| 国家重点基础研究发展规划 |
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| A Study on the Drag Coefficient of Sand Particles in Wind Sand Flux |
| CAO Xi-yong, XIE Li |
| Key Laboratory of Ministry of Education for Mechanics on Western Disaster and Environment; School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China |
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Abstract Drag coefficient is an important parameter for calculating the air resistance acting on sand particles in the wind sand flux. In this paper, taking sand concentration and sand shape in the actual situation into account, the drag coefficients of two sand particles that are at different heights from the surface are calculated using FLUENT software. Influence of wind velocity and interval between sand particles on the drag coefficient is discussed. Then the drag coefficients at different heights have been calculated in actual wind sand flux. The result indicates that at a certain wind velocity, with the increase of height from the surface, the drag coefficient first decreases and then increases. Lastly, a formula of drag coefficient is fitted, which is a function of height and relates to wind velocity.
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Received: 01 December 2010
Published: 20 May 2011
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2011, Vol. 31 
