Numerical simulation of drop dynamics with soluble surfactant

We use a hybrid numerical method that combines the boundary integral method with an asymptotic reduction of surfactant solubility effects neighboring a drop interface in the large bulk Peclet number limit. This provides an accurate and efficient means of simulating drop dynamics with soluble surfactant. The influence of surfactant solubility on steady-state solution branches for a drop that is stretched in an axisymmetric extensional flow is presented together with the influence of various parameters, including the capillary and Biot numbers, on unsteady drop evolution and tipstreaming.