Wave propagation and mechanism of aided flow by vibration in granular flow field

The flowing granular media was regarded as weak transverse isotropic media, and the phase velocity expression of P wave, SH wave and SV wave were deduced. The propagation specialities of waves in flowing granular media were analyzed. The wavefront of P wave is elliptic or approximately elliptic, the wavefront of SH wave is elliptic, and the wavefront of SV is not elliptic. In terms of specialties of wave propagation it can be deduced that vibrating waves have less influence on fluidity of granules when the amplitude and frequency are small. However, when the amplitude and frequency increase gradually, the eccentricity of ellipsoid, the viscosity resistance and inner friction among granules and shear intensity of granules decrease, as well as the loosening coefficient of granules increase, so that the granules have better fluidity. The results of experiment have proved the conclusion and analysis.