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Nanoengineered surfaces for advanced thermal management

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dc.contributor.advisor Evelyn N. Wang. en_US Xiao, Rong, S.M. Massachusetts Institute of Technology en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Mechanical Engineering. en_US 2010-01-07T20:53:05Z 2010-01-07T20:53:05Z 2009 en_US 2009 en_US
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009. en_US
dc.description Includes bibliographical references (leaves 53-54). en_US
dc.description.abstract Thermal management is a critical challenge for a variety of applications including integrated circuits (ICs) and energy conversion devices. As the heat fluxes exceed 100 W/cm2, 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 evaporation schemes such as jet impingement and sprays suffer from several limitations, such as high power consumption, complex flow patterns, and localized cooling. In this thesis, micro- and nanostructured surfaces were investigated to enhance fluid and heat transport for thin film evaporation. This thesis includes studies of fluid interactions on surfaces with micro- and nanopillar arrays with diameters and spacings ranging from 500 nm to 10 [mu]m. First, liquid transport studies were performed where a propagating liquid on an array of pillars with scalloped features can separate into multiple layers of liquid films. The scallops were found to act as energy barriers that favored liquid separation into several layers. An analytical model based on surface energy was developed to explain the phenomenon and was validated by experiments on additional tailored pillar geometries. Subsequently, a semi-analytical model was developed to predict the propagation velocity based on Modified Washburn's Model to optimize propagation of the liquid. The results were validated by measurements of liquid propagation velocity on micropillar arrays with various geometries. en_US
dc.description.abstract (cont.) Finally, the heat transfer performance was investigated on microstructure pillar arrays with integrated heaters and temperature sensors. These test devices were fabricated and the behavior of the thin liquid film under varying heat fluxes was investigated, where a two-step "dry-out" behavior was observed. The thermal resistance of the thin film including the effect of the micropillars was also analyzed. This work demonstrates the potential of micro- and nanostructures to achieve high heat fluxes via thin film evaporation. en_US
dc.description.statementofresponsibility by Rong Xiao. en_US
dc.format.extent 64 leaves en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.subject Mechanical Engineering. en_US
dc.title Nanoengineered surfaces for advanced thermal management en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Mechanical Engineering. en_US
dc.identifier.oclc 463629017 en_US

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