CLARIFICATION OF CLEAN-BED FILTRATION MODELS

Clean-bed filtration medals are frequently used to make engineering ca lculations on aquasol removal in filters. They consist of a filtration equation, derived from a mass balance around a collector, a single-co llector collision efficiency, and an empirically derived sticking coef ficient. In order to be correctly applied and referenced, the two most commonly used models, the Yao model and the Rajagopalan and Tien (RT) model, require additional clarification. The filtration equation used in the Yao model has a different form than that of an aerosol counter part due to assumptions made in choosing a reference velocity in the s ystem. The RT model, as originally published, had variables hidden wit hin constants and contained typographic errors. In this paper we ident ify the differences in the Yao and aerosol filtration model derivation s, correctly present the RT model, and compare model predictions with particle removals reported in laboratory columns.