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.
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