横断扰流与肋槽组合微通道热沉传热特性研究  

Heat Transfer Characteristics of Heat Sinks in Cross-section Turbulent Flow and Ribbed Groove Combined Microchannel

作　　者：程翔煜 寇志海 CHENG Xiangyu;KOU Zhihai

机构地区：[1]沈阳航空航天大学国际工程师学院,沈阳110136 [2]沈阳航空航天大学航空发动机学院,沈阳110136

出　　处：《科技创新与应用》2025年第5期7-12,共6页Technology Innovation and Application

基　　金：国家自然科学基金(51406124);辽宁省教育厅科研项目(LJKMZ20220528)。

摘　　要：对传统微通道热沉进行改良,采用横断扰流的布局形式,分段翅片长度从入口端到出口端逐步缩短,并在翅片迎流端和射流冲击区域布置平滑过渡结构以减小压降,在翅片四等分点处布置奇对称肋柱凹槽组合结构,在横断区布置水滴形肋柱,并将新型热沉和传统热沉进行对比。对比结果表明,在研究的雷诺数范围内,新型热沉底面平均温度T_(ave)降低幅度约为17~26 K,对流换热系数h提高幅度约为120%~122%,努塞尔数Nu提高幅度约为141%~143%,热阻R降低幅度约为58%~59%。通过对水滴形肋柱取不同攻角对新型热沉进行优化,对比结果表明,热沉综合性能评价因子PEC大致呈现攻角15°>0°>30°的现象。Improvements were made to the traditional microchannel heat sink by adopting a transverse turbulent flow layout.The length of segmented fins gradually shortens from the inlet end to the outlet end.Arrange smooth transition structures at the upstream end of the fins and the jet impact area to reduce pressure drop.A combination structure of odd symmetric rib column grooves was arranged at the four equal points of the fins,and water droplet shaped ribs were arranged in the transverse section.And compare the new heat sink with the traditional heat sink.The comparison results show that within the range of Reynolds numbers studied,the average temperature T_(ave) of the new heat sink bottom decreases by about 17~26 K,the convective heat transfer coefficient h increases by about 120%~122%,the Nusselt number Nu increases by about 141%~143%,and the thermal resistance R decreases by about 58%~59%.Through optimizing the new heat sink by taking different angles of attack on the water droplet shaped rib column,the comparison results show that the comprehensive performance evaluation factor PEC of the heat sink generally exhibits a phenomenon of attack angles of 15°>0°>30°.

关 键 词：横断扰流 水滴形肋柱 射流冲击 攻角 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]