Fabrication and experimental evaluation of a polymer-based flexible pulsating heat pipe

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A polymer-based flexible pulsating heat pipe (FPHP) as a flexible heat spreader was developed, and a series of experiments were conducted to evaluate the thermal performance and the long-term reliability of the FPHP. The FPHP consisted of a multilayer laminated film and a low-density polyethylene (LDPE) sheet. HFE-7000 was used as the working fluid, and the width, length, and thickness of the FPHP were 53.4 mm, 85.5 mm, and 1 mm, respectively. To minimize the permeation of non-condensable gases (NCGs) in a lateral direction, the heat-sealed flanges were covered with the indium coating. Owing to the indium-coated flanges, the long-term reliability of the FPHP drastically increased. The lifetime of the FPHP was defined to evaluate the long-term reliability. The FPHP had a lifetime of 18.2 days in the acceleration test environment, which was equivalent to 306 days in a standard atmosphere and 17 times longer than the previous polymer-based PHP. The FPHP had the thermal resistance of 2.41 K/W, which is 37% lower than that of the copper reference sample in a vertical orientation. Under bending conditions as well as in a horizontal orientation, the FPHP still operated well as a PHP, but the thermal resistance increased slightly. The fabrication method of the FPHP is effective in minimizing the permeation of NCGs in a lateral direction and can pave the way for fabricating a thin flexible heat spreader that has high flexibility, high thermal performance, and long-term reliability.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

NON-CONDENSABLE GAS; PERFORMANCE; PART; OSCILLATION; DESIGN

Citation

ENERGY CONVERSION AND MANAGEMENT, v.156, no.15, pp.358 - 364

ISSN
0196-8904
DOI
10.1016/j.enconman.2017.11.022
URI
http://hdl.handle.net/10203/238155
Appears in Collection
ME-Journal Papers(저널논문)
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