Abstract
The size of the aerosol particles that most effectively penetrate a granular bed, and the corresponding minimum collection efficiency have been predicted by considering Brownian diffusion, particle interception and gravitational sedimentation as controlling aerosol deposition mechanisms. 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. In the former case, the most penetrating particle size shifts to the larger size range as either air velocity or granule size increases. In the latter case, that size is found to shift to the smaller size range under the identical conditions. Where all these three mechanisms are operative to about equal extent, the most penetrating particle size reaches a maximum. Regardless of such shifts of the most penetrating particle size, the corresponding minimum efficiency of a granule bed filter is found to decrease with increasing air velocity or granule size. The calculated results have been compared with existing experimental data and excellent agreement has been obtained.
Published Version
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