Role of the channel geometry on the bubble pinch-off in flow-focusing devices

被引：197

作者：

Dollet, Benjamin ^{[1
]}

van Hoeve, Wim ^{[1
]}

Raven, Jan-Paul ^{[2
]}

Marmottant, Philippe ^{[2
]}

Versluis, Michel ^{[1
]}

机构：

[1] Univ Twente, NL-7500 AE Enschede, Netherlands

[2] Univ Grenoble 1, Spectrometrie Phys Lab, CNRS, UMR 5588, F-38402 St Martin Dheres, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.100.034504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The formation of bubbles by flow focusing of a gas and a liquid in a rectangular channel is shown to depend strongly on the channel aspect ratio. Bubble breakup consists in a slow linear 2D collapse of the gas thread, ending in a fast 3D pinch-off. The 2D collapse is predicted to be stable against perturbations of the gas-liquid interface, whereas the 3D pinch-off is unstable, causing bubble polydispersity. During 3D pinch-off, a scaling w(m) similar to tau(1/3) between the neck width w(m) and the time tau before breakup indicates that breakup is driven by the inertia of both gas and liquid, not by capillarity.

引用

页数：4

共 27 条

[1] Capillary pinching in a pinched microchannel [J].