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Phys. Rev. Lett. 95, 164504 (2005) [4 pages]

Droplet Detachment and Satellite Bead Formation in Viscoelastic Fluids

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C. Wagner1,*, Y. Amarouchene2,3, Daniel Bonn3,4, and J. Eggers5
1Experimentalphysik, Universität des Saarlandes, Postfach 151150, 66041 Saarbrücken, Germany
2Centre de Physique Moléculaire Optique et Hertzienne, Université Bordeaux 1 (UMR 5798), 351 cours de la liberation, 33405 Talence, France
3Laboratoire de Physique Statistique, UMR CNRS 8550, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
4van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands
5School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, United Kingdom

Received 16 July 2004; published 14 October 2005

The presence of a very small amount of high molecular weight polymer significantly delays the pinch-off singularity of a drop of water falling from a faucet and leads to the formation of a long-lived cylindrical filament. In this Letter, we present experiments, numerical simulations, and theory which examines the pinch-off process in the presence of polymers. The numerical simulations are found to be in good agreement with experiment. As a test case, we establish the conditions under which a small bead remains on the filament; we find that the presence of a bead is due to the asymmetry induced by the self-similar pinch off of the droplet.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.164504
DOI:
10.1103/PhysRevLett.95.164504
PACS:
47.55.Dz, 47.20.Dr, 47.20.Gv, 83.80.Rs

*Electronic address: c.wagner@mx.uni-saarland.de

 
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