Vapor Permeability of Porous Fiber Materials

An investigation by a bundle model of tortuous capillaries

Abstract

Equations were proposed for estimation of average tortuosity factor, radius of capillary and number of capillaries of porous fiber materials by using a bundle model of tortuous capillaries.
Average tortuosity factor, radius of capillary and number of capillaries of papers and membrane filters were estimated with proposed equations.
Furthermore, in the case of polymer-impregnated papers, an equation was proposed for estimation of vapor permeability coefficient by introducing effective number of capillaries, and observed water vapor permeability coefficients through polymer-impregnated papers were compared with estimated values.