Abstract
By assuming that the averaged acoustic fluid velocity and temperature fields satisfy simple relaxational diffusion equations, a new model for sound propagation in porous media has been developed. The resulting model agrees quite well with the exact solutions for uniform circular or triangular pores, despite not being based upon any specific assumptions regarding the pore geometry. Other benefits of the new model include simpler equations (no Bessel or Kelvin functions are used) and the need for fewer parameters. Extension of the model to fractal pore surfaces will also be discussed.
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