FROM 3D IMAGING OF STRUCTURES TO DIFFUSIVE PROPERTIES OF ANISOTROPIC CELLULAR MATERIALS

Emmanuel Brun (1) , Jérôme Vicente (1) , Frédéric Topin (1) , Rene Occelli (1)

1 IUSTI - Institut universitaire des systèmes thermiques industriels

This paper deals with diffusive properties phenomena in metallic foams. We have developed a 3D morphological tool to extract geometrical characteristics of the media from X-ray images. The anisotropy of the geometry of each phase is observed and the relationship between microstructure and effective properties is analyzed. We emphasize on geometrical tortuosity determination and impact on con¬ductive transport tensor. The conductive heat transfers are computed on a vertex-edge network to determine directional effective conductivities by solving the energy equa¬tion on this network. We realize a systematic study carried on a wide range of different Nickel foam samples. Finally, we propose a simple model of effective diffusion prop¬erties dependence on tortuosity and porosity.

Mots clés: Metallic foams; X-Ray images; morphology; transport properties

Domaines: Traitement des images [eess.IV]; Thermique [physics.class-ph]

Emmanuel Brun, Jérôme Vicente, Frédéric Topin, Rene Occelli. FROM 3D IMAGING OF STRUCTURES TO DIFFUSIVE PROPERTIES OF ANISOTROPIC CELLULAR MATERIALS. Continuous Mondels and discrete Systems 11, Aug 2007, Paris, France. pp.121-127. ⟨hal-00199430⟩