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Thermal Performance of Cooling Enhancement of Miniature Flat Plate Heat Pipe Under Different Angle

Published online by Cambridge University Press:  08 September 2015

J.-S. Chen  and
J.-H. Chou
J.-S. Chen*
Affiliation:
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan
J.-H. Chou
Affiliation:
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan
*
* Corresponding author ([email protected])
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Abstract

The possibility of cooling enhancement of flat plate heat pipes (FPHPs) by tilting was examined experimentally in this study. All of the FPHPs were made of Al and were partially filled with acetone. They had the same size of 120 mm (length) by 36 mm (width) by 2.5 mm (thickness) and the same liquid filling ratio of 25.1%. The effects of six tilting angles of -30°, -15°, -10°, 0°, 45°, and 90° were explored. The results showed that the thermal resistance decreased and the effective thermal conductivity increased when the tilting angle was increased. By increasing the tilting angle from 0° to 45° and further to 90°, the maximum effective thermal conductivity increased by a factor of 1.205 from 4561 W/mK to 5497 W/mK and of 1.212 to 5530 W/mK, respectively. The corresponding maximum heat transport capability increased by a factor of 2.89 from 39.8 W to 115 W and of 3.27 to 130 W. Hence, by proper tilting into positve angles, cooling enhancement of the FPHPs can be greatly achieved.

Keywords

Flat plate heat pipeThermal resistanceMaximum heat transport capabilityTilting
Type
Research Article
Information
Journal of Mechanics , Volume 32 , Issue 1 , February 2016 , pp. 93 - 100
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2016 

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