Langevin Dynamics Calculation of Brownian Coagulation Coefficient for Spherical Equal-size Aerosol Particles in Transient Regime

Coagulation coefficient of aerosol particles due to Brownian motion is an important issue describe change in particle size distribution. Motion diffusive continuous region (small Knudsen number; Kn ), or like free molecular gaseous (large ). Fuchs (1964) presented expression coagulation transition regime by a so-called “Flux Matching” method. In his method, transportation inside the “limiting sphere” assumed be molecular, outside sphere. These days, some researchers direct calculation particles. They employed Langevin dynamics equation represent stochastic this study, we developed new model calculate coefficient. Our spherical space which one scavenging center it: sphere moves together with particle. The can calculated from mean time between collisions and concentration collision By using above numerical model, have 4 nm 100 diameter.