Deposition of Aerosol Particles on Surface Composed of Different Kinds of Materials [Translated]†

Abstract

Experimental and theoretical studies of particle deposition on a surface composed of different materials (copper and polyethylene) were conducted. Deposition of charged aerosol particles was affected by a localized electrostatic field created by the contact potential difference between the metal (copper) and the dielectric material (polyethylene), and the particles charged with positive polarity deposited mainly on the polyethylene surface, which was charged with negative polarity. This fact suggests that the deposition is caused by the Coulombic force between the surface and the particles. The deposition flux was larger for smaller particles because of the larger effect of the electrostatic field. Aerosol particles with negative polarity do not deposit on the polyethylene surface because the surface charge is negative. The deposition is, however, enhanced on the neighboring copper surface. This is explained by the fact that the electrostatic field vector directs to the main stream. It is found that the agreement between calculated results and experimental data is better for the case of assuming intrusion of the electric charge into the polyethylene than for that of assuming fixed interface charge.† This report was originally printed in KAGAKU KOGAKU RONBUNSHU, 14(5), 655-662 (1988) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Chemical Engineers, Japan.