Viscous Drag and Filtration Efficiency of Bimodal Fibrous Materials

The viscous drag of bimodal fibrous materials and the efficiency of gas filtration through them have been studied as depending on the volume fraction of thin fibers. The dependence of the Brinkman constant on the content of fibers with a lower diameter has been calculated for the equations describing the hydrodynamics of a gas in a porous medium composed of fibers having two different diameters. The penetration of aerosol particles has been calculated as depending on their diameter for different bimodal filters. The calculated and experimental data have been compared.