Influence of the Impact Velocity and Size of the Film Formed on Bubble Coalescence Time at Water Surface
Influence of the Impact Velocity and Size of the Film Formed on Bubble Coalescence Time at Water Surface
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DOI：
10.1021/la104324u
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发表时间：
2011-03-15
期刊：
影响因子：
3.9
通讯作者：
Malysa, Kazimierz
中科院分区：
文献类型：
--
作者：
Zawala, Jan;Malysa, Kazimierz
研究了气泡与水/空气界面碰撞过程中发生的现象。气泡冲击速度通过以下方式调节：（i）改变气泡直径和（ii）调节气泡形成点和水自由表面之间的距离（在气泡加速阶段）。发现气泡的弹跳和聚结时间，即，从气泡第一次碰撞到破裂的时间随碰撞速度的增加而增加。聚结时间从几秒到几秒不等。当气泡冲击速度从8.0 cm/s改变到36.7 cm/s时，120 ms。结果表明，聚并时间的延长与气泡碰撞时形成的液膜大小有关。高碰撞速度越大，气泡形状变形越大，形成的液膜半径越大。结果表明，当气泡与空气/水界面之间的薄水膜在碰撞时间内未达到破裂厚度时，气泡发生弹跳。
Phenomena occurring during bubble collisions with a water/air interface were studied. The bubble impact velocity vas tuned by the following: (i) changing the bubble diameter and (ii) adjusting the distance between, the bubble formation point and the water free surface (at the bubble acceleration stage). It was found that the bubble bouncing and the coalescence time, i.e., the time from the moment of the bubbles first collision to its rupture, increased with the impact velocity. The coalescence time varied from a few to ca. 120 ms when the bubble impact velocity was changed from 8.0 to 36.7 cm/s. It was found that a prolongation of the coalescence time was related to size of the liquid film formed during, the bubble collision. Higher. impact velocity means larger deformation of the bubble shape and larger radius of the liquid film formed It was shown that the bubble bounces when the thinning water film between the bubble and the air/water interface does not reach its rupture thickness during the collision time.