Abstract
AbstractA recent paper by Starr and Mason (1966) described experimental determinations of the collection efficiencies of water drops and of simulated snow crystals for small, roughly spherical particles in the form of spores and pollen grains. Using these data and additional information obtained from observations on the impaction of particles on sticky spheres in a wind tunnel, calculations are presented for the rates at which particles of these sizes would be removed from the atmosphere by impaction on raindrops and snow crystals as a function of precipitation intensity. The raindrop scavenging results are compared with those of earlier computations by Chamberlain (1953) who used the theoretically derived values of collection efficiency by Langmuir (1948) and applied an intuitive equation suggested by Langmuir to interpolate between viscous and potential flow solutions for the collection efficiency.
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