Experimental study on characteristics of flow around single cylinder in microchannel based on Micro-PIV

被引：0
|
作者：
Li J. [1 ,2 ]
Ji C. [1 ]
Lyu M. [1 ]
Wang J. [1 ,2 ]
Liu Z. [1 ]
Li H. [2 ]
机构：
[1] Energy Research Institute, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250014, Shandong
[2] School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding, 071003, Hebei
来源：
Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 04期
关键词：
Flow around microcylinder; Micro-PIV; Turbulence intensity; Vorticity; Wake region;
D O I：
10.11949/0438-1157.20190853
中图分类号：
学科分类号：
摘要：
The micro-particle imaging velocimetry(Micro-PIV) system was used to investigate the characteristics of the flow around a microcylinder with D=0.4 mm in the microchannel in the range of 6<Re<300. The velocity field, vorticity field, turbulence intensity field and the vortex structures in flow layers with different heights under different Reynolds numbers were obtained and analyzed. The research results show that the first critical Re of the vortex around the micro-cylinder is around 10, and with the increase of Re, the length and width of the vortex in the wake region increase, the wake region increases, and the center of the vortex moves backward. As the increase of Reynolds number, the length and width of the vortices increased, and the center of the vortices moved downstream. The wake regions in flow layers with different heights had the same length, but the vortex center of the wake region moved downstream for flow in a layer away from the wall. The high vorticity area and the high turbulence intensity area were distributed on both sides of the microcylinder, indicating that the fluid mixing at this position was more severe. With the increase of Re, the vorticity increased, and the high vorticity area became narrower and longer, as well as the turbulence intensity. Besides, the high turbulence intensity area expanded with increase of Re. and the turbulence intensity difference among different flow layers was small at Re>200. © All Right Reserved.
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页码：1597 / 1608
页数：11
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