Decay of High-Concentration Aerosol in a Chamber

Abstract

High-concentration aerosol is supposed to be crucial in some air pollution events. Aerosol always decays due to such mechanisms as coagulation, gravitational settling and diffusion deposition in a chamber; so its concentration needs to be calibrated in chamber experiments, especially for high-concentration aerosol. Two methods including the wall-loss correction and the direct simulation Monte Carlo (DSMC) were used to describe decay of the aerosol concentration. The parameters of diffusion deposition were fitted by experimental data. The results by both methods were compared to the experimental results of high-concentration aerosol decay process. The results show that the wall-loss correction under the present conditions is valid when the initial total aerosol concentration is less than 10 4 cm −3 , and the DSMC results are consistent to the experimental data for concentration ranging from 10 4 cm −3 to more than 10 6 cm −3 .

Experimental Study on the Natural Deposition Characteristics of Erosols in Containment

“…In most studies, the agglomeration between particles and the effect of electrostatic interaction on the natural deposition of erosols were not considered. In other areas of research, Longbo Liu (Qiu et al, 2017) studied the effect of chamber erosol concentration on its natural settling. The results showed that when the erosol concentration was high and 10 4 /cm 3 , the agglomeration between the erosols must be considered.…”