Abstract
Bubble ring is a kind of stable gas bubble form in liquid where gas bubble is trapped in the vortex ring due to the centripetal force. In this paper, we compared the behaviors of bubble ring (two-phase flow) with those of vortex ring (single-phase flow). The gas bubble that launched downward and successfully formed a bubble ring went downward stably against the buoyancy force, while the gas bubble failed to form a bubble ring grew up instantly after launch.
