期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 26, 页码 10557-10562出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1219666110
关键词
elastic instabilities; polymer drag reduction; non-Newtonian fluids; transition to turbulence
资金
- Forschungsgemeinschaft Project [WA1336-5-1]
- Engineering and Physical Sciences Research Council [EP/I004262/1]
- EPSRC [EP/I004262/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004262/1] Funding Source: researchfish
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.
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