The problem of sound propagation in rigid porous media is investigated. Two so-called scaling functions are introduced to describe the dynamic viscous and thermal interaction of the pore fluid and the porous structure. These scaling functions are characterized by the viscous and thermal permeabilities k{sub}0 and k'{sub}0, the viscous and thermal tortuosities α{sub}∞, α{sub}0, and α'{sub}0, and the characteristic length scales Λ andΛ'. These parameters can be numerically evaluated from steady-state descriptions. For a pore geometry consisting of an arrangement of cylinders, the characteristic parameters are presented. The full microscopic dynamic flow and heat problems for this configuration were solved, averaged, and compared with the scaling functions. We found that for this configuration the scaling functions gave an accurate description of the oscillatory flow and heat phenomena.
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