New answers tagged diffusion
7
It's easy to derive that equation from Fick's law. You have this diffusion equation as:
$$\frac{\partial C}{\partial t} = D \nabla^{2} C$$
The mean square displacement weighted by the concentration profile is defined as:
$$\langle r^{2}(t) \rangle = \int_{\Omega} |\vec{r}|^{2} C(\vec{r},t) d^{3} \vec{r}$$
The time-evolution of this mean square ...
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