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Vortex merging and splitting: A route to elastoinertial turbulence in Taylor-Couette flow

Lacassagne, T; Cagney, N; Gillissen, JJJ; Balabani, S; (2020) Vortex merging and splitting: A route to elastoinertial turbulence in Taylor-Couette flow. Physical Review Fluids , 5 (11) , Article 113303. 10.1103/PhysRevFluids.5.113303. Green open access

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Abstract

We report experimental evidence of a new merge-split transition (MST) to elastoinertial turbulence (EIT) in Taylor-Couette flows of viscoelastic polymer solutions, caused by merging and splitting of base Taylor vortices when crossed by elastic axial waves (rotating standing waves, RSW). These vortex merging and splitting events are not due to transient behavior, finite aspect ratio, or shear-thinning behavior. They are random in nature and increase in frequency with Re; when superimposed on a RSW flow state they cause abrupt changes in the axial spatial wavelength, leading to the transition from a RSW to the EIT state. We thus identify MST as an inertial feature solely triggered by elasticity and independent of any shear-thinning behavior.

Type: Article
Title: Vortex merging and splitting: A route to elastoinertial turbulence in Taylor-Couette flow
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevFluids.5.113303
Publisher version: https://doi.org/10.1103/PhysRevFluids.5.113303
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Non-Newtonian fluids, Taylor-Couette system, Transition to turbulence
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10116101
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