Velocity measurements for flows around micro-cylinder array based on image overlapping

Wang Haoli; Xu Ming

doi:10.11729/syltlx20160047

Volume 30 Issue 6

Apr. 2021

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Journal of Experiments in Fluid Mechanics > 2016 > 30(6): 59-65. > DOI: 10.11729/syltlx20160047

Wang Haoli, Xu Ming. Velocity measurements for flows around micro-cylinder array based on image overlapping[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(6): 59-65. DOI: 10.11729/syltlx20160047

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Velocity measurements for flows around micro-cylinder array based on image overlapping

Wang Haoli^{1, 2, ,},
Xu Ming²

1.
College of Electrical Engineering, Jinling Institute of Technology, Nanjing 211169, China
2.
China Jiliang University, Hangzhou 310018, China

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Received Date: March 21, 2016
Revised Date: July 24, 2016

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Abstract

Abstract

In this study, the influence of depth of correlation (DOC) on the micro-PIV measurement is analyzed. The method of image overlapping under the low particle density condition can decrease DOC and improve the velocity measurement accuracy. This method is applied to the velocity measurements on multiple fluid planes for the flow around a micro-cylinder array under eight Reynolds numbers from 0.8 to 3.6, and the spatial averaged velocities (SAVs) are calculated based on the velocities. In order to analyze the measurement accuracy, the velocities and SAVs resulting from the method of image overlapping are compared to those obtained by the method of average cross-correlation. The results indicate that of the image overlapping is a more reasonable method under the low particle density condition. The average pseudo-slip velocity decreases by 22.7% for the bottom surface and 17.2% for the top, respectively, and the average peak velocity increases by about 5.2%.

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