The fluid-mechanical force acting on the top layers of porous dust beds is analyzed and a new interpretation made when the beds constitute the walls in turbulent gas streams. The nonlinear differential equation governing the pressure distribution in the medium is solved numerically. When a sinusoidal pressure oscillation is applied at the surface of a porous medium, direct calculations show that there may occur a net upward force, for a duration within one cycle, on the top layers of the medium. By using the present results, a possible mode for the initiation of erosion of an erodible granular bed in a turbulent gas stream is examined. This mechanism may have significance in connection with dust explosions and soil erosion.
Issue of Publication
J. Appl. Phys., V. 46, No. 7, July 1975, PP. 2976-2980
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