Dust entrainment saltation

Collection efficiency increases as the gas throughput increases. Kalen and Zenz [14] reported that collection efficiency increases with increasing gas inlet velocity to a minimum tangential velocity. This reaches the point where the dust is re-entrained or not deposited because of saltation. Koch and Licht [12] showed that saltation velocity is consistent with cyclone inlet velocities in the range of 50 to 90ft/sec. 

Much work has been carried out over the last decade concerning surface constraints on wind erosion associated with interparticle forces, inclusive of soil moisture, silt and clay, organic matter, and precipitated soluble salts. High friction velocities are required for the entrainment and transport of either very damp or aggregated particles. In the extreme case of continuous surface crusts, entrainment usually arises only through mpture from the impact of loose particles. Only a small fraction of this body of work addresses dust emission directly, while the focus has primarily been on the entrainment of sand particles and their transport via saltation. Nonetheless, since particle impact plays a key role in dust emission, such work is relevant. 

Shao, Y, Raupach, M.R., and Findlater, P.A. 1993. The effect of saltation bombardment on the entrainment of dust by wind. Journal of Geophysical Research 98(D7) 12719-12726. 

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