| Contents |
| Recent results on phase field models for multi-phase flow with soluble surfactant will be presented. The diffuse interface approach is considered as an approximation to a free boundary problem. The focus lies on correctly recovering interfacial equations and conditions in the sharp interface limit, particularly with respect to the surfactant. Partial rigorous results have been obtained in the case that the motion of the interface is given. The presentation will be rounded off by some heuristics for the full system that are supported by numerical results. |
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