標題: Particle collection efficiency of an inertial impactor with porous metal substrates
作者: Huang, CH
Tsai, CJ
Shih, TS
環境工程研究所
Institute of Environmental Engineering
關鍵字: collection efficiency;porous metal substrate;inertial impactors
公開日期: 1-Sep-2001
摘要: This study has investigated numerically the particle collection efficiency of an impactor with porous metal substrates. Two-dimensional flow field in the inertial impactor was simulated by solving the Navier-Stokes equations with the control volume method. Particle trajectories were then calculated to obtain the collection efficiency at different Reynolds numbers, which are based on nozzle diameter, and at different K, which is the resistance factor of the porous metal substrate. This study shows that some air may penetrate into the porous metal substrate resulting in different particle collection efficiency than that predicted by the traditional theory. The particle collection efficiency for the impactor with the porous metal substrate is higher than that with the flat plate substrate below the cutpoint, and numerical results are in good agreement with the experimental data. The dimensionless parameter phi = (rhoU(0)/2K mut)(D-c/W)(0.9) has been introduced to determine the excess particle collection efficiency, eta (e), by the porous metal substrate in the limit of root St --> infinity. The theory explains the experimental data of the excess collection efficiency very well. (C) 2001 Elsevier Science Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/S0021-8502(01)00038-6
http://hdl.handle.net/11536/29441
ISSN: 0021-8502
DOI: 10.1016/S0021-8502(01)00038-6
期刊: JOURNAL OF AEROSOL SCIENCE
Volume: 32
Issue: 9
起始頁: 1035
結束頁: 1044
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