A probability density function of liftoff velocities in mixed-size wind sand flux |
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Authors: | XiaoJing Zheng Wei Zhu Li Xie |
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Institution: | (1) Key Laboratory of Mechanics on the Western Disaster and Environment, Ministry of Education, Lanzhou University, Lanzhou, 730000, China |
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Abstract: | With the discrete element method (DEM), employing the diameter distribution of natural sands sampled from the Tengger Desert,
a mixed-size sand bed was produced and the particle-bed collision was simulated in the mixed-size wind sand movement. In the
simulation, the shear wind velocity, particle diameter, incident velocity and incident angle of the impact sand particle were
given the same values as the experimental results. After the particle-bed collision, we collected all the initial velocities
of rising sand particles, including the liftoff angular velocities, liftoff linear velocities and their horizontal and vertical
components. By the statistical analysis on the velocity sample for each velocity component, its probability density functions
were obtained, and they are the functions of the shear wind velocity. The liftoff velocities and their horizontal and vertical
components are distributed as an exponential density function, while the angular velocities are distributed as a normal density
function.
Supported by the Key Project of the National Natural Science Foundation of China (Grant No. 10532040) |
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Keywords: | wind sand flux mixed-size particle diameter liftoff velocity probability density function (PDF) discrete element method (DEM) |
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