Elastic Alfven waves in elastic turbulence
| Autor: | Atul Varshney, Victor Steinberg |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
530 Physics Science FOS: Physical sciences General Physics and Astronomy 02 engineering and technology Condensed Matter - Soft Condensed Matter Article General Biochemistry Genetics and Molecular Biology Viscoelasticity Physics::Fluid Dynamics Alfvén wave 03 medical and health sciences Physics::Plasma Physics Speed of sound Weissenberg number Elasticity (economics) lcsh:Science Physics Multidisciplinary Fluid Dynamics (physics.flu-dyn) Physics - Fluid Dynamics General Chemistry Mechanics Stokes flow 021001 nanoscience & nanotechnology Physics - Plasma Physics Open-channel flow Plasma Physics (physics.plasm-ph) 030104 developmental biology 532 Fluid mechanics Liquid mechanics Physics::Space Physics Compressibility Soft Condensed Matter (cond-mat.soft) lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019) |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-019-08551-0 |
| Popis: | Speed of sound waves in gases and liquids is governed by medium compressibility. There exists another type of non-dispersive waves which speed depends on stress instead of medium elasticity. A well-known example is the Alfven wave propagating, with a speed determined by a magnetic tension, in plasma permeated by a magnetic field. Later, an elastic analog of the Alfven waves has been predicted in a flow of dilute polymer solution, where elastic stress engendered by polymer stretching determines the elastic wave speed. Here, we present quantitative evidence of elastic Alfven waves observed in elastic turbulence of a viscoelastic creeping flow between two obstacles hindering a channel flow. The key finding in the experimental proof is a nonlinear dependence of the elastic wave speed $c_{\mathrm{el}}$ on Weissenberg number $\mathrm{Wi}$, which deviates from the prediction based on a model of linear polymer elasticity. Comment: 7 pages, 5 figures |
| Databáze: | OpenAIRE |
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