Bidispersive poroacoustic waves

An acceleration wave analysis is presented for a fully nonlinear theory of acoustic wave propagation in a bidispersive porous medium. The bidispersive porous medium belongs to the class of recently discovered materials known as designer porous materials. It is shown that the bidispersive material offers the possibility that an acoustic wave will be slowed down by comparison to such a wave in a standard homogeneous porous body. Also we show that the bidispersive material allows for the possibility of very strong sound attenuation, perhaps of the order of O(80)O(80) compared to acoustic propagation in a classical Jordan–Darcy porous body.