Numerical and experimental study of virtual impactor design and aerosol separation

doi:10.1016/j.jaerosci.2015.12.001

Chia Nan University of Pharmacy & Science Institutional Repository > 環境永續暨休閒學院 > 職業安全衛生系(含防災所) > 期刊論文 > Item 310902800/30978

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標題:	Numerical and experimental study of virtual impactor design and aerosol separation
作者:	Chen, Hung-Ying Huang, Hsiao-Lin
貢獻者:	Department of Occupational Safety and Health, Chia Nan University of Pharmacy and Science
關鍵字:	Computational fluid dynamics Impactor Sheath flow Particles Air sampling
日期:	2016-04
上傳時間:	2018-01-18 11:39:06 (UTC+8)
出版者:	Elsevier Sci Ltd
摘要:	PM10 and PM2.5 are the most harmful particles affecting the human respiratory system in the environment or at the workplace. In this study, an innovative active virtual impactor (AVI) was developed to separate particles. The operation parameters of different flow rates regarding sample flow velocity, side flow velocity, and sheath flow velocity were established based on computational fluid dynamics (CFD) simulation results. Simulation results were also examined experimentally for validation purposes. The optimal numbers of structured grids for numerical simulations were between 10,000 and 150,000. The flow ratios of sheath velocity versus sample flow velocity were in the range from 0 to 20. The simulated particle size and side flow velocities ranged from 1.5 to 20 um and 0 to 3 m/s, respectively. In the experiment, single-sized (1.5 mu m) particles were generated and measured using a fluidized bed aerosol generator and an aerosol spectrometer, respectively. The ratio of the sheath flow velocity to the sample flow velocity can only range from 0 to 4. Simulation results showed that particles were increasingly separated when the side flow velocity increased. When the ratio of the sheath flow velocity to the sample flow velocity increased, the required side flow velocity to separate the specific particle size also increased. The experimental results agreed with simulation results. The sheath flow design could maintain the particle flow in the middle of the flow channel, and without loss on the walls of virtual impactor. The CFD simulation tool can be successfully applied to predict the particle separation efficiency of the impactor and related operational parameters. The designed AVI can thus improve the traditional virtual impactors with respect to the ease of flow control and separation efficiency. (C) 2015 Elsevier Ltd. All rights reserved.
關聯:	Journal of Aerosol Science, v.94, pp.43-55
顯示於類別:	[職業安全衛生系(含防災所)] 期刊論文

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