Abstract
Several theoretical models of sound wave propagation in air-saturated porous material are studied making use of precise measurements of both physical (porosity, flow resistivity, tortuosity) and acoustical (characteristic impedance, propagation constant) parameters. The aspects covered include the use of shape factors and the adequacy of frequency-dependent dynamic viscosity functions. Experimental results on both model materials and real material are used, with special attention to the low-frequency/high-flow resistivity regime for solid frame porous materials.
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