Abstract
To improve our understanding on the aerodynamic wall shear fluctuation in particle-laden flow, we perform statistical and spectral analyses of aerodynamic wall shear fluctuation in sand-free and sand-laden flows in a turbulent boundary layer based on the results of a wind tunnel experiment. An increase in the skewness of the probability density function of aerodynamic wall shear fluctuation is found in the sand-laden flow. The turbulent intensity of aerodynamic wall shear stress increases rapidly with the sand mass flux. The decreased convective velocity indicates blocking effects of sand particles in the near-wall region. The power of aerodynamic wall shear fluctuation in the sand-laden flow increases at low frequencies corresponding to the duration of sand streamers. The results of a superstatistical analysis of skin friction velocity show that spatio-temporal fluctuation in the local energy dissipation rate is enhanced in the sand-laden flow. Finally, the local and spatio-drifting force acting on the stochastic system of wall shear fluctuation in sand-laden flow are different, providing a proof for the significant variation in flow condition caused by sand streamers near the wall
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Data Availability Statement
This manuscript has associated data in a data repository. [Authors’ comment: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.]
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Acknowledgements
This work was supported by the State Key Program of National Natural Science Foundation of China (41931179), the National Key Research and Development Program (2016YFC0500901), and the National Natural Foundation of China (11702163).
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NH and WH conceived the works of this paper. WH designed the experiment and collected the data. WH and JZ analyzed the results. All the authors participated in the experiment. All the authors were involved in the preparation of the manuscript. All the authors have read and approved the final manuscript.
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He, W., Huang, N. & Zhang, J. Aerodynamic wall shear fluctuation in sand-laden flow in a turbulent boundary layer. Eur. Phys. J. E 44, 38 (2021). https://doi.org/10.1140/epje/s10189-021-00029-6
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DOI: https://doi.org/10.1140/epje/s10189-021-00029-6