Electrical detachment of bumpy particles and rough spherical particles charged by corona ions

Abstract

ABSTRACT Electrostatic detachment of bumpy and spherical particles with rough surfaces charged by corona ions was studied. Corona charging leads to uniformly distributed charges across the entire particle surface. The JKR adhesion model and electrostatic interactions of these particles in contact with a surface were evaluated. The electrostatic forces for particles carrying fixed charges per unit mass were evaluated. The study investigated the electric fields required to detach charged particles from rough surfaces for different charge levels, various numbers of bumps for bumpy particles, and different numbers of contact asperities for rough spherical particles. The accuracy of the model predictions for detaching charged particles from substrates with varying degrees of roughness was assessed by comparison with the experimental data, which indicated that the predicted electric detachment fields agreed with the experimental data for the selected range of parameters. The proposed model provides a helpful framework for removing bumpy particles, and rough spherical particles charged by corona ions in various applications. For 8.3 μm polystyrene charged latex particles, approximately 46% and 62% reductions in detachment electric field were found for a 10% decrease in the roughness parameter for bumpy particles and rough spheres, respectively.