Deng Daxiang, Pi Guang, Zhang Weixun, Wang Peng, Fu Ting
Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China.
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China.
Entropy (Basel). 2018 Dec 25;21(1):16. doi: 10.3390/e21010016.
This work numerically studies the thermal and hydraulic performance of double-layered microchannel heat sinks (DL-MCHS) for their application in the cooling of high heat flux microelectronic devices. The superiority of double-layered microchannel heat sinks was assessed by a comparison with a single-layered microchannel heat sink (SL-MCHS) with the same triangular microchannels. Five DL-MCHSs with different cross-sectional shapes-triangular, rectangular, trapezoidal, circular and reentrant Ω-shaped-were explored and compared. The results showed that DL-MCHS decreased wall temperatures and thermal resistance considerably, induced much more uniform wall temperature distribution, and reduced the pressure drop and pumping power in comparison with SL-MCHS. The DL-MCHS with trapezoidal microchannels performed the worst with regard to thermal resistance, pressure drop, and pumping power. The DL-MCHS with rectangular microchannels produced the best overall thermal performance and seemed to be the optimum when thermal performance was the prime concern. Nevertheless, the DL-MCHS with reentrant Ω-shaped microchannels should be selected when pumping power consumption was the most important consideration.
本工作对双层微通道散热器（DL-MCHS）在高热流密度微电子器件冷却应用中的热性能和水力性能进行了数值研究。通过与具有相同三角形微通道的单层微通道散热器（SL-MCHS）进行比较，评估了双层微通道散热器的优势。研究并比较了五种具有不同横截面形状（三角形、矩形、梯形、圆形和凹入式Ω形）的双层微通道散热器。结果表明，与单层微通道散热器相比，双层微通道散热器显著降低了壁面温度和热阻，使壁面温度分布更加均匀，并降低了压降和泵浦功率。具有梯形微通道的双层微通道散热器在热阻、压降和泵浦功率方面表现最差。具有矩形微通道的双层微通道散热器总体热性能最佳，当热性能是首要考虑因素时似乎是最优选择。然而，当泵浦功耗是最重要的考虑因素时，应选择具有凹入式Ω形微通道的双层微通道散热器。
