A study on dynamical mass transfer mechanism between a zigzagging CO2 bubble and its surrounding liquid via PIV/LIF

In this research, a mass transfer process of single rising bubbles is investigated by using PIV (Particle Image Velocimetry) and LIF (Laser Induced Fluorescence) measurement, focusing on a coupling mechanism between the mass transfer (from a bubble to liquid phase) and its surrounding liquid motion. First, both mass transfer process and wake of the single rising bubble were visualized via LIF. Next, the relationship between mass transfer and shape oscillations of the bubble interface is discussed. As a result, the shape oscillations are considered to play an important role in the mass transportation between bubbles and their surrounding liquid. Finally, the mass transportation during a collision of a pair of zigzagging bubbles was investigated. From the results, we conclude that the collision of the bubbles enhances the mass transportation of CO2 to upward direction.