Abstract
Correlations for the efficiency of removal of dust from a gas by Brownian diffusion, inertial deposition, gravitational settling, and direct interception in a fixed bed of spherical granular collector particles are applied to predicting the performance of a packed bed filter. The results clarify the difference between filtration of sub-micron particles and particles larger than 1 mu m. Filter efficiency is shown to be dependent on operating temperature, with pressure exerting a much weaker effect.