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Oscillating grid generating turbulence near gas-liquid interfaces in shear-thinning dilute polymer solutions

Lacassagne, T; Simoëns, S; El Hajem, M; Champagne, J-Y; (2020) Oscillating grid generating turbulence near gas-liquid interfaces in shear-thinning dilute polymer solutions. Physical Review Fluids , 5 (3) , Article 033301. 10.1103/physrevfluids.5.033301. Green open access

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Abstract

Understanding the behavior of liquid phase turbulence near gas-liquid interfaces is of great interest in many fundamental, environmental, or industrial applications. For example, near-surface liquid side turbulence is known to enhance the mass transfers between the two phases. Descriptions of this behavior for air-water systems exist in the literature, but the case of turbulence in a shear-thinning liquid phase below a flat gas-liquid interface has never been considered to the best of our knowledge. This paper consists in an experimental characterization of low Reynolds number, oscillating grid generated, near-surface turbulence in shear-thinning dilute polymer solutions, in the surface-influenced and in the viscous sublayers. The energy transfer mechanism, known in the water case, is evidenced in dilute polymer solutions. A horizontal damping mechanism, similar to the one introduced by surfactants, is evidenced. The evolution of the viscous sublayer depth can be explained by both viscous and shear-thinning effects, and it appears that a critical polymer concentration may exist within the dilute regime.

Type: Article
Title: Oscillating grid generating turbulence near gas-liquid interfaces in shear-thinning dilute polymer solutions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/physrevfluids.5.033301
Publisher version: https://doi.org/10.1103/physrevfluids.5.033301
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.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10094395
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