A Model of Aerosol Filtration by Fibrous Filters

Abstract

An analytic model describing a fibrous filter has been developed. Helical tubes are assumed to represent the flow passages in a filter. The model can be used to predict pressure drop and particle collection efficiency due to inertial impaction and diffusion. The predictions are compared with experiments and appear to be valid for porosities between 0.70 and 0.994 and for fiber diameters greater than 5 pm. The results of the present model are shown to compare quite favorably with those of other models for collection efficiency. Finally, the adaptability of the present model to future improvements is discussed.