M. V. Carneiro, N. A. M. Araújo, T. Pähtz, H. J. Herrmann
Here we address the old question in Aeolian particle transport about the importance of mid-air collisions. We find that surprisingly these collisions do enhance the overall flux substantially. The effect depends strongly on restitution coefficient and wind speed. We can explain this observation as a consequence of a "soft bed" of grains which floats above the surface and reflects the highest flying particles. We make the unexpected observation that the flux is maximized for an intermediate restitution coefficient of about 0.65, which is comparable to the values experimentally measured for collisions between sand grains.
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http://arxiv.org/abs/1212.4603
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