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Modeling and simulation of transport processes at fluid interfaces
Technical University of Darmstadt, Germany
Besides the already rich hydrodynamics of two-phase flows, additional transport and transfer processes like heat or mass transfer, Marangoni effects as well as phase change phenomena are of utmost importance in numerous applications with fluid interfaces. In the present talk, main emphasis will be put on mass transfer processes at clean and contaminated interfaces. The talk surveys recent developments for simulating several small-scale phenomena occurring at moving, deformable fluid interfaces with applications to liquid films, droplets and gas bubbles. The underlying models are based on sharp-interface continuum physics with different levels of complexity concerning physico-chemical interface properties, where special attention is devoted to thermodynamic consistency. The numerical solution of the resulting models is built on different approaches such as the Volume of Fluid method or Arbitrary-Lagrangian-Eulerian Interface Tracking. These approaches include the accurate treatment of interfacial jump conditions, thin concentration boundary layers and the solution of interfacial PDEs accounting for surface active agents.