Numerical Simulation of Bubble Plume in a Tank with Free Surface.

A bubble-driven plume in a tank with a free surface is investigated numerically using the bubble flow model equations which are formulated with emphasis on the relative transverse motion and volumetric change of the bubble. A numerical scheme is developed by the derivation of the pressure equation for the bubbly flow in order to treat the effects of the relative motion between two phases and the compressibility of the bubble accurately. From the numerical results, the three-dimensional flow structure of the bubble-driven plume has been shown in detail, where there are turbulences on various scales caused by the interaction of liquid convection and bubble motion.