水中上升气泡力学行为的实验研究

In this paper, the method of high-speed photography was used to investigate the bubble variation of the shape and path when rising in water. Bubbles with initial diameter from 2 to 5 mm were investigated. The results showed that the equivalent diameter of bubbles will be oscillation slightly in the course of rising. To the bubble with respectively large initial diameter, its horizontal swing amplitude would decreased during the process of rising, thus will lead to the movement of bubbles become more complexly and the shape will deviated from the ellipsoidal obviously, and the shape oscillation caused by the initial tensile force will be more severely and be not easy to damp. In further more, the expansion of volume for bubble is effected less in the whole process. The increased resistance of horizontal swing amplitude, the roll and distortion of bubbles will lead to the decreasing of terminal velocity and the peak horizontal velocity. It will get the first maximum velocity quickly and the horizontal velocity attenuates fast too.