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• THERMAL CONDUCTIVITY OF METALLIC FOAM: SIMULATION ON REAL X-RAY TOMOGRAPHIED POROUS MEDIUM AND PHOTOTHERMAL EXPERIMENTS  download article

J. Vicente
IUSTI Laboratory - Polytech' Marseille, Marseille, France

Frederic Topin
Laboratoire I.U.S.T.I, Polytech' Marseille, Université de Provence, CNRS-UMR 6595 Technopôle de Château-Gombert, 5, Rue Enrico Fermi, 13453 Marseille Cedex 13, France

J.-V. Daurelle
IUSTI Laboratory - Polytech' Marseille, Marseille, France

Fabrice Rigollet
Institut Universitaire des Systèmes Thermiques Industriels, UMR CNRS 6595, Ecole Polytechnique Universitaire de Marseille (Dpt. Mécanique Energétique), Technopole de Château Gombert, 5 rue Enrico Fermi, 13453 Marseille cedex 13, France

ABSTRACT

Metallic foams are highly porous materials which present a complex structure of three-dimensional open cells. The determination of effective transport properties is essential for these widely used new materials. The thermal conductivity of metallic foams is determined with the solid phase skeleton obtained from X-ray tomography images where the energy equation is solved. A transient photo-thermal method is used to identify thermo-physical parameters of the foam. Predicted and measured conductivity values are in good agreement. Specific structure morphology measurements are performed separately. We measure directional tortuosities of the solid matrix and correlate them to the cell shape and orientation. We quantify the dependence of the conductivity with tortuosity.

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