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research-article

Comparative study on thermal performance of ultra-thin miniature loop heat pipes with different internal wicks

[+] Author and Article Information
Guohui Zhou

School of Engineering Science, University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, China
ghzhou1992@163.com

Ji Li

Laboratory of Advanced Thermal Management Technologies, School of Engineering Science, University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, China
jili@ucas.ac.cn

Lucang LV

School of Engineering Science, University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, China
lc2008_bj@sohu.com

G.P. Peterson

Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 225 North Avenue, Atlanta, GA 30332-0325, USA
bud.peterson@gatech.edu

1Corresponding author.

ASME doi:10.1115/1.4036982 History: Received February 05, 2017; Revised May 17, 2017

Abstract

Presented here are the results of an experimental investigation of two ultra-thin miniature loop heat pipes (mLHPs) with different internal wicking structures: one with a primary wicking structure in the evaporator and a secondary wicking structure in the liquid line and the other only with the same primary wicking structure in the evaporator, but no secondary wick. The systematic experimental investigation was conducted using natural convection as the cooling mechanism in order to study the heat transfer performance of the two mLHPs and fully examine the effects of the secondary wick. The results indicated that both of the test articles could effectively dissipate 12 W at all test orientations with a minimum total thermal resistances of 6.38 oC/W and 6.39 oC/W, respectively. However, the results indicated that the presence of the secondary wicking structure in the liquid line at low power loads, resulted in more stable startup characteristics and a weaker dependence on the different orientations. Moreover, it was demonstrated that the steady-state evaporator temperatures of the test article with the secondary wicking structure in the liquid line were much lower than those observed for a 1 mm thick copper plate with the same geometric dimensions for all heat loads in the horizontal orientation, showing a higher thermal performance.

Copyright (c) 2017 by ASME
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