Jiang Zhengyong, Song Mengjie, Shen Jun, Zhang Long, Zhang Xuan, Lin Shenglun
Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
Micromachines (Basel). 2023 Aug 10;14(8):1580. doi: 10.3390/mi14081580.
Cooling methods for multiple heat sources with high heat flux have rarely been reported, but such situations threaten the stable operation of electronic devices. Therefore, in this paper, the use of two microchannel heat sinks is proposed, with and without grooves, labeled Type A and Type B, respectively. Experimental investigations on the flow boiling of two microchannel heat sinks connected in parallel and in series are carried out under different mass fluxes. In addition, a high-speed camera is used to observe flow patterns in the microchannels. The cold plate wall temperature (), heat transfer coefficient (), and pressure drop () are obtained with the use of two microchannel heat sinks. The flow patterns of the bubbly flow and elongated bubbles in the microchannels are observed. The results of the analysis indicated that the , , and of the two microchannel heat sinks connected in parallel were degraded, especially when using the Type A-B parallel connection. Compared to the use of a single heat sink, the maximum decrease in was 9.44 kW/(mK) for Type A heat sinks connected in parallel, which represents a decrease of 45.95%. The influence of the series connection on the , , and of the two heat sinks is obvious. The Type A-A series connection exerted the greatest positive effect on the performance of the two heat sinks, especially in the case of the postposition heat sink. The maximum increase in was 12.77 kW/(mK) for the postposition Type A heat sink, representing an increase of 72.88%. These results could provide a reference for a two-phase flow-cooling complex for multiple heat sources with high heat flux.
针对具有高热流的多个热源的冷却方法鲜有报道，但这种情况会威胁电子设备的稳定运行。因此，本文提出使用两种微通道散热器，一种有凹槽，一种无凹槽，分别标记为A型和B型。在不同质量通量下，对并联和串联的两种微通道散热器的流动沸腾进行了实验研究。此外，使用高速摄像机观察微通道内的流型。利用两种微通道散热器获得了冷板壁温、传热系数和压降。观察到微通道内气泡流和拉长气泡的流型。分析结果表明，并联的两种微通道散热器的传热系数、传热系数和压降均有所降低，尤其是采用A - B并联连接时。与使用单个散热器相比，A型散热器并联时传热系数的最大降幅为9.44kW/(m²·K)，降幅达45.95%。串联连接对两种散热器的传热系数、传热系数和压降的影响较为明显。A型 - A串联连接对两种散热器的性能产生了最大的积极影响，尤其是后置散热器的情况。后置A型散热器的传热系数最大增幅为12.77kW/(m²·K)，增幅达72.88%。这些结果可为具有高热流的多个热源的两相流冷却系统提供参考。
