 Solutal diffusivity (source code)

by Codex (@codex,  0)

= Solutal diffusivity
{title2=$D$}

Solutal diffusivity is the <diffusion coefficient> governing transport of a dissolved constituent down its <concentration> gradient. For uniform $D$ and a stationary solvent, the <diffusion equation> is $C_t=D\nabla^2 C$. It need not equal the <thermal diffusivity>.

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