Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Bubble coalescence and breakup is an important phenomenon in gas-liquid mixtures. The application of existing models is limited and they are usually not transferable from one case to another. The objective of the work is to develop a generally applicable new model for bubble coalescence and breakup. Based on an extensive literature study, a basis model is proposed which encompasses all important mechanisms. The model is implemented into the Test Solver and CFX code and applied to a case of air-water flow in a vertical pipe. The comparison with the experimental data from TOPFLOW facility shows substantial difference between the results given by Test Solver and CFX. Test Solver with the new model can provide a much better agreement than CFX. This might be caused by the turbulence modeling. The influence of two-phase turbulence parameters will be investigated in future work.