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Elastic Alfven waves in elastic turbulence

Author

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  • Atul Varshney

    (Weizmann Institute of Science
    Institute of Science and Technology Austria)

  • Victor Steinberg

    (Weizmann Institute of Science
    Hebrew University of Jerusalem)

Abstract

Speed of sound waves in gases and liquids are governed by the compressibility of the medium. There exists another type of non-dispersive wave where the wave speed depends on stress instead of elasticity of the medium. A well-known example is the Alfven wave, which propagates through plasma permeated by a magnetic field with the speed determined by magnetic tension. An elastic analogue of Alfven waves has been predicted in a flow of dilute polymer solution where the elastic stress of the stretching polymers determines the elastic wave speed. Here we present quantitative evidence of elastic Alfven waves in elastic turbulence of a viscoelastic creeping flow between two obstacles in channel flow. The key finding in the experimental proof is a nonlinear dependence of the elastic wave speed cel on the Weissenberg number Wi, which deviates from predictions based on a model of linear polymer elasticity.

Suggested Citation

  • Atul Varshney & Victor Steinberg, 2019. "Elastic Alfven waves in elastic turbulence," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08551-0
    DOI: 10.1038/s41467-019-08551-0
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    Cited by:

    1. Rahul K. Singh & Prasad Perlekar & Dhrubaditya Mitra & Marco E. Rosti, 2024. "Intermittency in the not-so-smooth elastic turbulence," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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