The influence of pressure diffusion effects on absorbing properties of porous media with double porosity

摘要

This paper is devoted to the study of plane waves propagation in double porosity media. Firstly, the definition of double porosity medium is recalled. Then the general description obtained in the case of strong permeability contrast, by way of an homogenisation method considering periodic separated scales media, is exposed. In this case of particular interest, a partial coupling between the networks of pores may occurred and the macroscopic description can be significantly modified by pressure diffusion effects. Models for macroscopic permeability and compressibility for infinite rigid frame materials are proposed and compared to experimental results in the case of perforated porous panels. We finally demonstrate the interest of such complex porous materials in order to build efficient wide range absoring materials.