单圆柱微通道内流动特性实验研究

doi:10.3976/j.issn.1002-4026.2020.04.008

Abstract

Abstract: In this paper, a micro-PIV system and differential pressure measurement system is used to study the flow characteristics of deionized water in a channel with a single microcylinder in the range of 10 < Re < 430. The streamlines, dimensionless velocity field, turbulence intensity distribution of different flow layers, and pressure drop are obtained. Results show that the first and second critical Reynolds numbers of the flow around the microcylinder are approximately 10 and 430, respectively. The fluid in the wake vortex has a velocity component that is perpendicular to the flow direction, and the three-dimensional characteristics of the vortex are obvious. When Re is low, the pressure drop and the length of vortices increase slowly with Re and the viscous resistance accounts for a larger proportion. With increase in Re, the vortex gradually develops simultaneously with the increase in the proportion of shape resistance, and the pressure drop increases faster with Re. When Re = 400, the slope of the pressure drop curve rises and then gradually transforms into vortex shedding.

Key words: flow around a microcylinder, micro-PIV, critical Reynolds number, vortex, turbulence intensity

CLC Number:

TK124

LI Ji-Chao, JI Can, LIU Zhi-gang, LI Hui-jun, MA Chao, CHI Wen-tao. Experimental study on flow characteristics in a microchannel with a single cylinder[J].Shandong Science, 2020, 33(4): 53-62.

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Experimental study on flow characteristics in a microchannel with a single cylinder

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