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 17 of 17 for “"Thin-Film Evaporation"”.
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Comprehensive modeling of thin film evaporation in micropillar wicks
… are capable of passively supplying liquid for thin film evaporation, a promising method to reliably dissipate heat in high-performance electronics. While the maximum heat flux that can be reliably sustained (the dryout heat flux) has been well-characterized for many wick configurations, key …
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Thin-film evaporation from well-defined silicon micropillar wicks for high-heat-flux thermal management
… working fluid. In particular, capillary pumped thin-film evaporation from micropillar wicks has received significant attention owing to advances in micro/nano-fabrication and the potential to dissipate high heat fluxes by increasing the evaporative area. Yet, predictive tools to design various …
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Molecular Dynamics Studies of Thin-Film Evaporation: The Effect of Graphene-Coated Silicon on Water Evaporation Behavior
… heat flux of next-generation electronic systems. Thin-film evaporation is one of the most promising solutions, because it takes advantage of the large amount of latent heat in the phase change process. It is important to understand the relationship between interfacial thermal resistance, surface …
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Design and modeling of a high flux cooling device based on thin film evaporation from thin nanoporous membranes
… design and modeling of a cooling device based on thin film evaporation from a nanoporous membrane supported on microchannels. The concept utilizes the capillary pressure generated by the small pores to drive the liquid flow and largely reduces the viscous loss due to the thinness of the membrane. …
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Experimental Study of Meniscus Thin-Film Evaporation in a Horizontal-Tube, Falling-Film Heat Exchanger, Focusing on Dynamic Contact Angle Variation of an Advancing Meniscus
Meniscus dynamics were studied with respect to thin-film evaporation, specifically focusing on a horizontal-tube, falling-film heat exchanger. Experiments were carried out investigating the effects of solution subcooling, evaporator wall superheat, and porous-layer coating on the portions of …
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Nanoengineered surfaces for advanced thermal management
… novel cooling solutions need to be developed. Thin film evaporation is a promising approach because the large latent heat associated with phase change can be utilized while the thermal resistance associated with the liquid film thickness can be minimized. However, traditional thin film …
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Micro and nanostructures for two-phase fluid and thermal transport
… a detailed finite volume numerical model for thin-film evaporation from micropillar array wick structures. The model can predict the dry-out heat flux on various micropillar structure geometries (diameter, pitch, and height) in the length scale range of 1-100 pm and capture the optimal …
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Evaporation from nanoporous membranes
… of conventional thermal management techniques. Thin film evaporation has emerged as one of the most promising thermal management solutions. High heat transfer rates can be achieved in thin films of liquids due to a small conduction resistance through the film to the evaporating interface. In …
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Optically Powered Logic Transistor
… chemical wet etching, diffusion processes, and thin film evaporation. Electrical measurements were done by using an HP4156 parameter analyzer to measure several output voltage signals at one time while an illuminating the device with laser light. The current-voltage characteristics under …
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Wetting and phase-change phenomena on micro/nanostructures for enhanced heat transfer
… surfaces have been of interest to achieve thin film evaporation with high heat fluxes. Meanwhile, superhydrophobic surfaces with dropwise condensation promises higher heat transfer coefficients than typical filmwise condensation. My thesis work aims at improving fundamental understanding as …
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Fabrication of a nanoporous membrane device for high heat flux evaporative cooling
… performance integrated circuits. The biporous evaporation device utilizes thermally-connected, mechanically-supported, high capillarity membranes that maximize thin film evaporation and high permeability liquid supply channels that allow for lower viscous pressure losses. The 600 nm thick …
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Thermal Management Using Liquid-vapor Phase Change in Nanochannels
… fundamental understanding of droplet wicking, thin-film evaporation, and their subsequent application of heat-flux removal for cooling technology is first reported. The latter part of the dissertation is related to the disjoining pressure driven flow of nanoscale liquid film and liquid-vapor …
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Molecular Interfaces and Heterogeneous Bubble Nucleation From Heated Surfaces At Nanoscale
… and include various underlying phenomena of thin-film evaporation, boiling, condensation, surface wetting, and droplet evaporation. Several studies show that heat transfer can be enhanced significantly by incorporating micro and nanoscale features onto surfaces. Phase change heat transfer …
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Multidisciplinary research in Raman spectroscopy, phase imaging and their applications in heat transfer
… and used this integrated setup to study the thin film evaporation on structured surfaces. To measure the temperature of Raman-inactive materials, we used nanoparticles as the Raman agent. We measured the temperature distribution of the optically transparent and thermally insulated silica …
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Oscillating heat pipes : study of their oscillating motion using neutron imaging and application
… was inferred that higher heat input causes more thin film evaporation, resulting in more active oscillating motion. In the OHPs in this study, the number of liquid slugs is essentially same as the number of turns whether the liquids oscillate or not. The oscillating motion was divided into three …
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Molecular Dynamics Study of Solid-Liquid Heat Transfer and Passive Liquid Flow
… can be overcome by developing nanoscale thin-film evaporation based devices, which however require a better understanding of surface interactions and liquid vapor phase change process. Evaporation based passive flow is an inspiration from the transpiration process that happens in trees. …
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Fundamentals of microlayer evaporation and its role on boiling heat transfer enhancement
… which involves a microlayer. The microlayer is a thin film present at the bubble base and varies from nano-scale to micro-scale in thickness. The dynamics of the microlayer dictates bubble growth and departure, making it of significant importance in understanding the fundamental behavior of the …