Technical Briefs

Hydrophobic Surface Effect on Heat Transfer Performance in an Oscillating Heat Pipe

[+] Author and Article Information
Yulong Ji

Marine Engineering College, Dalian Maritime University, Dalian, Liaoning Province, China; Department of Mechanical and Aerospace Engineering,  University of Missouri, Columbia, MO 65211

Hsiu-hung Chen, Young Jo Kim, Qingsong Yu

Department of Mechanical and Aerospace Engineering,  University of Missouri, Columbia, MO 65211

Xuehu Ma

Department of Chemical Engineering,  Dalian University of Technology, Dalian, Liaoning Province, China 116026

H. B. Ma1

Department of Mechanical and Aerospace Engineering,  University of Missouri, Columbia, MO 65211mah@missouri.edu


Corresponding author.

J. Heat Transfer 134(7), 074502 (May 22, 2012) (4 pages) doi:10.1115/1.4006111 History: Received June 08, 2011; Revised December 24, 2011; Published May 22, 2012; Online May 22, 2012

An experimental investigation of an oscillating heat pipe (OHP) with a superhydrophobic inner surface coated with a superhydrophobic self-assembled monolayer (SAM) of n-octadecyl mercaptan was conducted. The experimental results show that the oscillating motion in an OHP with a superhydrophobic surface can be generated and the OHP can function well. This is very different from the conventional wicked heat pipe, which cannot function if the inner surface is hydrophobic. The functionality of a superhydrophobic OHP is not sensitive to the wetting condition of the inner surface of the OHP. The investigation results in a better understating of heat transfer mechanism occurring in an OHP.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 4

Power input effect on thermal resistance

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Figure 3

Temperature oscillations of evaporator, adiabatic section and condenser in an OHP (Power input: (a) 25 W; (b) 50 W; (c) 75 W; (d) 100 W; (e) 150 W; and (f) 200 W)

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Figure 2

Contact angle measurements of a liquid drop on (a) an inner surface of copper tube and (b) a flat copper plate

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Figure 1

Schematic of experimental system (Units in mm)



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