On non-Fickian hyperbolic diffusion

• Autorzy: Auriault J. L. , Lewandowska J. , Royer P.
• Konferencja: Proceedings of the 14th French-Polish Colloguium "Soli and Rock Mechanics. soil Mechanics - Geomaterials" Grenoble, August 29-31, 2007
• Języki publikacji: EN

Abstrakty

EN

Fick's law expresses the proportionality of solute flux with respect to concentration gradient. Similar relations are given by Darcy's law for the fluid flow in porous media, Ohm's law for the electric flux and Fourier's law for heat transfers. When introduced in the corresponding balance equations, these flux laws yield diffusion equations of parabolic character. Different attempts have been made to obtain hyperbolic equations so as to point out propagative phenomena. This was done by adding a time derivative flux term to the flow law. In this paper, we focus on solute transport. Two possible non-Fickian diffusion cases are addressed. We firstly investigate diffusion in fluids by a mechanistic approach. Secondly, we study the macroscopic diffusion law in composite materials with large contrast of diffusion coefficient. We show that the diffusion law obtained yields hyperbolicity for drastically short characteristic times or non-propagative waves.

Słowa kluczowe

EN

Darcy’s law; hyperbolic diffusion; composite materials

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2008
• Tom: Vol. 30, nr 1-2
• Strony: 139--146
• Opis fizyczny: bibliogr. 16 poz.,

Twórcy

autor

Auriault J. L.

autor

Lewandowska J.

autor

Royer P.

• UJF, INPG, CNRS, Laboratoire Sols Solides Structures-Risques, Domaine Universitaire, BP 53, 38041 GRENOBLE Cedex, France

Bibliografia

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