Instability of a polymeric thread

When a liquid containing a dilute solution of long, flexible polymers breaks up under the action of surface tension, it forms long threads of nearly uniform thickness. However, at a thickness in the order of microns, the thread becomes unstable to the formation of a non-uniform “blistering” pattern:...

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Veröffentlicht in:Physics of fluids (1994) 2014-03, Vol.26 (3)
1. Verfasser: Eggers, J.
Format: Artikel
Sprache:eng
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Zusammenfassung:When a liquid containing a dilute solution of long, flexible polymers breaks up under the action of surface tension, it forms long threads of nearly uniform thickness. However, at a thickness in the order of microns, the thread becomes unstable to the formation of a non-uniform “blistering” pattern: tiny drops separated by threads of highly concentrated polymer solution. We show that standard models for the coupling between stress and polymer concentration lead to a linear instability, which exhibits very strong transient growth of the free surface perturbation. A high concentration of polymer remains in the thread part of the structure.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4869721