微通道冷却非均匀热流密度芯片的流动换热特性  

Flow and heat transfer characteristics of micro-channel cooling chip at non-uniform heat flux

作　　者：申利梅[1] 季俊杰 罗凡 陈建业 谢军龙[1] 黄涛 SHEN Limei;JI Junjie;LUO Fan;CHEN Jianye;XIE Junlong;HUANG Tao(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China National Tobacco Corporation Hunan Branch,Changsha 410004,China)

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]中国烟草总公司湖南省公司,湖南长沙410004

出　　处：《中南大学学报（自然科学版）》2021年第6期1809-1816,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51806069)。

摘　　要：为研究微通道冷却非均匀热流密度芯片的流动换热特性,采用VOF方法,通过数值模拟分析局部热点对微通道内流型、温度、换热系数及压降的影响。研究结果表明:随着热流密度增大以及流速减小,整体的流型呈现出从泡状流到环状流的变化过程;而提高热点热流密度并不会显著改变微通道内的整体流型;热点热流密度提升不仅会使该处区域的温度骤升,而且其温度波动也会大幅提高,在500 W/cm2的热点热流密度下壁面温度波动高达250 K;随着整体热流密度提高,换热系数呈现先增大后减小的趋势,热点热流密度会一定程度上提高该处换热系数并导致通道后半段的换热系数有所降低。微通道内的两相压降受随流速和整体热流密度综合影响,并随两者提高而增大,而局部热点热流密度提高对微通道内的流动压降稳定性影响不大。The influence of local hot spot on the flow pattern,temperature,heat transfer coefficient and pressure drop in the microchannel was analyzed numerically by the VOF(volume of fluid)method to explore the flow and heat transfer characteristics of microchannel cooling chip at non-uniform heat flux.The results show that with the increase of heat flux and the decrease of velocity,overall flow pattern presents a process from bubble flow to annular flow,while the increase of heat flux at hot spot doesn't remarkably change the overall flow pattern in the micro-channel.The increase of heat flux at hot spot causes the temperature of this area to rise rapidly,the temperature fluctuation is greatly magnified,and the temperature of wall fluctuates as high as 250 K at the heat flux of 500 W/cm2 at hot spot.The heat transfer coefficient shows a tendency to increase firstly and then decrease.The increase of heat flux at hot spot will enhance the heat transfer coefficient and reduce the heat transfer coefficient of the latter part of the channel to a certain extent.The pressure drop in the microchannel is influenced by flow rate and overall heat flux,and the growth of heat flux at hot spot has little effect on the stability of pressure drop in micro-channel.

关 键 词：微通道 非均匀热流密度 VOF(volume offluid)方法 流动换热特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]