大气泡在水中上升的运动状态模拟

Numerical simulation on motion state of big floating bubbles in water

为得到尺寸相对较大(D≥20 mm)的气泡在水中上升时流场及气泡形状的变化情况,用Fluent软件分别对水中有一个或多个大气泡涌入后,气泡的运动过程进行了模拟.对一个气泡上升的过程进行数值模拟,得出气泡形状由球形逐渐变为小圆帽形.对连续多个气泡上升的过程进行模拟,可以看到当第一个气泡已变成小圆帽形状时第二个气泡略有变扁.若从第一个气泡开始算起,以2个气泡为一组,则组与组之间运动规律是相似的.

In order to get the changes of shape and flow field of floating bubbles with relatively large size （D≥ 20mm）, this paper simulated the motion processes of one and multiple large floating bubbles with FLUENT software. Simulation on one bubble showed that when air bubble rose in the water the shape changed from spherical gradually into a small round cap. The condition of continuous multiple air divided into a group bubbles was also simulated. It showed that when the first bubble became a small round cap shape, the second one was slightly flat. Starting from the first bubble, two bubbles was divided into a group, then the motion between the different groups was similar.