Capillary pinching in a pinched microchannel
Capillary pinching in a pinched microchannel
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收缩微通道中的毛细管收缩
DOI：
10.1063/1.2709704
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发表时间：
2005
影响因子：
4.6
通讯作者：
F. Plouraboué
中科院分区：
文献类型：
--
作者：
O. Amyot;F. Plouraboué
本文研究了在收缩通道内润湿液体对气泡的毛细收缩作用。毛细收缩以非常明确的频率诱导非常可再现的起泡。有两种与滴注和喷射鼓泡相关的状态。在后者中，我们表明，高度单分散的气泡形成我们的捏通道。气泡形成的动力学也表现出两个不同的制度：一个长时间的伸长的气泡和界面破裂后的界面的快速松弛。缓慢的制度取决于施加的通量和通道的几何形状。快速变形动力学机制对边界条件的依赖性很弱。尺度参数提出的润滑近似的上下文中描述的两个制度。
We report a study of the capillary pinching of a gas bubble by a wetting liquid inside a pinched channel. The capillary pinching induces very reproducible bubbling, at a very well-defined frequency. There are two regimes associated with drip and jet bubbling. In the latter, we show that highly monodispersed bubbles are formed by our pinched channel. The dynamics of the bubble formation also shows two distinct regimes: a long-duration elongation of the air bubble and a rapid relaxation of the interface after interface breakup. The slow regime depends on the flux imposed and the channel geometry. The rapid deformation dynamic regime depends very weakly on the boundary conditions. Scaling arguments are proposed in the context of the lubrication approximation to describe the two regimes.