Flow enhancement due to elastic turbulence in channel flows of shear thinning fluids

Flow enhancement due to elastic turbulence in channel flows of shear thinning fluids

We explore the flow of highly shear thinning polymer solutions in straight geometry. The strong variations of the normal forces close to the wall give rise to an elastic instability. We evidence a periodic motion close the onset of the instability, which then evolves towards a turbulentlike flow at...

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Veröffentlicht in:Physical review letters 2015-01, Vol.114 (2), p.028302-028302, Article 028302
Hauptverfasser: Bodiguel, Hugues, Beaumont, Julien, Machado, Anaïs, Martinie, Laetitia, Kellay, Hamid, Colin, Annie
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Sprache:eng
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Fluid Dynamics
Fluid flow
Homogenizing
Instability
Physics
Stability
Turbulence
Turbulent flow
Walls
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container_issue 2
container_start_page 028302
container_title Physical review letters
container_volume 114
creator Bodiguel, Hugues
Beaumont, Julien
Machado, Anaïs
Martinie, Laetitia
Kellay, Hamid
Colin, Annie
description We explore the flow of highly shear thinning polymer solutions in straight geometry. The strong variations of the normal forces close to the wall give rise to an elastic instability. We evidence a periodic motion close the onset of the instability, which then evolves towards a turbulentlike flow at higher flow rates. Strikingly, we point out that this instability induces genuine drag reduction due to the homogenization of the viscosity profile by the turbulent flow.
doi_str_mv 10.1103/physrevlett.114.028302
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source American Physical Society Journals
subjects Fluid Dynamics
Fluid flow
Homogenizing
Instability
Physics
Stability
Turbulence
Turbulent flow
Walls
title Flow enhancement due to elastic turbulence in channel flows of shear thinning fluids
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