Numerical Investigation of the Diffusion Feature of Aerosol

Abstract

High concentration aerosol solid particle affect human health seriously. The transportation and diffusion processes of mid-air aerosol are vital to the understanding of the formation and evolution of fog-haze. Based on the mesoscale large-eddy simulation model ARPS and introducing atmosphere turbulence, the diffusion process of aerosol under different conditions is investigated. The results indicate that pollution diffusion in calm atmosphere is a rather slow process, while convection can push the pollution towards downwind effectively. Turbulence can affect the diffusion process profoundly and enhance the diffusion velocity largely. In the process of wet scavenging of aerosol particles, atmosphere turbulence increases the treating limits effectively but decreases the local efficiency to a certain extent.