Accession Number : AD0254489

Title :   WARM FOG AND CLOUD DISSIPATION

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : LIEBERMAN, ALVIN

Report Date : JAN 1961

Pagination or Media Count : 1

Abstract : Emphasis was placed on methods involving electrical charging. The amount of fog dissipation that could be expected as a result of introducing charged droplets was analyzed theoretically, the method was shown to be feasible. A laboratory study was carried out in small fog chambers, and it was found that introduction of charged scavenging droplets accelerated dissipation of laboratory fog. Evaluation of charging techniques indicated that electrostatic atomization was superior to corona charging. An electrostatic atomizer design was developed for subsequent field use. Addition of cationic surfactants to affect the electrical properties of fog was also investigated in the laboratory. However, wall effects made it impossible to draw any firm conclusions. Sampling of droplets larger than 8 microns was investigated in connection with the use of the ARF particle counter to determine fog drop-size distribution. A technique of pulling a larger volume of fog through a vertical duct and sampling isokinetically from the duct center was checked out in the laboratory and verified in the field. The following methods were tested: aircraft dispersion of carbon black, aircraft dispersion of cationic surfactants, ground dispersion of desiccant (calcium chloride) droplets, and ground dispersion of electrically charged droplets. The effects of charged droplet dispersers on the normal atmospheric electric field were measured, and a reversal of the normal field was found, with resulting gradients up to 900 v/m. (Author)

Descriptors :   *CLOUDS, *FOG, CARBON BLACK, DESICCANTS, DROPS, ELECTRICAL PROPERTIES, IONS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE