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Thermal performance of ultra-thin flattened heat pipes

Zhou, Wenjie; Xie, Peida; Li, Yong; Yan, Yuying; Li, Bo

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Authors

Wenjie Zhou

Peida Xie

Yong Li

YUYING YAN YUYING.YAN@NOTTINGHAM.AC.UK
Professor of Thermofluids Engineering

Bo Li



Abstract

This study investigates the thermal performance of composite ultra-thin heat pipes (UTHPs). UTHPs are fabricated by flattening cylindrical heat pipes with outer diameter of 2 mm. The thickness and width were 0.8 mm and 2.7 mm, respectively. The composite wick structure is made of sintered copper foam-mesh wick (CFMW). CFMW combines the good heat transfer performance of copper foam and the high mechanical strength of mesh. The manufacturing process of UTHP was studied and the thermal performance of UTHP samples were investigated experimentally. The results indicate that the optimum filling ratio of UTHPs is 100% and the maximum temperature difference is 3.7 °C under the maximum heat transport capacity of 5 W. The thermal resistances of UTHPs increase gradually with the heat power before drying out. Too low or too high filling ratios will reduce the heat transfer efficiency of UTHPs by increasing the thermal resistances. With the optimum filling ratio of 100%, the evaporation thermal resistance of UTHP is found to be 0.29 K/W and the condensation thermal resistance is 0.45 K/W at the heat load of 5 W.

Journal Article Type Article
Acceptance Date Jan 25, 2017
Online Publication Date Jan 27, 2017
Publication Date May 5, 2017
Deposit Date Feb 28, 2017
Publicly Available Date Jan 28, 2018
Journal Applied Thermal Engineering
Print ISSN 1359-4311
Electronic ISSN 1873-5606
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 117
Pages 773-781
DOI https://doi.org/10.1016/j.applthermaleng.2017.01.089
Keywords Ultra-thin heat pipe; Composite wick; Filling ratio; Thermal performance
Public URL https://nottingham-repository.worktribe.com/output/859539
Publisher URL http://www.sciencedirect.com/science/article/pii/S1359431117305446

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