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- W2250267180 abstract "A theory of sound waves propagation in porous media that includes the nonlinear effects of the Forchheimer type with the nonzero radial velocity effects is laid out by using variational solutions. It is shown that the main parameters governing the propagation of sound waves are the shear wave number s = R√ρω/µ, the reduced frequency number k = wR/a, the porosity e, the Darcy number Da = R/K and the Forchheimer number Cs* = 2CF. The manner in which the flow influences the attenuation and the phase velocities of the forward and backward propagating isentropic acoustic waves is deduced. It is found that the increasing of Darcy number and Forchheimer number increased wave's attenuations and phase velocities for both forward and backward sound waves, while the increasing of porosity decreased attenuation and phase velocities. The effect of increasing reduced frequency is found to increase the attenuation of the forward waves and decrease attenuation and phase velocities of the forward and backward sound waves. The effect of the steady flow is found to decrease the attenuation and phase velocities for forward sound waves and enhance them for the backward sound waves, respectively." @default.
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- W2250267180 date "2007-12-29" @default.
- W2250267180 modified "2023-09-23" @default.
- W2250267180 title "On the isentropic Forchheimer's sound waves propagation in a cylindrical tube filled with a porous media" @default.
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