Transport equation for the concentration gradient

Abstract eng:
The organization and dynamic of the concentration in the heterogeneous porous media are key physical factors driving the chemical reactivity. At equilibrium, the chemical reactivity depends not only on the concentration distribution but also on concentration gradients for a simple precipitation. We derive the transport equation for concentration gradient and set up an adapted diffusion velocity method to approximate them numerically. The numerical results give optimal predictions of the chemical reactivity.

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