CFD simulation of gas dispersion dynamics in liquid cross-flows

Single and multiphase flow dynamics around bluff bodies in liquid cross-flows have been investigated using CFD modelling. For a series of different turbulence models, the CFD simulations predict the surface pressure coefficients around a cylindrical bluff body located in a single-phase liquid cross-flow (Re = 2 x 10(4)). The results are obtained in a form suitable for application in an algorithm for the modelling of gas induction parameters during operation of a gas-inducing impeller in both the pulse bubbling and cavity gas dispersion regimes. For a flat blade impeller in a normal orientation within a turbulent liquid cross-flow, and ventilated with gas from an orifice on the rear side of the blade, preliminary data for the shape and breakup length of ventilated gas cavities has also been obtained using a multiphase CFD simulation. (C) 1998 Elsevier Science Inc. All rights reserved.