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Modeling and Analyses of Boiling and Capillary Limitations for Micro Channel Wick Structures

Published online by Cambridge University Press:  11 December 2015

S.-W. Chen ,
F.-C. Liu ,
T.-Y. Wang ,
W.-K. Lin ,
J.-R. Wang ,
H.-T. Lin ,
J.-D. Lee ,
J.-J. Peir  and
C.-K. Shih
S.-W. Chen*
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan Department of Engineering and System ScienceNational Tsing Hua UniversityHsinchu, Taiwan
F.-C. Liu
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan
T.-Y. Wang
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan
W.-K. Lin
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan Department of Engineering and System ScienceNational Tsing Hua UniversityHsinchu, Taiwan
J.-R. Wang
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan
H.-T. Lin
Affiliation:
Institute of Nuclear Energy ResearchTaoyuan, Taiwan
J.-D. Lee
Affiliation:
Nuclear Science and Technology Development CenterNational Tsing Hua UniversityHsinchu, Taiwan
J.-J. Peir
Affiliation:
Nuclear Science and Technology Development CenterNational Tsing Hua UniversityHsinchu, Taiwan
C.-K. Shih
Affiliation:
Institute of Nuclear Engineering and ScienceNational Tsing Hua UniversityHsinchu, Taiwan
*
*Corresponding author (chensw@mx.nthu.edu.tw)
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Abstract

In order to analyze the boiling and capillary limitations of two-phase heat transport devices, the existing models developed by Chi and Peterson and the existing experimental data carried out with various micro channel wick structures from literature were collected for benchmark. It was found that the dominant parameters for boiling and capillary limitations were the nucleation sites and structure geometries of the micro channels, and important parameters were considered to modify the models empirically. It was also found that for micro channel structures the inclined angle is sensitive to the capillary limitations and not to boiling limitations. By properly estimating the nucleation sites and empirical coefficients for micro channels needed by the newly modified models, the boiling and capillary limitations can be accurately predicted, and hence the applicability of the modified models is confirmed. Based on this, a numerical analysis was then carried out to investigate the trends of boiling and capillary limitations of the micro channel wick structures. Effects of the channel geometries and arrangement were taken into account, including the aspect ratio and structure size of the micro channels. Furthermore, the effects of inclined angle and contact angle were also analyzed. The present results can provide a design reference of performance trends of micro channel wick structures.

Keywords

Micro channelsHeat spreaderCapillary limitBoiling limit
Type
Research Article
Information
Journal of Mechanics , Volume 32 , Issue 3 , June 2016 , pp. 357 - 368
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2016 

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