Abstract
IN an attempt to explain the distribution produced on the ground by the sedimentation of particles from an “instantaneous point source” under the influence of the wind, Davies1 assumed that the particles fell with their Stokes velocity and had no influence on the rate of fall of neighbouring particles. The complicating factors of the differing settling velocities, resulting from an extended range of particle sizes, and turbulent diffusion, from the influence of the wind, make it difficult to test this assumption under his experimental conditions. It would, however, be remarkable if particles did not affect each other when falling through air as a cluster, as they do in other fluids2.
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References
Davies, D. R., Proc. Camb. Phil. Soc., 46, 506 (1950).
Slack, G. W., Nature, 200, 466 (1963).
Ludlam, F. H., and Scorer, R. S., Quart. J. Met. Sci., 79, 317 (1953).
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SLACK, G. Sedimentation of a Large Number of Particles as a Cluster in Air. Nature 200, 1306 (1963). https://doi.org/10.1038/2001306a0
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DOI: https://doi.org/10.1038/2001306a0
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