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Research Papers: Micro/Nanoscale Heat Transfer

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
e-mail: trijotharayil@gmail.com

Lazarus Godson Asirvatham

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

S. Rajesh

Department of Nanotechnology,
Karunya University,
Coimbatore 641 114, Tamil Nadu, India
e-mail: 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
e-mail: somchai.won@kmutt.ac.th

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 3, 2017; final manuscript received June 12, 2017; published online September 13, 2017. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 140(2), 022401 (Sep 13, 2017) (9 pages) Paper No: HT-17-1060; doi: 10.1115/1.4037541 History: Received February 03, 2017; Revised June 12, 2017

The effect of nanoparticle coating on the performance of a miniature loop heat pipe (mLHP) is experimentally investigated for heat inputs of 20–380 W using distilled water as the working fluid. Applications include the cooling of electronic devices such as circuit breaker in low voltage switch board and insulated gate bipolar transistor. Physical vapor deposition method is used to coat the nanoparticles on the evaporator surface for different coating thicknesses of 100 nm, 200 nm, 300 nm, 400 nm, and 500 nm, respectively. An optimum filling ratio (FR) of 30% is chosen for the analysis. Experimental findings show that the nanoparticle coating 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 100 nm, 200 nm, 300 nm, and 400 nm, respectively. Similarly, enhancements in evaporator heat transfer coefficients of 47%, 63.5%, 73.5%, and 86% are noted for the same coating thicknesses, respectively. Evaporator wall temperature decreased by 15.4 °C for 380 W with a coating thickness of 400 nm. The repeatability test ensures the repeatability of experiments and the stability of coatings in the long run.

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Figures

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Fig. 1

(a) Miniature loop heat pipe–heater assembly, (b) evaporator and CC, and (c) schematic of evaporator. (Reprinted with permission from Tharayil et al. [6]. Copyright 2016 by Elsevier).

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Fig. 2

(a) AFM images and (b) SEM images

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Fig. 3

Experimental setup. (Reprinted with permission from Tharayil et al. [6]. Copyright 2016 by Elsevier).

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Fig. 4

Thermal resistance versus heat load

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Fig. 5

Evaporator heat transfer coefficient versus heat load

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Fig. 6

Condenser heat transfer coefficient versus heat load

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Fig. 7

Temperature variation along the heat pipe at 380 W

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Fig. 8

Surface temperature versus heat load

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Fig. 9

Thermal efficiency versus heat load

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Fig. 10

Repeatability and stability of nanoparticle coating

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