Elasto-inertial turbulence Journal Article

Author(s): Samanta, Devranjan; Dubief, Yves C; Holzner, Markus; Schäfer, Christof; Morozov, Alexander N; Wagner, Christian C; Hof, Björn
Article Title: Elasto-inertial turbulence
Affiliation IST Austria
Abstract: Turbulence is ubiquitous in nature, yet even for the case of ordinary Newtonian fluids like water, our understanding of this phenomenon is limited. Many liquids of practical importance are more complicated (e.g., blood, polymer melts, paints), however; they exhibit elastic as well as viscous characteristics, and the relation between stress and strain is nonlinear. We demonstrate here for a model system of such complex fluids that at high shear rates, turbulence is not simply modified as previously believed but is suppressed and replaced by a different type of disordered motion, elasto-inertial turbulence. Elasto-inertial turbulence is found to occur at much lower Reynolds numbers than Newtonian turbulence, and the dynamical properties differ significantly. The friction scaling observed coincides with the so-called "maximum drag reduction" asymptote, which is exhibited by a wide range of viscoelastic fluids.
Keywords: Elastic instabilities; Non-Newtonian fluids; Polymer drag reduction; Transition to turbulence
Journal Title: PNAS
Volume: 110
Issue 26
ISSN: 1091-6490
Publisher: National Academy of Sciences  
Date Published: 2013-06-25
Start Page: 10557
End Page: 10562
Sponsor: D.S. and C.S. were partly funded by Deutsche Forschungsgemeinschaft Project WA1336-5-1. A.N.M. was funded by the Engineering and Physical Sciences Research Council (Grant EP/I004262/1).
DOI: 10.1073/pnas.1219666110
Open access: yes (repository)