Blister formation phenomenon for droplet impact under different liquid pool depths
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摘要: 液池内液滴撞击成泡现象广泛存在，具有重要科研价值。利用高速摄像技术，测试了液滴从3~15m高度下落撞击不同深度液池时的液面成泡现象，给出了液池深度和液滴韦伯数We对撞击成泡的影响规律。结果表明：液滴撞击浅液池时，可以在撞击中心处形成1个圆泡，但撞击深液池时，则会先形成环形水泡，进而发展成1或2个圆泡，且成泡位置并不在撞击中心位置；在液滴撞击速度、液池深度、回落二次液滴等因素影响下，液滴撞击成泡现象呈现复杂的概率分布特性。Abstract: Droplet impact in the liquid pool is an ubiquitous phenomenon in nature and it has essential scientific research value. Via the high-speed camera technology, the extraordinary blister formation phenomenon on the liquid pool surface is studied when the droplets fall from various heights of 3m to 15m to the liquid pool of different depths. The effects of the depth of the liquid pool and the We number of droplets on the blister formation are given. It is shown that a droplet can form a blister at the center of the impact when it hits the shallow pool. However, when it hits the deep pool, it forms an annular blister, which then develops into one or two blisters, and the blister formation position is not at the location of the impact. In addition, under the influence of factors such as the droplet impact velocity, the liquid pool depth and the secondary droplet drop, the blister formation phenomenon for the droplet impact presents complex probability distri-bution characteristics.
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Key words:
- droplet /
- impacting /
- liquid surface foaming /
- liquid pool
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图 2 液滴撞击浅液池时水泡的形成过程(H=3mm、h=15m、We=6047)
Figure 2. The formation process of the blister when the droplets hit the shallow liquid pool (H=3mm, h=15m, We=6047)
图 3 液滴撞击深液池时1个水泡的形成过程(H=30mm、h=12.5m、We=4509)
Figure 3. The formation process of one blister when the droplet hits the deep liquid pool (H=30mm, h=12.5m, We=4509)
图 4 液滴撞击深液池时2个水泡的形成过程(H=30mm、h=12.5m、We=5087)
Figure 4. The formation process of two blisters when the droplet hits the deep liquid pool (H=30mm, h=12.5m, We=5087)
图 5 相同液滴体积下成泡概率与韦伯数(We)关系
Figure 5. Relationship between blister formation probability and Weber number (We) under the same droplet volume
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