STUDY ON THE BEHAVIOR OF BUBBLES COLLIDING WITH HYDROPHILIC AND HYDROPHOBIC CURVED WALLS

The research on the behavior and influencing factors of bubble collision has always been one of the focuses of scientific circles. Its application in industrial fields such as mineral flotation and gas film drag reduction is also of great scientific research value. This paper focuses on the influence of curved wall on bubble impact behavior. The impact process of bubbles colliding with hydrophilic and hydrophobic curved wall under different radius of curvature was recorded by high-speed camera technology, and the effects of wettability and radius of curvature of curved wall on bubbles colliding with solid curved wall were analyzed. The results show that when the bubble collides with the hydrophilic curved wall, it will bounce many times until it leaves the curved wall; The larger the radius of curvature, the less the number of jumps, and the closer the farthest distance of the first rebound, the smaller the speed of hitting the wall again. In addition, aiming at the phenomenon of liquid film extrusion rupture, a theoretical model is established to deduce the prediction formula of liquid film induction time, which is mainly related to the thickness of liquid film, the critical rupture thickness of liquid film and the compression speed of liquid film, and the prediction error is less than 5.0%.