CFD simulation of alleviation of fluid back mixing by baffles in bubble column

The global back mixing of liquid in an open flotation column is harmful to mineral separations. The inclusion of baffles and packing in open columns can dampen the effects of global back mixing. A mathematical model based on the principle of fluid dynamics is helpful in designing baffled or packed columns. This paper presents a two-dimensional Euler–Lagrangian model to simulate the multiphase flow for some cases of baffled and packed columns. Fluid motion is calculated by directly solving the Navier–Stokes equations by a SIMPLE approach. Bubbles are moved in a Lagrangian frame through the interaction forces imposed by the gas–fluid coupling. The simulated results successfully reveal that the liquid back-mixing effect in the open bubble columns can be alleviated by baffles or packings.