Numerical Study of Coagulation and Sedimentation of Indoor Suspended Particles

摘要

For suspended particles coming from the outdoor environment system, Brownian coagulation is the main reason that causes the sedimentation of the indoor particles. In this paper, we first gave particles a reasonable lognormal size distribution, using the moment method, and predicted the change of particle-size distribution (PSD) in the diffusion settlement process. The results showed that with the motion of fluid, diffusion and coagulation happened to the particle simultaneously, and the volume of the particles was continuously increasing, while particle concentration decreasing. In the interface between the dynamic fluid and static fluid, the diameter of the particles reached the maximum.