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Title:Enhancement of nucleate boiling heat transfer by surface modification in a cold plate evaporator
Author(s):Alexander, Gregory J.
Advisor(s):Hrnjak, Pega
Department / Program:Mechanical Science & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):R134a
surface modification
boiling
heat transfer
copper oxide
refrigerant
phase change
two-phase
structure
nanocoating
nanostructure
nano
roughness
Abstract:Electronics cooling applications have very high local heat fluxes, which allow for significant improvement of heat transfer by different methods. This thesis focuses on improving boiling heat transfer by surface modification with R134a in a microchannel cold plate evaporator. Internal copper and brass surfaces were modified with the deposition of copper oxide nanostructures with the intention of improving nucleate boiling heat transfer. The spike-like nanostructures increase the real internal surface area and thus allow for more efficient bubble nucleation. Heat transfer coefficients were calculated with both baseline and modified cold plates for varied heat and mass flux loadings to compare how effective the nanostructures are at improving heat transfer. Longevity of the coating in a working environment and any loss of effectiveness over time were explored. To better understand the differences caused by this surface modification, flow visualization was also considered.
Issue Date:2015-07-22
Type:Thesis
URI:http://hdl.handle.net/2142/88096
Rights Information:Copyright 2015 Gregory John Alexander
Date Available in IDEALS:2015-09-29
Date Deposited:August 201


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