Font Size: 

Dust collectors are mainly used to monitor the deposition of aerosols in the atmospheric environment. The American Society for Testing and Materials (ASTM) collector, the simplified United States Geological Survey (SUSGS) collector, and the inverted frisbee collector are three commonly used collection devices. However, there have been few studies on the collection efficiency of these devices and the factors affecting their collection efficiency. In this study, we used Euler-Lagrange two-phase flow simulation to simulate the settling process of three devices under several wind speeds, and calculated the particles deposited inside the collector finally. We then simulated the effect of flow deflectors on collection efficiency and discussed the sensitivity of collection efficiency to the shape parameters of flow deflectors. The results showed that when the wind speed was low, all three dust collectors had high collection efficiency. However, collection efficiency decreased rapidly with increasing wind speed. Additionally, there was a strong correlation between collection efficiency and the aspect ratio of the collector (the ratio of the internal depth to the internal diameter of the collector). With the addition of flow deflectors, the collection efficiency of the three devices at high wind speeds was significantly improved, and the inverted frisbee collector exhibited the best collection performance. The collection efficiency of the collector was positively correlated with the area of the flow deflector, but the optimal size of the flow deflector needs to be determined in consideration of its production cost and portability.

Numerical simulation, atmospheric dust deposition, dust collection device, particle collection efficiency, deflector ring