Changes in Scavenging Rate Coefficients Due to Electric Charge on Droplets and Particles

摘要

Monte-Carlo simulations of diffusion have been incorporated in a trajectory model of scavenging of aerosol particles by charged cloud droplets. For same sign charges on particles and droplets there is both a long range Coulomb repulsion and a short range image charge attraction. For smaller particles with higher mobility the repulsion dominated the change in scavenging rate from the Brownian and phoretic values, with a reduction in collision rate coefficients. For larger particles with lower mobility the image attraction dominates the change, with an increase in collision rates. For opposite sign charges the long and short range attractions both increase the scavenging rate for all particle radii. A parameterization of some of the results has been made.