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Dynamic interfacial tension effects in the rupture of liquid necks

Published online by Cambridge University Press:  06 January 2012

M. Robert de Saint Vincent ,
J. Petit ,
M. Aytouna ,
J. P. Delville ,
D. Bonn  and
H. Kellay
M. Robert de Saint Vincent
Affiliation:
Laboratoire Ondes et Matière d’Aquitaine (UMR 5798 CNRS), U. Bordeaux 1, 351 cours de la Libération, 33405 Talence, France
J. Petit
Affiliation:
Laboratoire Ondes et Matière d’Aquitaine (UMR 5798 CNRS), U. Bordeaux 1, 351 cours de la Libération, 33405 Talence, France
M. Aytouna
Affiliation:
Van Der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018XE Amsterdam, The Netherlands
J. P. Delville
Affiliation:
Laboratoire Ondes et Matière d’Aquitaine (UMR 5798 CNRS), U. Bordeaux 1, 351 cours de la Libération, 33405 Talence, France
D. Bonn
Affiliation:
Van Der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018XE Amsterdam, The Netherlands Laboratoire de Physique Statistique de l’ENS, 24 rue Lhomond, 75005 Paris, France
H. Kellay*
Affiliation:
Laboratoire Ondes et Matière d’Aquitaine (UMR 5798 CNRS), U. Bordeaux 1, 351 cours de la Libération, 33405 Talence, France
*
†Email address for correspondence: hamid.kellay@u-bordeaux1.fr
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Abstract

By examining the rupture of fluid necks during droplet formation of surfactant-laden liquids, we observe deviations from expected behaviour for the pinch-off of such necks. We suggest that these deviations are due to the presence of a dynamic (time-varying) interfacial tension at the minimum neck location and extract this quantity from our measurements on a variety of systems. The presence of such dynamic interfacial tension effects should change the rupture process drastically. However, our measurements show that a simple ansatz, which incorporates the temporal change of the interfacial tension, allows us to understand the dynamics of thinning. This shows that this dynamics is largely independent of the exact details of what happens far from the breakup location, pointing to the local nature of the thinning dynamics.

JFM classification

Drops and Bubbles: Breakup/coalescence Interfacial Flows (free surface): Liquid bridges
Type
Papers
Information
Journal of Fluid Mechanics , Volume 692 , 10 February 2012 , pp. 499 - 510
Copyright
Copyright © Cambridge University Press 2012

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