Study on the behavior of bubbles colliding with hydrophilic and hydrophobic curved walls

The research on the behavior and influencing factors of bubble colliding with solid wall has always been one of the focuses of the scientific community. Its application in mineral flotation, gas film drag reduction and other industrial fields is also of great scientific research value. This paper focuses on the influence of curved wall on bubble impact behavior. A high-speed video camera was used to record the impact process of bubbles impacting hydrophilic and hydrophobic curved walls with different radius of curvature. The effects of wettability and radius of curvature of curved walls on bubbles impacting solid curved walls were analyzed. The results show that the bubble will bounce many times when it collides with the hydrophilic curved wall until it leaves the curved wall; The larger the radius of curvature, the less the number of bounces, and the closer the longest distance of the first bounce, the smaller the speed of hitting the wall again. In addition, 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. The prediction error is less than 5.0%.