COAGULATION BEHAVIOR OF CHARGED SUB-MICRON PARTICLES IN ALTERNATING ELECTRIC FIELD

摘要

The theoretical study on the coagulation behavior of charged particles affected by the alternating electric field force was preformed. The coagulation equation of charged particles, which include the effects of electrostatic coagulation, electrostatic diffusion and Brownian diffusion, was numerically solved for various cases. Before solving the coagulation equation of charged particles, the collision efficiency was calculated. The equation of motion of two dimensionally moving particles was established to investigate the motion behavior of charged particles and collision efficiency in an alternating electric field. This equation includes the effect of the frequency and the total number concentration on the collision efficiency of fine particles and was numerically calculated. Using this calculation the coagulation equation was solved. As results, the collision efficiency and time-dependent particle number distribution changes under the effects of electrostatic coagulation, electrostatic diffusion and Brownian diffusion in alternating electric field were evaluated for various cases and compared with the previous theoretical studies.