Abstract
The modelling of the interactions between porous structures and saturating fluids has known new developments. D.L, Johnson has given a rigorous definition of tortuosity and has introduced a new parameter, the viscous characteristic dimension. A thermal characterictic dimension can be defined in a similar way. For the case of elastic structures, the two compressional waves must be taken into account. A matrix formulation is presented, which simplifies the modelling of stratified porous materials having an elastic structure
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