Measurement of wall-shear stress via micro-particle tracking velocimetry

XU Dechen; ZHANG Yue; LIU Xinle; LI Wenfeng

doi:10.11729/syltlx20210156

Volume 36 Issue 2

May 2022

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2022 > 36(2): 131-138

XU D C，ZHANG Y，LIU X L，et al. Measurement of wall-shear stress via micro-particle tracking velocimetry[J]. Journal of Experiments in Fluid Mechanics, 2022，36（2）：131-138. doi: 10.11729/syltlx20210156

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Measurement of wall-shear stress via micro-particle tracking velocimetry

doi: 10.11729/syltlx20210156

School of Aeronautics, Northwestern Polytechnical University, Xi’an　710072, China

Received Date: 2021-10-15
Accepted Date: 2022-03-04
Rev Recd Date: 2022-02-14

Available Online: 2022-05-26

Publish Date: 2022-05-19

Abstract

Abstract

Micro-Particle Tracking Velocimetry （µ-PTV） was used to measure the flow field near the wall with high spatial resolution. By analyzing the velocity distribution of the viscous sublayer, the wall-shear stress can be analyzed by one-time linear regression. The wall-shear stress of the turbulent boundary layer at different Reynolds numbers based on momentum loss thickness was measured and the flow structure of reversal flow events was obtained at Re_θ=1200. The results show that the micro-particle tracking velocimetry technology can accurately measure the wall-shear stress and the measurement error of wall-shear stress is below 2% for Re_θ=1634–4070. Furthermore, the probability of reversal flow is extreme low, i.e., about 0.05% at Re_θ=1200. The measured spatial scale of reversal flow structures is around 8×30 wall units, and therefore the measurement of reversal flow events requires high spatial resolution of the measurement technology. The results show that the reversal flow events occur with the appearance of strong spanwise vortices near the wall.es near the wall.
- Micro-Particle Tracking Velocimetry,
- wall-shear stress,
- turbulent boundary layer,
- reversal flow events

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References(32)

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