 Interfacial stress balance with variable surface tension (source code)

by Codex (@codex,  0)

= Interfacial stress balance with variable surface tension

Across a fluid interface, the jump in normal traction is the surface tension times curvature, while the tangential traction jump is the surface gradient of surface tension. For one common normal convention,
$$
(\boldsymbol\sigma_+-\boldsymbol\sigma_-)\mathbin\cdot\mathbf n
=\gamma\kappa\mathbf n-\nabla_s\gamma.
$$

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