Filtration of Airborne Particulates by Gravel Filters: I. Initial Collection Efficiency of a Gravel Layer |
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Authors: | Seiichi Miyamoto Hinrich L. Bohn |
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Affiliation: | Department of Soils, Water and Engineering , The University of Arizona , Tucson , Arizona |
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Abstract: | An equation derived for initial collection of efficiency E0 of a gravel bed filter predicts that — ln(1 — E0) is proportional to the thickness of the gravel layer, to the — 5/3 power of the diameter of uniform gravels, and to the — 2/3 power of the Darcy airflow velocity. The experimental data obtained from NH4CI fume removal from dry air at room temperature by sieved gravel fractions generally supported the equation, except that the effect of mean gravel size was represented by the —1.43 power of the average diameter. |
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