It is highly desirable to understand the fluid flow and the heat transfer characteristics of buoyancy-induced micropump and microheat exchanger in microfluidic and thermal systems. In this study, we analytically investigate the fully developed natural convection in an open-ended vertical parallel-plate microchannel with asymmetric wall temperature distributions. Both of the velocity slip and the temperature jump conditions are considered because they have countereffects both on the volume flow rate and the heat transfer rate. Results reveal that in most of the natural convection situations, the volume flow rate at microscale is higher than that at macroscale, while the heat transfer rate is lower. It is, therefore, concluded that the temperature jump condition induced by the effects of rarefaction and fluid-wall interaction plays an important role in slip-flow natural convection.
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e-mail: ckchen@mail.ncku.edu.tw
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September 2005
This article was originally published in
Journal of Heat Transfer
Technical Briefs
Natural Convection in a Vertical Microchannel
Cha’o-Kuang Chen,
Cha’o-Kuang Chen
Department of Mechanical Engineering,
e-mail: ckchen@mail.ncku.edu.tw
National Cheng Kung University
, Tainan 701, Taiwan, Republic of China
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Huei Chu Weng
Huei Chu Weng
Department of Mechanical Engineering,
National Cheng Kung University
, Tainan 701, Taiwan, Republic of China
Search for other works by this author on:
Cha’o-Kuang Chen
Department of Mechanical Engineering,
National Cheng Kung University
, Tainan 701, Taiwan, Republic of Chinae-mail: ckchen@mail.ncku.edu.tw
Huei Chu Weng
Department of Mechanical Engineering,
National Cheng Kung University
, Tainan 701, Taiwan, Republic of ChinaJ. Heat Transfer. Sep 2005, 127(9): 1053-1056 (4 pages)
Published Online: April 20, 2005
Article history
Received:
November 24, 2003
Revised:
April 20, 2005
Citation
Chen, C., and Weng, H. C. (April 20, 2005). "Natural Convection in a Vertical Microchannel." ASME. J. Heat Transfer. September 2005; 127(9): 1053–1056. https://doi.org/10.1115/1.1999651
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