SEDL / STP / STP975-EB / STP42080S

Particle Collection Mechanisms Pertinent to Granular Bed Filtration

Lee, Ken W.
Associate Manager, Environmental Physics and Chemistry Section of Battelle's Columbus Division, Columbus, Ohio

Pages: 14    Published: Jan 1986

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Abstract

Flow fields and particle collection mechanisms in the maximum penetration regime are reviewed. Simple equations are introduced for predicting the size of the aerosol particles that most effectively penetrate a granular bed, and the corresponding minimum collection efficiency. Influences of filter operating velocity and granule size are also discussed. The results show that the most penetrating particle size for a granular bed filter exists as a result of either the Brownian diffusion mechanism combined with gravitation or Brownian diffusion with the interceptional mechanism.