TY - JOUR
T1 - Heterogeneous flow inside threads of low viscosity fluids leads to anomalous long filament lifetimes
AU - Recktenwald, Steffen M.
AU - Haward, Simon J.
AU - Shen, Amy Q.
AU - Willenbacher, Norbert
N1 - Funding Information:
S.M.R. and N.W. gratefully acknowledge Karlsruhe House of Young Scientists (KHYS), supporting a research internship at Okinawa Institute of Science and Technology Graduate University. S.M.R. is grateful to Mr. Kevin Tedjokusuma for help with CaBER measurements and to Mr. Lukas Böni from ETH Zürich for generously providing hagfish mucus sample. The authors also wish to acknowledge fruitful discussions with Prof. G. H. McKinley from MIT. S.M.R. and N.W. acknowledge financial support from Deutsche Forschungsgemeinschaft under DRG grant number WI3138/22-1. S.J.H., A.Q.S. and S.M.R. gratefully acknowledge the support of Okinawa Institute of Science and Technology Graduate University, with subsidy funding from the Cabinet Office, Government of Japan. S.J.H. and A.Q.S. also acknowledge funding from the Japan Society for the Promotion of Science (Grant Nos 17K06173, 18H01135 and 18K03958).
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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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U2 - 10.1038/s41598-019-43590-z
DO - 10.1038/s41598-019-43590-z
M3 - Article
C2 - 31068644
AN - SCOPUS:85065566093
VL - 9
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 7110
ER -