Turbulent two phase drag modeling. Analysis and development

This paper presents a development of a new drag model which accounts for the wake effects generated by the relative motions between bubbles and liquid in turbulent flows. This model considers the wake effect in bubbly flow based on the Tomiyama model. The proposed model is also validated against the experimental data and shows a good performance in a wide range of Reynolds numbers and volume fractions. Subsequently, a bubbly flow in a vertical pipe is simulated with CFD code where the new model is applied. The simulation results give good prediction of the velocity profile of gas and liquid phases. It is confirmed that this model can be adopted in the two fluid model to give a good prediction of two phase bubbly flows. (orig.)