Drag difference between steady and shocked gas flows passing through a porous body |
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Authors: | K Kitagawa T Jyonouchi M Yasuhara |
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Institution: | (1) Department of Mechanical Engineering, Aichi Institute of Technology, 1247 Yachigusa, Yagusa-Cho, Toyota, Aichi 470-0392, Japan , JP;(2) Faculty of Environmental and Information Science, Yokkaichi University, 1200 Kayou-Cho, Yokkaichi, Mie 512-8512, Japan , JP |
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Abstract: | Experimental and numerical investigations of gas flows through porous materials have been carried out. We have investigated
steady and unsteady processes occurring when the gas flow interacts with porous materials. Densities and porosities of the four open-cell-type polyurethane foams which were investigated are kg/m and , with the foams having different structures. Experiments were conducted to determine the steady drag coefficient of the porous
material at low Reynolds numbers, evaluated from the pressure drop. The Forchheimer equation was applied to determine the
drag. Values of permeability coefficients () in the Forchheimer equation were estimated by comparing computed and experimental results. Results show that the drag coefficient
is largely affected by the internal structure of the foam, and has almost no effect on the stress history, while the value of dominates the stress history variation. Differences of 1000 times exist between the steady flow and unsteady shock tube flow
values.
Received 15 May 1998/ Accepted 15 March 1999 |
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Keywords: | : Shock-foam interaction Two-phase flow resistance Numerical analysis |
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