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  • Letter

Relaminarization of elastic turbulence

M. Vijay Kumar1,2,3,*, Atul Varshney1,4,5,*, Dongyang Li1,6, and Victor Steinberg1,2

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
  • 2The Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel
  • 3Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
  • 4School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni-752050, Odisha, India
  • 5Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria
  • 6College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China

  • *These authors contributed equally to this work.
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Phys. Rev. Fluids 7, L081301 – Published 3 August, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.L081301

Abstract

We report frictional drag reduction and a complete flow relaminarization of elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow past an obstacle. We show that the intensity of the observed elastic waves and wall-normal vorticity correlate well with the measured drag above the onset of ET. Moreover, we find that the elastic wave frequency grows with the Weissenberg number, and at sufficiently high frequency it causes a decay of the elastic waves, resulting in ET attenuation and drag reduction. Thus, this allows us to substantiate a physical mechanism, involving the interaction of elastic waves with wall-normal vorticity fluctuations, leading to the drag reduction and relaminarization phenomena at low Reynolds number.

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Phys. Rev. Fluids 7, L081301– Published 3 August, 2022
  • Received 30 October 2021
  • Accepted 22 July 2022
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