期刊
MICROMACHINES
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/mi11040403
关键词
microchannel heat exchanger; reentrant cavity; heat transfer performance; pressure drop
类别
资金
- National Natural Science Foundation of China [51906008, 51822602]
- Fundamental Research Funds for the Central Universities [YWF-19-BJ-J-293]
- National Science and Technology Major Project [2017-III-0003-0027]
The application of microchannel heat exchangers is of great significance in industrial fields due to their advantages of miniaturized scale, large surface-area-to-volume ratio, and high heat transfer rate. In this study, microchannel heat exchangers with and without fan-shaped reentrant cavities were designed and manufactured, and experiments were conducted to investigate the flow and heat-transfer characteristics. The impact rising from the radius of reentrant cavities, as well as the Reynolds number on the heat transfer and the pressure drop, is also analyzed. The results indicate that, compared with straight microchannels, microchannels with reentrant cavities could enhance the heat transfer and, more importantly, reduce the pressure drop at the same time. For the ranges of parameters studied, increasing the radius of reentrant cavities could augment the effect of pressure-drop reduction, while the corresponding variation of heat transfer is complicated. It is considered that adding reentrant cavities in microchannel heat exchangers is an ideal approach to improve performance.
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