In order to design packed columns for multiphase operation it is necessary to include reliable data on the flow behavior in the model. Since experiments inside packings are very difficult to perform, CFD simulations are considered to be a sensible approach as numerical experiments. To obtain reliable results validation is inevitable. We present the validation of two-and three-phase film flow under transient conditions. This application is not abundant in literature. Numerical results are compared to data from own experiments. A statement is given on the usability of a VOF-like code for such applications.

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