RESEARCH IN ELECTRICAL PHENOMENA ASSOCIATED WITH AEROSOLS
Quarterly rept. no. 4, 15 Apr-15 Jul 1961
LITTLE (ARTHUR D) INC CAMBRIDGE MA
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RESULTS OF EXPERIMENTS ON THE CHARGING OF PARTICLES BY SPRAYING THEM AGAINST SOLID SURFACES ARE PRESENTED. Large differences in charging characteristics were exhibited by various liquids. The effect of charge on the vapor pressure of small particles was evaluated for maximum charging levels. At maximum charge the electrical forces on a droplet are equal and opposite to the surface tension forces the vapor pressure over a small drop is equal to that over a plane surface. This reduction in vapor pressure is important only for small drop sizes. The deposition of charged particles on small grounded objects was considered. Two geometries were analyzed to show that in spite of low average electric fields there can be a considerable intensification of the field around small grounded objects. As a result charged aerosols will be selectively deposited on these targets.
- Physical Chemistry