Dynamics of a bubble-pair between two parallel rigid walls

This numerical study investigates the dynamics of two gas bubbles placed side-by-side in liquid between parallel rigid plates using OpenFOAM’s multiphase volume of fluid (VOF) model.

This numerical study investigates the dynamics of two gas bubbles placed side-by-side in liquid between parallel rigid plates using OpenFOAM’s multiphase volume of fluid (VOF) model. The research examines how initial bubble sizes and distances from rigid walls affect bubble behavior.

Three distinct scenarios are identified for symmetrically placed bubbles based on the relative influence of bubble-bubble and bubble-wall interactions: balanced interaction, dominant bubble-bubble interaction, and dominant bubble-wall interaction. For asymmetrically placed bubbles, different collapse patterns emerge. Key findings include characterization of jet strength and direction, bubble oscillation periods, coalescence phenomena, and pressure impacts on rigid walls.

The model was validated against experimental data from single bubble oscillations and bubble-pair interactions. This work provides valuable insights into the complex hydrodynamics of bubble pairs bounded by rigid surfaces, with potential applications in electro-discharge machining and cardiovascular treatments.