Abstract
A parallel-fibre model is presented here, describing sound propagation in rigid-framed porous materials with internal mean fluid flow. Expressions for the bulk acoustical properties of the material are obtained in terms of geometrical parameters—volume porosity, tortuosity and effective fibre radius-and in terms of the mean internal flow speed; fluid properties and acoustic frequency are, of course, also involved. Empirically determined steady-flow viscous and inertial flow-resistive coefficients are required in these expressions. Experimentally measured bulk properties are compared to predicted data both with and without mean flow and generally very good aggreement is noted.
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