Bubble Induced Entrainment Between Stratified Liquids- Visual Description of Bubble Size Effect on Interfacial Phenomena
Volume Title: 1
Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
The size of rising bubbles strongly influences entrainment between immiscible fluids, especially in metal purification and floatation separation processes. Due to the visualization restrictions at high temperatures, a bubble passing hexane-water interface is studied at 25 C. Interfacial phenomena of a bubble colliding the liquid-liquid interface has been investigated using image processing techniques. The bubble size affects terminal velocity and shape of rising bubble in any liquid. According to the visualization results, bubble size can control bubble bouncing at liquid-liquid interface, entrainment of heavy liquid to the light one, and rupture of heavy liquid film. In order to provide liquid-liqiud surface area in bubbling system, the size of rising bubbles should be adjusted to have spherical cap shape bubbles.