关键词: 液体, 气泡, 气泡尺寸, 运动行为, 气泡破碎, 单气泡, 气泡群, 气泡形状

Abstract:

A review is conducted on the single bubble motion behavior and bubble group motion behavior of bubbles in the liquid layer. The bubble motion behavior is studied using high-speed cameras, particle image velocimetry technique(PIV), and numerical calculations. The results show that factors such as liquid properties, bubble size, bubble tail vortex lead to different upward paths of bubbles in the liquid layer showing straight, spiral, and zigzag shapes; factors such as pressure, inlet volume, and liquid properties cause changes in the shape of bubbles; the effect of the upward velocity, the degree of liquid turbulence, viscous shear force, buoyancy and other forces will manifest the bubble behavior as aggregation, collision and fragmentation. The existing studies pay less attention to the internal motion of bubbles, the mass transfer mechanism and bubble groups. In the future, the mass transfer mechanism can be improved by analyzing the fluid behavior inside bubbles, the interactions between bubble groups, and influencing factors. Strengthening mass transfer at the mesoscale can be achieved by adding bubble-breaking internal components to forcibly break large bubbles, reducing the bubble size, increasing mass transfer area and residence time, in order to enhance mass transfer.

Key words: liquid, bubble, bubble size, motor behavior, bubble-breaking, single bubble, bubble group, bubble shape