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Capillary pinching in a pinched microchannel

Amyot, Olivier and Plouraboué, Franck Capillary pinching in a pinched microchannel. (2007) Physics of Fluids, vol. 19 (n° 3). pp. 033101-1-033101-10. ISSN 1070-6631

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Official URL: http://dx.doi.org/10.1063/1.2709704

Abstract

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.

Item Type:Article
Additional Information:Thanks to American Institute of Physics editor. The definitive version is available at http://pof.aip.org/ The original PDF of the article can be found at Physics of Fluids website : http://pof.aip.org/resource/1/phfle6/v19/i3/p033101_s1
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Franck PLOURABOUE

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