Abstract
Pouring air bubbles from nozzle is used for the industrial field, such as stirring, separating from the past to now. Therefore, many studies on dynamic characteristic of the shape change and detachment of air bubbles were reported. On the other hand, it is a few that studying mainly about surface wettability that have an effect on bubble detachment. In this study, we blow air under constant flow conditions by using super water repellent nozzle such as over 120-degree contact angle for evaluating surface wettability influence bubble detachment process. Consequently, the detachment frequency is smaller, and the bubble volume is larger in case of using water repellent nozzle because it requires a longer time to release the bubble. Moreover, the water repellent nozzle can be applied to the existing correlation formula by taking the outer diameter that is equivalent to wetted perimeter in nozzle surface.
