Pressure-dependent permeability of unsaturated porous media produces flow by vibration

As fluids and porous media are compressible, particularly if free gases are present in the fluid and/or at the pore wall, the permeability of such med ia varies as a function of the fluid pressure. Under high fluid pressure th e permeability increases and under low pressure it decreases. Mechanical vi brations discharged into porous media make the fluid pressure vary and, thu s, cause flow by vibration which is directed out of the vibration source. W ith regard to the specific use of mechanical vibrations for soil remediatio n methods or injection techniques, for example, a Darcy equation based theo ry and the fundamental principles of such flows are presented. Hereby, the permeability included in the Darcy equation is a pressure-dependent paramet er. The stationary pressure line equation and, in the case of a sine vibrat ion, the equation of the time averaged Darcy velocity are given as a functi on of the gas content in the fluid and at the pore wall.