微通道内单柱绕流特性的实验研究  

Experimental Study on Flow Around a Single Pin Fin in a Microchannel

作　　者：季璨 吕明明 黄继凯 段炼 刘志刚 JI Can;LV Ming-Ming;HUANG Ji-Kai;DUAN Lian;LIU Zhi-Gang(Energy Research Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院能源研究所,济南250014

出　　处：《工程热物理学报》2021年第7期1844-1850,共7页Journal of Engineering Thermophysics

基　　金：山东省科学院青年基金(No.2019QN0021;No.2019QN0019);山东省科学院科技发展基金(科基合字2019第2号);山东省重点研发计划(No.2019GSF109074,No.2019GSF109019)。

摘　　要：基于显微粒子成像测速(Micro-PIV)技术,对微通道内单柱绕流特性展开实验研究,分析了10<Re<350范围内不同高度流层的速度场、涡量场及旋涡特性。结果表明:微尺度绕流现象相比宏观尺度存在滞后,首次出现旋涡的第一临界Re约为10。随着Re的增大,尾流区长度不断增加,旋涡尺度逐渐增大,旋涡中心位置向下游延伸。涡量强度随Re的增加而提高,涡量向下游扩散能力增强,高涡量区变窄。不同高度流层的速度场与涡量场存在差别,体现出三维效应。The flow characteristics past a single pin fin embedded in a microchannel is experimentally studied using Microparticle Image Velocimetry(Micro-PIV).The velocity field,vorticity field and vortex features at different channel heights at Reynolds numbers of 10~350 are analyzed.The results show that flow past cylinders at the micro scale lags behind that at the conventional scale.The first critical Reynolds number at which vortices start to appear is around 10.With the increase of Reynolds number,the length of the recirculation zone grows,the extent of the vortices enlarges,and the location of the vortex center moves downstream.The vorticity intensifies as Reynolds number increases.The ability of vorticity to diffuse downstream becomes stronger and the high vorticity region narrows.Differences in velocity and vorticity fields exist between various heights,indicating three-dimensionalities of the wake flow.

关 键 词：微尺度 绕流 MICRO-PIV 速度场 涡量场 

分 类 号：TK121[动力工程及工程热物理—工程热物理]