期刊
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
卷 15, 期 1, 页码 1176-1190出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/19942060.2021.1953608
关键词
Microchannel; discrete heat sources; sinusoidal-wall; entropy generation; vortex
资金
- Natural Science Research Project of Guangdong University of Petrochemical Technology [519019]
- National Natural Science Foundation of China [21961160741]
- Fund of Laboratory Management Committee of Guangdong Higher Education Association [GDJ 2019054]
- Guangdong Science and technology projects [2021A0505060010]
- TU Dresden
The study investigated the effects of using graphene nanoplatelets/water inside a sinusoidal microchannel on heat transfer and pressure drop, finding that installing heating sources in regions with high-temperature gradients has a more significant positive impact on heat exchange. The best layout (B) showed a 37.5% increase in heat exchange compared to the base layout (A), but the pressure drop and entropy generation increased by 79% and 35.2%, respectively. By introducing a new figure of merit (FOM), layout B was found to be in the desirable zone.
The idea of using the compact device with higher heat transfer potential has encouraged researchers to use microchannels. Creating sinusoidal walls is a technique leading to better effectiveness and smaller size. In this study, the effects of discrete heat sources location on heat transfer and pressure drop are investigated, using graphene nanoplatelets/water inside a sinusoidal microchannel. For this, discrete heat sources are installed in a smooth microchannel (layout A) and compared with two sinusoidal-wall microchannels. In layouts B and C, the heating sources are installed above the convergent/diverging sections, respectively. Since the velocity and temperature gradients are higher in the converging region, the heat exchange and pressure drop for layout B are greater than other ones. In other words, installing heating sources in these regions with high-temperature gradient has a more obvious positive efficacy on heat exchange. For the best layout (B), although the heat exchange compared to the base layout (A) is 37.5% higher, the pressure drop and entropy generation are higher by 79% and 35.2%, respectively. By introducing a new figure of merit (FOM), it is found that layout B is in the desirable zone.
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