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 16 of 16 for “"Latent heat of vaporization"”.
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Influence of forced convection on sessile droplet evaporation
… process with potential for achieving large heat transfer rates under high air temperatures due to the latent heat of vaporization. Bioin-spired artificial perspiration systems can leverage the evaporation of sessile droplets to implement this effect for different cooling applications. In the …
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Pool and flow boiling of novel heat transfer fluids from nanostructured surfaces
Steadily increasing heat dissipation in electronic devices has generated renewed interest in direct immersion cooling. The ideal heat transfer fluid for direct immersion cooling applications should be chemically and thermally stable, and compatible with the electronic components. These constraints …
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Assessing the effects of ethanol addition on particulate matter emissions in GDI engines
Previous research on the effects of ethanol addition on particulate matter (PM) emissions in GDI engines show diverse results. In this thesis, an overview on three major aspects, PM formation, effects of engine operating conditions, and ethanol effects, unveils the large number of factors that can …
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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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Design of a microbreather for two-phase microchannel devices
… in microchannels are encountered in a variety of microfluidic applications. Two-phase microchannel heat sinks leverage the latent heat of vaporization to offer an efficient method of dissipating large heat fluxes in a compact device. In microscale methanol-based fuel cells, the chemical …
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Enhanced Heat Transfer Performance by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar
<p>Abstract</p> <p>Enhanced Heat Transfer Performance by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar</p> <p>By</p> <p>Haotian Wu</p> <p>Department of Mechanical Engineering and Materials Science</p> <p>Washington University in St. Louis, 2019</p> <p>Research …
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Modeling and Control of the Paper Machine Drying Section
The topic of this thesis is modeling and control of the last part of the paper machine - the drying section. Paper is dried by letting it pass through a series of steam heated cylinders and the evaporation is thus powered by the latent heat of vaporization of the steam. The moisture in the paper is …
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Development of an air-cooled, loop-type heat pipe with multiple condensers
… to high performance computing systems. Heat pipes are capillary-pumped devices that take advantage of the latent heat of vaporization of a working fluid to achieve low thermal resistance (~0.1 °C/W), and have been of particular interest to address these thermal management needs for …
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Analysis of an oscillating engine for power generation based on the "Drinking Bird Toy"
"The investigation presented here is of an oscillating engine of which the "Drinking Bird Toy" is a prime example. A model is set up to represent the way the toy works and an attempt is made to calculate the power output for a hypothetical large scale engine working on the same principle. This …
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A study on the emissions of butanol using a spark ignition engine and their reduction using electrostatically assisted injection
Butanol is a potential alternative to ethanol and offers many benefits including a much higher heating value and lower latent heat of vaporization. It also has a higher cetane number than ethanol and improved miscibility in diesel fuel. Additionally, butanol is less corrosive and less prone to …
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Thin-film evaporation from well-defined silicon micropillar wicks for high-heat-flux thermal management
The generation of concentrated heat loads in advanced microprocessors, power amplifiers, and concentrated photovoltaics present significant thermal management challenge for defense, space and commercial applications. Liquid to vapor phase-change strategies are promising due to the high latent heat …
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Mechanistic Understanding and Enhancing Pool Boiling Heat Transfer via Surface Property and Structure Design
Boiling is a vital process used to transfer heat effectively via harnessing the large latent heat of vaporization for a variety of energy and thermal management applications. The boiling heat transfer performance is described mainly by critical heat flux (CHF) and heat transfer coefficient (HTC), …
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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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Influence of Water/Hydrocarbons Co-Condensation on Top of the Line Corrosion
<p>Top of the line corrosion (TLC) is a significant concern in wet gas transportation, where temperature gradients between internal pipeline and outside environments lead to the condensation of water vapor and a certain fraction of hydrocarbons. Liquid water from condensation is greatly corrosive …
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Potentials for COP increase in vapor compression systems
… presents an experimental and numerical study of three different opportunities for COP increase in vapor compression systems: work recovery ejectors, condenser subcooling and increase of relative size of heat exchangers (HXs). Regarding work recovery ejectors, experimental results showed that …
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Physical properties, evaporation and combustion characteristics of nanofluid-type fuels
<p>Nanofluids are liquids with stable suspension of nanoparticles. Limited studies in the past have shown that both energetic and catalytic nanoparticles once mixed with traditional liquid fuels can be advantageous in combustion applications, e.g., increased energy density and shortened ignition …