Determination of Anisotropic Absorption and Extinction Coefficients of a Tomographed Real Porous Medium. - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2004

Determination of Anisotropic Absorption and Extinction Coefficients of a Tomographed Real Porous Medium.

Résumé

A direct identification method of the radiative properties of high porosity has been developed for wavelengths small compared to the typical structure length. The method is based on geometric properties of the media and uses numerical Monte Carlo simulations. It has been previously validated with virtual media. The method is now applied to real media and results are discussed. First, the previous Monte Carlo approach is applied to discretized medium, similar to that issued from a real medium tomography. The comparison between the results obtained directly for the virtual medium and from its discretization allows us to understand the effects of the spatial resolution and the intensity threshold used to define the fluid-solid interface. Second, this approach is applied to a real porous medium with an opaque solid phase and a transparent fluid phase. The 3D morphology of the real medium is obtained by X-ray tomography. Diffuse and specular reflection laws are considered for the solid phase. The media statistical anisotropy effects are studied.
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Dates et versions

hal-00262419 , version 1 (11-03-2008)

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Barbar Zeghondy, J. Taine, Estelle Iacona. Determination of Anisotropic Absorption and Extinction Coefficients of a Tomographed Real Porous Medium.. ASME International Mechanical Engineering Congress, 2004, Anaheim, United States. pp.IMECE2004-59711, ⟨10.1115/imece2004-59711⟩. ⟨hal-00262419⟩
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