Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 25, Issue 1, Pages 51-57Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2015.01.011
Keywords
Flexible heat pipe; Superhydrophilic; Polymer; Thermal resistance
Funding
- National Natural Science Foundation of China (NSW) [51403127, 51420105009, 91333115, 21401129]
- Natural Science Foundation of Shanghai [13ZR1421500, 14ZR1423300]
- Starting Foundation for New Teacher of Shanghai Jiao Tong University [14X100040046]
- Zhi-Yuan Endowed fund from Shanghai Jiao Tong University
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In this work we report the facile fabrication and performance evaluation of flexible heat pipes that have integrated bioinspired wick structures and flexible polyurethane polymer connector design between the copper condenser and evaporator. Inside the heat pipe, a bioinspired superhydrophilic strong-base-oxidized copper mesh with multi-scale micro/nano-structures was used as the wicking material and deionized water was selected as working fluid. Thermal resistances of the fabricated flexible heat pipes charged with different tilling ratios were measured under thermal power inputs ranging from 2 W to 12 W while the device was bent at different angles. The fabricated heat pipes with a 30% filling ratio demonstrated a low thermal resistance less than 0.01 K/W. Compared with the vertically oriented straight heat pipes, bending from 30 degrees up to 120 degrees has negligible influence on the heat-transfer performance. Furthermore, repeated heating tests indicated that the fabricated flexible heat pipes have consistent and reliable heat-transfer performance, thus would have important applications for advanced thermal management in three dimensional and flexible electronic devices. (C) 2015 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.
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