矩形微细通道内流场的可视化实验研究  

Visualization experiments of the flow field in rectangular microchannels

作　　者：唐大伟[1] 张春平[1] 曲伟[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《华中科技大学学报（自然科学版）》2007年第11期24-27,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：中国科学院知识创新工程重要方向性项目(KGCX1-SW-12)

摘　　要：以蒸馏水为工质,水溶伊红为着色剂,对水力直径为419.2μm,相对粗糙度为3.86%的矩形不锈钢微槽内流动流态进行了可视化实验研究.经光学显微镜放大后由CCD相机拍摄,得到了不同Re数下矩形微槽内的流型图,同时测量了微槽内的摩擦阻力系数.可视化实验表明随Re数增大,出口段、中间段及入口段依次出现层流向湍流过渡,层流向湍流过渡是渐进的、连续的.摩擦阻力实验表明无论层流区还是过渡区,摩擦阻力系数均高于传统理论预测值,由于转捩提前层流区摩擦阻力系数随Re数增大,与传统理论预测值偏差越大.可视化实验与摩擦阻力实验均表明层流向湍流过渡的临界Re数在1 500左右.Taking Distilled water and eosin Y as working fluid and colorant respectively,the flow field was visualized experimentally and the transitional Reynolds number from laminar to turbulent flow in stainless steel microchannel with hydraulic diameter 419.2 μm and relative roughness 3.86 % were confirmed.The flow configuration pictures in microchannel were shot by a charge coupled device(CCD) camera with a microscope at different Reynolds numbers.The visual experiment show that as the Reynolds number increased,t...

关 键 词：流场 可视化实验 转捩 摩擦阻力系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]