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Heterogeneous flow inside threads of low viscosity fluids leads to anomalous long filament lifetimes

Recktenwald, Steffen M.; Haward, Simon J.; Shen, Amy Q.; Willenbacher, Norbert

Abstract:
Formation and breakup of fluid threads is pervasive in nature and technology, where high extensibility of fluid filaments and extended filament lifetimes are commonly observed as a consequence of fluid viscoelasticity. In contrast, threads of low viscous Newtonian fluids like water rupture quickly. Here, we demonstrate that a unique banding instability during filament thinning of model surfactant solutions, with a viscosity close to water and no measurable elasticity, leads to extremely long filament lifetimes and to the formation of remarkably long threads. Complementary measurements in planar extension as well as in shear reveal that this flow instability is characterized by a multivalued stress, arising beyond a critical strain rate, irrespective of flow kinematics. Our work reports the first observation of such phenomena during extensional deformation and provides a unifying view on instabilities in complex flow fields.

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Verlagsausgabe §
DOI: 10.5445/IR/1000094527
Veröffentlicht am 13.05.2019
Originalveröffentlichung
DOI: 10.1038/s41598-019-43590-z
Coverbild
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000094527
Erschienen in Scientific reports
Band 9
Heft 1
Seiten Article: 7110
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 08.05.2019
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