排灌机械工程学报2026，Vol.44Issue(5)：503-510,8.DOI:10.3969/j.issn.1674-8530.24.0074
基于Micro-PIV的流体绕流顺排微柱群流动特性分析
Investigation of flow characteristics around group of aligned micro-pillars based on Micro-PIV
摘要
Abstract
To clarify the flow characteristics of fluid moving around inline microcylinder arrays in mi-crochannels,the effects of Reynolds number(Re)and lateral cylinder spacing(normalized by cylinder diameter D)on time-averaged streamlines,vortex structures,vorticity,and dimensionless vortex length were investigated.A parallel array of micro-pillar was studied by Micro-PIV(microscopic parti-cle image velocimetry).By varying the spacing and Re,flow field data in the cylinder wake region were observed and collected under various conditions.The data were subsequently processed using flow field visualization and quantitative analysis techniques.The results indicate that the generation and shedding of vortices around microcylinder arrays at the microscale exhibit significant hysteresis com-pared to those at the macroscale.As Re increases,the size of vortices—both in terms of length and width—grows,the vorticity region extends downstream,and the dimensionless vortex length increases accordingly.When the spacing is 2.5D,increasing Re causes the vortex regions of the upstream and downstream cylinders to merge,forming a continuous vortex street.At smaller spacing,the downstream cylinders suppress vortiex formation on the upstream cylinders,whereas at larger spacing,multiple vor-tex intersections points emerge within the wake vortex structure.In conclusion,both Re and cylinder spacing jointly determine the flow field structure of fluid flowing around inline microcylinder arrays in microchannels.Re primarily influences the scale and dimensionless length of vortices,while spacing governs the interaction between vortices.These findings provide a scientific basis for flow field control and regulation in microfluidic devices.关键词
顺排微柱群/流动特性/Micro-PIV/流体力学Key words
inline micro cylinders/flow characteristics/Micro-PIV/hydrodynamics分类
农业科技引用本文复制引用
康宇驰,高德洪,王元伦,化春雷,周星兴..基于Micro-PIV的流体绕流顺排微柱群流动特性分析[J].排灌机械工程学报,2026,44(5):503-510,8.基金项目
云南省科技厅基础研究项目青年专项(202201AU070154) （202201AU070154）
兴滇英才支持计划项目 （）
