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.
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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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