Vortex interactions between a pair of bubbles rising side by side in ordinary viscous liquids
Vortex interactions between a pair of bubbles rising side by side in ordinary viscous liquids
复制标题
普通粘性液体中并排上升的一对气泡之间的涡旋相互作用
DOI：
10.1103/physrevfluids.4.043604
复制
发表时间：
2019
影响因子：
2.7
通讯作者：
Ming-Jiu Ni
中科院分区：
文献类型：
--
作者：
Jie Zhang;Long Chen;Ming-Jiu Ni
We report on a series of numerical results about a pair of bubbles rising side by side in various silicone oils, with the terminal Reynolds number to vary between 10 and 700 and the aspect ratio of the bubble shapes to vary between 1.0 and 3.2. Through fully solving the three-dimensional Navier-Stokes equations, different interactive behaviors between the two bubbles are reproduced, such as the repelling, the attracting coalescence, the attracting bounce, and the repeated bounce, which are also observed in the experiments. First, we determine that, if there are no toroidal vortex rings attached at the rear end of the bubbles, the moderate- to high-Reynolds-number bubbles tend to attract with one another after being released, and, subsequently, whether they will coalesce or bounce after contact depends on the development of the vortex structures. In contrast, if toroidal vortex rings are generated in the bubble wake in other parameter spaces, a pair of bubbles will repel one another after being released, and a subsequent repeated bounce will be even observed. Lastly, an available force calculation model enables us to identify the relation between the forces and the vorticity produced on the bubbles when the pair of bubbles collide.
