摘要
微肋阵结构为解决微电子设备超温问题开辟了新方向。建立了纵间距分别为800μm、1200μm、1600μm,截面形状为方形和圆形的错排微肋阵模型。在50≤Re≤600的条件下,计算分析了不同纵间距及截面形状对错排微肋阵内流动特性的影响。研究结果表明:纵间距越小,微肋阵内边界层流动分离现象出现越晚;方形微肋阵流动分离现象早于圆形微肋阵;纵间距越小的微肋阵壁面处,双子涡不对称现象越明显;微肋阵内压差与流速成正比,与纵间距成反比;非光滑结构的微肋能显著增大微肋阵内压降,纵间距为800μm的方形微肋阵内压差比纵间距为800μm的圆形微肋阵内压差大25%;从扰动增强促进流体混合的角度来看,纵间距为800μm的方形错排微肋阵为最优。
The micro pin-fin structure opens up a new direction for solving the over-temperature problem of microelectronic equipment.In this paper,staggered micro pin-fins models with longitudinal spacing of 800μm,1200μm,and 1600μm,and cross-sectional shape of square and circular were established.Under the condition of 50≤Re≤600,the influence of different longitudinal spacing and cross-sectional shape on the flow characteristics in the staggered micro pin-fins were calculated and analyzed.The research results showed that:the smaller the longitudinal spacing is,the later the boundary layer separation occurs;the flow separation phenomenon of the square micro pin-fins were earlier than that of circular micro pin-fins;the asymmetry of a pair of vortices at the wall of micro pin-fin with smaller longitudinal spacing is more obvious;the pressure difference in the micro pin-fins is directly proportional to the flow velocity and inversely proportional to the longitudinal spacing;non-smooth structure of micro pin-fin can significantly increase the pressure drop in the micro pin-fins;the pressure difference of the staggered square micro pin-fin with a longitudinal spacing of 800μm is 25%greater than that in the staggered circular micro pin-fin with a longitudinal spacing of 800μm;f From the perspective of disturbance enhancement promoting fluid mixing,the square staggered micro pin-fin with a longitudinal spacing of 800μm is the best.
作者
李慧君
匙文涛
李东
王业库
LI Huijun;CHI Wentao;LI Dong;WANG Yeku(School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电力科学与工程》
2021年第9期71-78,共8页
Electric Power Science and Engineering
关键词
微肋阵
纵间距
截面形状
漩涡
压降
micro pin-fin
longitudinal spacing
cross-sectional shape
vortex
pressure drop
