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| A Numerical Simulation of Sand Particle Concentration Profiles Based on the Distribution of the Initial Lift-off Velocity |
| Huang Xincheng1,2, Liu Bo1,2, Wang Xufeng1,2, Xiong Ying1,2 |
1. College of Mechanic and Electronic Engineering, Tarim University, Alar 843300, XinJiang, China;
2. Key Laboratory of Modern Agriculture Engineering, Tarim University, Alar 843300, XinJiang, China |
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Abstract The sand particle concentration profile of wind blown sand in the saltation layer results from the interaction between wind and sand particles, and precise sand particle concentration profile can help to clarify the feed-back mechanism of wind-sand interactions and interactions between sand particles. Based on a special distribution function of sand particles' initial lift-off velocity and a physical model for the sand particles that moving in the wind flow, the trajectories of sand particles that in the steady state wind-sand flow are numerically calculated by fourth order Adams-Bashforth-Moulton method, and the sand particle concentration profiles are analyzed. The results indicate that the sand particle concentration profiles are directly and closely relevant with wind velocity and sand particle diameters and are exponentially or Gamma distributed with height. Interestingly, it will increase with the increase of the sand particle diameter and decrease with the increase of the shear velocity at any particular height.
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Received: 28 May 2014
Published: 20 May 2015
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2015, Vol. 35 
