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Zev Levin, Morris Neiburger, and Lawrence Rodriguez

Abstract

Collection efficiencies of drops of radius A less than 120 µm falling through clouds of drop radius a for which the size ratio p=a/A was between 0.18 and 0.23 were found experimentally to be considerably lower than the corresponding theoretically computed collision efficiency. Assuming the difference to be due to failure of some of the colliding drops to coalesce, the coalescence efficiency was computed and found to decrease with increasing p, in qualitative agreement with the results of Whelpdale and List obtained for much larger collector drops.

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Morris Neiburger, Zev Levin, and Lawrence Rodriguez

Abstract

A method of measuring drop size distribution in clouds, especially adapted for wind tunnels and other cloud chambers in which the cloud is carried in an air stream, is presented. It consists of photographing the cloud illuminated both by a continuous source and a stroboscopic light. The fall velocities of the drops determined from the photographs are used with tables of terminal velocities to give the size distributions. The advantages of the method are discussed.

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