期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 65, 期 -, 页码 52-57出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2015.04.005
关键词
Microchannel heat sink; Porous fin, Slip velocity; Pressure drop; Thermal resistance
资金
- National Natural Science Foundation of China [51276060]
- 111 Project [B12034]
- Program for New Century Excellent Talents in University [NCET-11-0635]
- Fundamental Research Funds for the Central Universities [13ZX13]
In this work, we propose a new design concept of microchannel heat sink, in which solid fins are replaced by porous fins, to reduce the pressure drop across the heat sink. The Forchheimer-Brinkman-Darcy model is used to investigate the effectiveness of this design. The results show that the pressure drop of the new design is reduced by 43.0% to 47.9% at various coolant flow rates as compared with that of the conventional heat sink, with only about 5% increase in the thermal resistance. The pressure drop reduction is attributed to slip of coolant on the channel wall due to the presence of porous fins. The drag reduction efficiency for the new design is also calculated by the slip theory extensively used in ultrahydrophobic surfaces, and the calculated value is very close to our simulation value. The results also show that the drag reduction efficiency strongly depends on the porous fin parameters. A larger slip velocity of coolant occurs at a higher permeability, a smaller quadratic drag factor, or a larger width ratio of fin-to-pitch, which corresponds to a larger slip length. As a result, the pressure drop becomes lower at these conditions. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据