Yu Tingfang, Guo Xing, Tang Yicun, Zhang Xuan, Wang Lizhi, Wu Tao
Department of Energy and Power Engineering, School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China.
Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Micromachines (Basel). 2023 Jul 2;14(7):1366. doi: 10.3390/mi14071366.
The microchannel heat sink has been recognized as an excellent solution in high-density heat flux devices for its high efficiency in heat removal with limited spaces; however, the most effective structure of microchannels for heat dissipation is still unknown. In this study, the fluid flow and heat transfer in high-temperature wavy microchannels with various shaped fins, including the bare wavy channel, and the wavy channel with circular, square, and diamond-shaped fins, are numerically investigated. The liquid metal-cooled characteristics of the proposed microchannels are compared with that of the smooth straight channel, with respect to the pressure drop, average Nusselt number, and overall performance factor. The results indicate that the wavy structure and fin shape have a significant effect on the heat sink performance. Heat transfer augmentation is observed in the wavy channels, especially coupled with different shaped fins; however, a large penalty of pressure drops is also found in these channels. The diamond-shaped fins yield the best heat transfer augmentation but the worst pumping performance, followed by the square-, and circular-shaped fins. When the number increases from 117 to 410, the number increases by 61.7% for the diamond fins, while the ∆ increases as much as 7.5 times.
微通道散热器因其在有限空间内高效散热的能力，已被公认为是高密度热流设备的理想解决方案；然而，最有效的微通道散热结构仍不明确。在本研究中，对具有各种形状翅片的高温波浪形微通道内的流体流动和传热进行了数值研究，这些微通道包括裸波浪形通道以及带有圆形、方形和菱形翅片的波浪形通道。将所提出的微通道的液态金属冷却特性与光滑直通道的特性在压降、平均努塞尔数和整体性能因子方面进行了比较。结果表明，波浪形结构和翅片形状对散热器性能有显著影响。在波浪形通道中观察到了传热增强现象，特别是与不同形状的翅片相结合时；然而，在这些通道中也发现了较大的压降惩罚。菱形翅片产生的传热增强效果最佳，但泵送性能最差，其次是方形翅片和圆形翅片。当数量从117增加到410时，菱形翅片的数量增加了61.7%，而∆增加了多达7.5倍。
