Impact of pore density on oscillating liquid flow in metal foam

摘要: Abstract Oscillating water flow in commercial, highly-porous, open-cell aluminium foam with two common pore densities of 10 and 40 per inch (ppi) was investigated experimentally. Flow displacements 74.35, 97.20 111.53 mm were produced each foam; a sizable range frequency from 0.116 to 0.696 Hz imposed. The effect density by comparing the current study third literature having 20 ppi. comparison at same porosity approximately 88%. Results have shown that has considerable on important oscillating parameters including inlet pressure, pressure drop friction factor. For high frequencies, 20-ppi highest followed 40-ppi then 10-ppi foam. low These trends explained considering viscous form drag losses according permeabilities Forchheimer coefficients three foams. periodic for densities, while behavior not clearly discernable, indicating presence nonlinear processes multiple transitions among regimes. factor seen lie above steady 10- all as expected. However, there no difference between steady-state factors frequencies. behaviour indicated different regimes based boundary them occurring Reynolds number around 4000 foams, 5500 correlated number, correlation being generally better Friction metal compared those obtained air some other porous media literature. Various effects play, well interactions them, highlighted discussed. Major conclusions practical implications summarized.