Baseline Model for the Simulation of Bubbly Flows

The bubble size is a key parameter appearing in closure relations for the Euler‐Euler two‐fluid model. The bubble size distribution is established as a result of bubble coalescence and breakup processes. These processes are very complex, and therefore, a two‐step procedure is adopted for model validation where, in a first step, measured values are substituted for the bubble size distribution. In this way, the uncertainties of the less developed modeling for bubble coalescence and breakup are bypassed and a validation of the other parts of the overall model becomes possible. In a second step, the previously qualified models for bubble forces and bubble‐induced turbulence are used without any change and the validity of the models for bubble coalescence and breakup can be assessed.