Particle collection efficiency of an inertial impactor with porous metal substrates

Cheng Hsiung Huang, Chuen-Tinn Tsai*, Tung Sheng Shih

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


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 φ=(ρU0/2Kμt)(Dc/W)0.9 has been introduced to determine the excess particle collection efficiency, ηe, by the porous metal substrate in the limit of St→0. The theory explains the experimental data of the excess collection efficiency very well.

Original languageEnglish
Pages (from-to)1035-1044
Number of pages10
JournalJournal of Aerosol Science
Issue number9
StatePublished - 1 Jan 2001


  • Collection efficiency
  • Inertial impactors
  • Porous metal substrate

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