基于微观粒子图像测速法的微肋阵通道内流场特性研究

doi:10.11949/0438-1157.20210427

摘要/Abstract

摘要：

采用微观粒子图像测速法（Micro-PIV），实验研究了Reynolds数（Re）=50～800范围内去离子水在微肋直径D=0.4 mm微肋阵内的绕流流场特性，获得了不同Re下错排和顺排微肋阵内的流线分布与速度场，分析了Re与微肋排布方式对旋涡结构、流速分布等流场特性的影响规律。研究结果表明，在Re=50～700范围内，错排和顺排微肋阵内均出现涡结构，当Re=800时错排微肋阵内开始发生旋涡脱落；错排微肋阵内旋涡长度随着Re的增大而增加，而对于顺排微肋阵，在低Re时旋涡长度随着Re的增大而增加，当Re≥300后，旋涡长度保持微肋间距不再增加；顺排微肋阵内主流区顺流速度较错排微肋阵大，而错排微肋阵内横向速度大于顺排微肋阵且最大值比顺排微肋阵高约25%，微肋错排布置增强了流体的掺混。

关键词: 微肋阵, 微观粒子图像测速法, 流场, 旋涡, 流线, 微通道, 微流体学

Abstract:

Micro particle image velocimetry (Micro-PIV) system was used to study the flow field characteristics of deionized water in micro pin fin arrays with diameter of micro pin fin D=0.4 mm in Reynolds number (Re) range of 50—800. The streamline distribution and velocity field in the staggered and in-line micro pin fin arrays were obtained at different Reynolds numbers. The effects of Re and micro pin fin arrangement on vortex structure and velocity distribution in the wake region were analyzed. The results showed that in the range of Re=50—700, the vortex structure appeared in the staggered and in-line micro pin fin arrays. When Re=800, the vortex shedding began in the staggered micro pin fin array. The vortex length in the wake region of the staggered micro pin fin array increased with the increase of Re. While for the in-line micro pin fin array, the vortex length increased with the increase of Re at low Re, and kept the value of the longitudinal micro pin fin spacing when Re≥300. The streamwise velocity in the main flow area of the in-line micro pin fin array was higher than that of the staggered micro pin fin array. While the transverse velocity in the staggered micro pin fin array was higher than that of the in-line micro pin fin array, and the maximum value was about 25% higher than that of the in-line micro pin fin array. The staggered arrangement of the micro pin fin enhanced the mixing of the fluid in the micro channel.

Key words: micro pin fin array, Micro-PIV, flow field, vortex, streamline, microchannels, microfluidics

中图分类号:

TK 124

刘志刚,董开明,吕明明,季璨,江亚柯. 基于微观粒子图像测速法的微肋阵通道内流场特性研究[J]. 化工学报, 2021, 72(10): 5094-5101.

Zhigang LIU,Kaiming DONG,Mingming LYU,Can JI,Yake JIANG. Study on characteristics of flow field in micro pin fin array based on Micro-PIV[J]. CIESC Journal, 2021, 72(10): 5094-5101.

图/表 10

图1 微肋阵内流场测试系统

Fig.1 Measurement system of the flow field in micro pin fin arrays

图2 微肋阵实验段结构图

Fig.2 Structure of the micro pin fin arrays

表1 微肋阵实验段几何参数

Table 1 Geometrical size of the micro pin fin arrays

排布方式	L/mm	W/mm	H/mm	L_inlet/mm	D/mm	S_T/mm	S_L/mm
错排	27.2	5.2	0.2	5	0.4	0.8	1.2
顺排	27.2	5.2	0.2	5	0.4	0.8	1.2

图3 微肋绕流示意图

Fig.3 Schematic of flow past a micro pin fin

图4 不同Re下错排与顺排微肋阵内时均流线图

Fig.4 Time-averaged streamline for staggered and in-line micro pin fin arrays for different Re

图5 Re=800错排微肋阵内瞬时流线图

Fig.5 Instantaneous streamline for staggered micro pin fin array at Re=800

图6 不同Re下错排与顺排微肋阵内平均无量纲旋涡长度

Fig.6 Average dimensionless length of vortex for staggered and in-line micro pin fin arrays for different Re

图7 不同Re下错排与顺排微肋阵内平均无量纲旋涡中心位置

Fig.7 Average dimensionless location of vortex center for staggered and in-line micro pin fin arrays for different Re

图8 不同Re下错排与顺排微肋阵内流体时均速度分布

Fig.8 Time-averaged velocity distribution in staggered and in-line micro pin fin arrays for different Re

图9 Re=300中间排微肋尾流区旋涡中心截面的顺流速度与横向速度分布

Fig.9 Distributions of dimensionless streamwise and transverse velocities along line through the vortex center in the wake of micro pin fin in the middle of the micro pin fin arrays at Re=300

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