Author(s): M. Rezvani; A. L. Dissanayake; S. A. Socolofsky
Linked Author(s): Scott A. Socolofsky
Keywords: Bubble plume; Cross flow; PIV; Multiphase turbulent flows; Reynolds stresses
Abstract: This study presents results from the analysis of the velocity field and turbulence statistics measured downstream of a round bubble plume in the presence of crossflows. Experiments were conducted in a glass-walled flume which was equipped with a recirculation system to generate the background flow. 2D planar PIV results were used to measure the velocity field and turbulence intensities in the wake of the bubble plume. Profiles of turbulence intensities and Reynolds stresses are presented for this kind of flow for the first time, and the effects of bubbles on turbulence generation are investigated experimentally. From the profiles of mean velocity and second order turbulence statistics, we found the following: The existence of bubbles affects the mean flow, generating an upward mean velocity and augmenting the turbulent intensity; and, the wake turbulence is anisotropic with anisotropy being increased by increasing the bubble flow rate.
Year: 2016