| As a main indoor pollutant, suspended particles in the air can cause certain sick syndromes and other acute or chronic health effects. Current studies mainly focused on the emission rate, physical properties and chemical characteristics of the particles emitted from different sources, the relationship between outdoor environment and indoor particle concentration, and the influence of different ventilation mode on the concentration of indoor particles in indoor environment. As far as these previous studies, there have been little reports on the mixing processes of the aerosol particles with different diameters from outdoor environment in certain rooms. This process can definitely determine the efficiency of polluting or cleaning the air inside the rooms. In this article, the study on the mixing processes of the aerosol particles from an outdoor environment to indoor environment was carried out by numerical simulation and experimental studies.A scaled two-dimensional experimental setup was built to simulate the indoor and outdoor environment. And the real-time concentration of indoor aerosol particles was measured when outdoor air was flowing into the chamber. The results show that the flow field configuration can effectively influence the dispersion time rate of the particles at certain positions. The increase in particle diameter can decrease the dispersion time rate. When the inflow air velocity is high, the difference of the particle concentration distribution between the particles with different diameters is very little. When there is no inflow gas at the inlets, the difference can reach the highest level.A simplified PGDE (particle general dynamic equations) was suggested to simulate the transport and mixing process of indoor aerosol particles. The simulation results can reasonably fit the experimental data well. The comparison between the experimental data and numerical results also shows that the setting of deposition flux can affect the numerical results influently. |
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