Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2021-11-28 , DOI: 10.1016/j.csite.2021.101677 Juncheng Qiu 1 , Jianhong Zhou 1 , Qi Zhao 1 , Hanshi Qin 2 , Xuemei Chen 1
In recent years, researchers have conducted extensive studies on the improvement of heat transfer performance of microchannels, however, exploiting biomimetic microchannels to enhance the flow boiling heat transfer performance is still relatively rare. In this study, inspired by the cobweb structures in nature, cobweb-shaped microchannels with horizontal inlet and outlet (CMHS-H) and cobweb-shaped microchannels with inclined inlet and outlet (CMHS-I) are proposed. Flow boiling simulations were carried out with the inlet temperature of 300 K at the bottom heat flux of 75–125 W/cm2 under different mass fluxes by utilizing volume of fluid (VOF) model. The flow boiling characteristics of the CMHS-I and CMHS-H were studied and compared with those of the rectangular microchannel heat sink (RMHS). The result demonstrated that both the CMHS-H and CMHS-I can enhance the heat transfer coefficient and reduce the wall temperature due to the flow disturbance and increased heat transfer area; whereas the CMHS-H is effective to reduce the pressure drop and suppress the flow instability at high mass flux. At high heat flux, the CMHS-H shows the best heat transfer performance and the most stable flow boiling behavior. This study provides a promising approach of using biomimetic microchannels to dissipate high heat flux associated with advanced electronics.
中文翻译:
蛛网状微通道散热器流动沸腾特性的数值研究
近年来,研究人员对微通道传热性能的提高进行了广泛的研究,但利用仿生微通道来提高流动沸腾传热性能的还比较少见。在这项研究中,受自然界蛛网结构的启发,提出了具有水平进出口的蛛网状微通道(CMHS-H)和具有倾斜入口和出口的蛛网状微通道(CMHS-I)。在底部热通量为 75-125 W/cm 2 的条件下,以 300 K 的入口温度进行流动沸腾模拟利用流体体积 (VOF) 模型在不同质量通量下。研究了 CMHS-I 和 CMHS-H 的流动沸腾特性,并与矩形微通道散热器 (RMHS) 的流动沸腾特性进行了比较。结果表明,CMHS-H和CMHS-I都可以提高传热系数,降低壁温,因为流动扰动和传热面积增加;而 CMHS-H 可有效降低压降并抑制高质量流量下的流动不稳定性。在高热通量下,CMHS-H 表现出最佳的传热性能和最稳定的流动沸腾行为。这项研究提供了一种有前途的方法,即使用仿生微通道来消散与先进电子设备相关的高热通量。