CFD simulations of bubble columns have received recently much attention and several multiphase models have been developed, tested, and validated through comparison with experimental data. In this work, we propose a model for two-phase flows at high phase ractions. The inter-phase forces (drag, lift and virtual mass) with different closure terms are used and coupled with a classes method (CM) for population balance. This in order to predict bubble’s size distribution in the column which results of break-up and coalescence of bubbles. Since these mechanisms result greatly of turbulence, a dispersed k-epsilon turbulent model is used.
The results are compared to experimental data available from the literature using a mean bubble diameter approach and CM approach and the appropriate formulations for inter-phase forces in order to predict the flow are highlighted.
The above models are implemented using the open source package OpenFoam.
- Population balance equation,
- coalescence and break-up,
- interfacial area,
- methods of classes,
- Bubble size,
- computational fluid dynamics (CFD)
Available at: http://works.bepress.com/rachid_bannari/2/