Heat Transfer Characteristics of a Microchannel Heat Sink with Highly-Dense Micro-Jet Arrays  

作　　者：ZHANG Yu CHEN Xiaoyan MIAO Lin CHEN Liang HOU Yu 

机构地区：[1]State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China [2]Beijing Aerospace Technology Institute,Beijing,100083,China

出　　处：《Journal of Thermal Science》2024年第3期1148-1160,共13页热科学学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(52176020);the Youth Innovation Team of Shaanxi Universities。

摘　　要：This paper proposed a new structure of highly-dense micro-jet arrays for hybrid jet-impingement/microchannel heat sinks(~120 jet per cm^(2) with jet width of 0.35 mm).Parametric study is performed to investigate the influence of structure and flow parameters on the convective heat transfer of water jet cooling in confined space.The simulation results show that the optimal jet width,jet spacing and impingement distance are around 0.2 mm,0.2 mm and 0.3 mm,respectively,which can achieve a low thermal resistance as well as a relatively low pressure drop.The analysis of the heat transfer pathways shows that the micro-fin jet structures can extend the impinging heat transfer area and conduct a considerable proportion of heat,which can reach up to 38.9%with the Reynolds number ranging from 797.1 to 5602.2.The heat transfer characteristics in the heat sink will shift from impingement dominated heat transfer to the channel-convection dominated heat transfer as the jet impingement distance increases.A correlation is proposed to predict the average Nusselt number on the stagnation area for the heat sink with different structure parameters,and the deviations of predictions from the numerical results are less than 10%.

关 键 词：hybrid heat sink IMPINGEMENT MICROCHANNEL thermal management high heat flux 

分 类 号：TK124[动力工程及工程热物理—工程热物理]