Abstract
The flow field and void fraction distribution in an aerated tank of 0.45 m diameter with a three-impeller agitator have been numerically simulated and validated against prior experimental data. An asymmetric deep hollow-blade disk turbine (BT-6) was used as bottom impeller to disperse the incoming gas, with two up-pumping, four-blade, Maxflo (MFU) hydrofoils above to ensure effective axial mixing from top to bottom of the tank. The standard Eulerian−Eulerian formulation of the k−e turbulence model with multiple frames of reference (MFR) was used in the simulation. A population balance model (PBM) combined with a multiple size group (MUSIG) model has been implemented using the commercial CFX code. Bubble breakup and coalescence have been modeled fundamentally using isotropic turbulence theory. An alternative approach was provided by an Euler−Euler computation assuming a constant single average bubble diameter (SABD), set to 4 mm. These SABD results were compared with those predicted by the MUSIG model and ...
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