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research-article

Effect of nanoparticle coating on the performance of a miniature loop heat pipe for electronics cooling applications

[+] Author and Article Information
Trijo Tharayil

Department of Mechanical Engineering, Karunya University, Coimbatore-641 114, Tamil Nadu, India
trijotharayil@gmail.com

Dr. Godson Asirvatham

Department of Mechanical Engineering, Karunya University, Coimbatore-641 114, Tamil Nadu, India
godson@karunya.edu
godasir@yahoo.co.in

S Rajesh

Department of Nanotechnology, Karunya University, Coimbatore-641 114, Tamil Nadu, India
drsrajesh@karunya.edu

Somchai Wongwises

Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand
somchai.won@kmutt.ac.th

1Corresponding author.

ASME doi:10.1115/1.4037541 History: Received February 03, 2017; Revised June 12, 2017

Abstract

Effect of nanoparticle coating on the performance of a miniature loop heat pipe is experimentally investigated for heat inputs of 20-380W using distilled water as the working fluid for cooling of electronic devices such as circuit breaker in low voltage switch board and insulated gate bipolar transistor. Physical vapour deposition method is used to coat the nanoparticles on the evaporator surface for different coating thicknesses of 100nm, 200nm, 300nm, and 400nm respectively. An optimum filling ratio of 30% is chosen for the analysis. Experimental findings show that coating of nanoparticle gives a remarkable improvement in heat transfer of the heat pipe. An average reduction of 6.7%, 11.9%, 17.2% and 22.6% in thermal resistance is observed with coating thicknesses of 100nm, 200nm, 300nm and 400nm respectively. Similarly, enhancements in evaporator heat transfer coefficients of 47%, 63.5%, 73.5% and 86% respectively are noted for the same coating thicknesses. Evaporator wall temperature decreased by 15.4oC for 380W with a coating thickness of 400nm. The repeatability test ensures the stability of coatings in the long run and repeatability of experiments.

Copyright (c) 2017 by ASME
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