Accession Number : AD0613650

Title :   THE EFFECT OF ELECTRIC CHARGES AND FIELDS ON THE COLLISIONS OF VERY SMALL CLOUD DROPS,

Corporate Author : RAND CORP SANTA MONICA CALIF

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

Report Date : APR 1965

Pagination or Media Count : 7

Abstract : The growth of cloud droplets by collision and coalescence is a basic process in the development of precipitation. The paper discusses the influence of electric charges and fields on collisions of small cloud droplets using accurate electrostatic forces (Davis, 1962, 1964) and recently improved values for hydrodynamic forces. Of primary interest are cases where collisions will occur only under the influence of electrostatic forces (Sartor, 1960). Using Hocking's hydrodynamics it was estimated that electrostatic forces began to produce collisions in droplets with radii under 15 microns when alpha exceeded 0.01 esu/ sq cm. The effect was most important when the droplets were nearly the same size.

Descriptors :   (*ELECTROSTATICS, ATMOSPHERIC CONDENSATION), (*ATMOSPHERIC CONDENSATION, ELECTROSTATICS), CLOUDS, MOISTURE, DROPS, TRAJECTORIES, HYDRODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE