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Simultaneous PIV and PTV measurements of wind and sand particle velocities

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Abstract

Wind-blown sand is a typical example of two-phase particle-laden flows. Owing to lack of simultaneous measured data of the wind and wind-blown sand, interactions between them have not yet been fully understood. In this study, natural sand of 100–125 μm taken from Taklimakan Desert was tested at the freestream wind speed of 8.3 m/s in an atmospheric boundary layer wind tunnel. The captured flow images containing both saltating sand and small wind tracer particles, were separated by using a digital phase mask technique. The 2-D PIV (particle imaging velocimetry) and PTV (particle tracking velocimetry) techniques were employed to extract simultaneously the wind velocity field and the velocity field of dispersed sand particles, respectively. Comparison of the mean streamwise wind velocity profile and the turbulence statistics with and without sand transportation reveal a significant influence of sand movement on the wind field, especially in the dense saltating sand layer (y/δ < 0.1). The ensemble-averaged streamwise velocity profile of sand particles was also evaluated to investigate the velocity lag between the sand and the wind. This study would be helpful in improving the understanding of interactions between the wind and the wind-blown sand.

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Acknowledgments

This work was supported by NRL (National Research Laboratory) program and the International Joint Research Program of KOSEF (F01-2004-00010079-0) and NSFC (00510279). The authors would like to acknowledge and thank the anonymous reviewers who have provided valuable comments on this work and helped to improve the submitted manuscripts.

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  1. Wei Zhang

    Present address: Department of Aerospace Engineering, Iowa State University, Ames, IA, 50014, USA

Authors and Affiliations

  1. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Kyong-buk, South Korea

    Wei Zhang & Sang Joon Lee

  2. Department of Fluid Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, 710049, Xi’an, China

    Yuan Wang

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  1. Wei Zhang
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  2. Yuan Wang
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  3. Sang Joon Lee
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Correspondence to Sang Joon Lee.

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Zhang, W., Wang, Y. & Lee, S.J. Simultaneous PIV and PTV measurements of wind and sand particle velocities. Exp Fluids 45, 241–256 (2008). https://doi.org/10.1007/s00348-008-0474-8

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  • DOI: https://doi.org/10.1007/s00348-008-0474-8

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