期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 126, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2021.105360
关键词
Microchannel heat sinks; Porous media; Variable cross-section; Optimization; Thermal performance
资金
- High-Performance Computing Research Center (HPCRC) -Amirkabir university of technology [ISIDCECOCCloud9008081700]
The study focuses on optimizing microchannel heat sink design by utilizing variable cross-section microchannels filled with porous media to improve thermal performance. Parametric optimization based on coolant passage widths and heights shows a positive impact on reducing pumping power. The results indicate that there is an optimum design for MCHS with a porous material, which can enhance conventional microchannel heat sinks performance significantly.
This study presents optimal design of microchannel heat sinks (MCHSs) by utilizing variable cross-section microchannels filled with porous media to improve the MCHS thermal performance. A parametric optimization has been carried out based on varying coolant passage widths and heights with or without a porous material, regarding two different objectives: an average heat transfer coefficient and pumping power. Results indicate that the coolant passage enlargement has a positive impact on reducing the required pumping power. Although the coolant passage's width enlargement causes a slight drop in the heat transfer coefficient, the coolant passage's height extension provides a higher heat transfer coefficient. In addition, the porous material has a significant effect on reducing pumping power; however, it causes a slight reduction in the heat transfer coefficient. The results reveal that there is an optimum design for MCHS with a porous material. Numerical optimization carried out at Reynolds numbers ranging 140-560, shows better performances at higher Reynolds numbers; however, the effectiveness of utilizing variable cross-section microchannels and porous media are less pronounced when the Reynolds number increases. Utilizing variable cross-section microchannels filled with and without porous media is found to enhance conventional microchannel heat sinks performance up to 90% and 40%, respectively.
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