Vortex Simulation of Bubble Plume around a Rectangular Cylinder

Abstract

The bubble plume around a square-section cylinder is simulated. The two-dimensional vortex method for gas-liquid two-phase flow, proposed by the authors in a prior paper, is employed. The small air bubbles are injected into still water from a nozzle below a square-section cylinder of which side length is equivalent to the nozzle width. The water velocity on the horizontal cross-sections satisfies the similarity distribution around the plume centerline. The cylinder affects mainly the water flow in the upper region. The water velocity is lower, but the vertical component of the water turbulent intensity is two times higher than those for the plume without the cylinder. The water flow spreads more toward the horizontal direction.