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Force on the Top Layers of a Porous Medium Subjected to Surface Pressure Oscillation.

Authors
Hwang-CC; Chaiken-RF
Source
J Appl Phys 1975 Jul; 46(7):2976-2980
Link
NIOSHTIC No.
10009608
Abstract
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.
Publication Date
19750701
Document Type
OP;
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
OP 82-75
Issue of Publication
7
NIOSH Division
PRC;
Source Name
J. Appl. Phys., V. 46, No. 7, July 1975, PP. 2976-2980
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