Dependence of Permeability and Filtration on Pore Morphology in Consolidated Particulate Media: Final Report

摘要

This work investigates the fundamental relations between the pore network structure of filters and their behavior in gaseous streams with respect to permeability and filtration characteristics. Several quantitative relations involving measurable pore parameters are developed to closely predict permeability in both the viscous and inertial flow regimes. Estimation of the permeabilities of layered or graded filters is also discussed. It is concluded that filters can be procured to specific permeabilities and filtration characteristics by specification of the density and either the mean pore size or the powder particle size used in manufacture. It is recommended that filters having pore volume fractions less than 0.2 (relative densities greater than 80%) be avoided due to the rapid decline in the relative amount of interconnected porosity at higher density levels. Filtration performance in gas streams is investigated, and it is concluded that behavior is dependent on the actual service conditions. 34 refs., 24 figs., 3 tabs. (ERA citation 13:003722)