Effect of gravity on particle collection efficiency of inertial impactors

Cheng Hsiung Huang, Chuen-Tinn Tsai

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


This study has investigated the effect of gravitational force on particle collection efficiency in inertial impactors numerically and experimentally. In the numerical study, 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. This study shows that gravitational force increases the particle collection efficiency when the Reynolds number is below about 1500. The numerical results were found to be in good agreement with the experimental data of Marple et al. (JAPCA,37, 1303) (1987), Rubow et al. ((1987)AmericanIndustrialHygieneAssociationJournal,48, 532) and those obtained in the present study.

Original languageEnglish
Pages (from-to)375-387
Number of pages13
JournalJournal of Aerosol Science
Issue number3
StatePublished - 1 Jan 2001


  • Cascade impactors
  • Collection efficiency
  • Inertial impactors

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