单纤维捕集过程中亚微米颗粒的布朗团聚

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Abstract In view of the Brownian aggregation law in the process of submicron particles (0.1~0.5μm) captured by single fiber, the Brownian aggregation behavior in the process of the dust particles captured by single fiber was numerically studied based on computational fluid dynamics-population balance model (CFD-PBM), and the partition method was used to solve population balance equation (PBE). The effects of residence time, inlet particle diameter, airflow temperature, and Pe number on the Brownian aggregation were considered comprehensively, and the numerical simulation and experimental results were compared. The results showed that the Brownian aggregation kernel met the requirements of numerical simulation calculation. The Brownian aggregation of dust particles run through the entire process, aggregation effective time t=L/v (dimension length along with flow field direction/face velocity). The smaller the dust particles, the stronger the intensity of the Brownian motion, the smaller the number density gap between Bin-7 and Bin-0, and the particle diameter was negatively correlated with the Brownian aggregation intensity. Brownian aggregation was affected by airflow temperature by changing flow field dynamic viscosity and aggregation coefficient, which was positively correlated with the Brownian aggregation intensity, when T=300K, d_p ≥ 0.5μm, the Brownian aggregation effect of particles can be ignored; Brownian aggregation was influenced by the change of Pe number through the change of diffusion coefficient, which was negatively correlated with the Brownian aggregation intensity.

Key words： submicron particles CFD-PBM Brownian aggregation partition method single fiber

Received: 16 August 2020

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X513

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	Articles by authors
	ZHANG Li-an
	DIAO Yong-fa
	CHU Ming-hao
	WANG Ru-ge
	SHEN Heng-gen

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ZHANG Li-an,DIAO Yong-fa,CHU Ming-hao等. Brownian aggregation in the process of submicron particles captured by single fiber[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1548-1554.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1548

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