Accession Number : AD0626606

Title :   ON THE COLLISIONS OF VERY SMALL CLOUD DROPS,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Davis,M. H.

Report Date : JAN 1966

Pagination or Media Count : 13

Abstract : Conclusions: Some of the hydrodynamic force expressions used by Hocking (The collision efficiency of small drops, Quart. J. Roy. Met. Soc., 85, 44-50 (1959)) are incorrect for close droplet separations. His conclusions should therefore be regarded with suspicion. Preliminary results based on an improved Stokesian hydrodynamic theory show no evidence for the 19-micron collision efficiency cut-off. The Stokes approximation is inadequate at Reynolds numbers as small as 0.25 for nearly equal spheres. Its range of validity in the twosphere hydrodynamic problem should be investigated. (Author)

Descriptors :   (*CLOUDS, HYDRODYNAMICS), (*HYDRODYNAMICS, RAINDROPS), SPHERES, VISCOSITY, VELOCITY, DRAG

Subject Categories : Atmospheric Physics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE