfer coefficients more than 30 W/cm 2K. Advanced …
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Intricate Dynamics of Droplet-Substrate Interactions Beyond Conventional Limitations
… in facilitating mass, momentum, and energy transfer between droplets and their surroundings, with applications spanning phase-change heat transfer, material transport, surface engineering, and energy optimization. While droplet dynamics have been extensively studied over the past several …
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