 Order-parameter mobility (source code)

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= Order-parameter mobility
{title2=$M$}

= Mobility
{synonym}

The positive order-parameter mobility $M$ relates the diffusive transport flux to the <chemical potential> gradient: $\mathbf J=-M\nabla\mu$. Combining this law with local conservation gives the <Cahn--Hilliard equation> when $\mu$ is the <functional derivative> of a composition <free energy>.

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