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Deposition from charged aerosol flows through a two-dimensional bend.
J Aerosol Sci 1980 Jan; 11(1):391-395
An analysis was presented on the deposition of a monodisperse aerosol which has a uniform electric charge per particle as the aerosol flows through a bend. The case of a two dimensional bend was considered to simplify the analysis. In a two dimensional channel, secondary flows do not occur as the paths the fluid particles would have to follow in order to reach the inside wall would be infinitely long. The velocity field used in the paper was an ideal one. The entrance effect was neglected and the velocity was assumed to vary linearly with the distance from the center of curvature of the channel. Mathematical equations for the determination of collection efficiency were presented. In order to compare the results of the analysis with experimental data obtained from a lung cast, an aerosol with 1 micrometer aerodynamic diameter and 300 electronic charges per particle flowing through a 90 degree bend of 1 centimeter width was considered. Collection efficiencies were calculated and showed that the particle charge effect was insignificant for Stokes number greater than 0.02. This was in agreement with experimental findings. At a given Stokes number, the calculated efficiency was considerably lower than the measured value because the two dimensional bend was used in the analysis. The dependence of collection efficiency on particle charge, however, showed a pattern similar to that observed by experiment.
NIOSH-Publication; NIOSH-Grant; Pulmonary-system-disorders; Aerosol-particles; Chemical-deposition; Electrical-charge; Mathematical-models
Engineering Science S U N Y - at Buffalo Dept of Engineering Science Buffalo, N Y 14214
Issue of Publication
Journal of Aerosol Science
State University of New York at Buffalo, Buffalo, New York
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division