A universal correlation of friction characteristic was developed based on the measured pressure drop of air through foam matrixes. The pressure drops of seven types of aluminum foams with different porosities and pore densities were measured. The Reynolds number based on the equivalent spherical diameter of the foam ranged from 32.05 to 1289.32. The range of porosity was 0.87∼0.958. A universal empirical equation was developed to correlate the dimensionless pressure drop with the dimensionless flow velocity for all seven types of aluminum foams. The empirical correlation agreed well with experimental data. According to the empirical correlation and the measured data, the pressure drop introduced by foam matrixes was found to be much lower than that by granular matrixes at the same Reynolds number. The relationship between the friction factor and Re of foam matrixes is found to follow the trend of granular matrixes and can be classified into four regimes: Darcy-flow, inertial-flow, unsteady laminar-flow, and unsteady- and chaotic-flow regimes.

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