Lacassagne, T;
Simoëns, S;
EL Hajem, M;
Champagne, J;
(2020)
POD analysis of oscillating grid turbulence in water and shear thinning polymer solution.
AIChE Journal
, 67
(1)
10.1002/aic.17044.
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Abstract
Oscillating grids are frequently used with water and Newtonian fluids to generate controlled turbulence and mixing. Yet, their use with shear thinning fluids still requires experimental characterization. Proper orthogonal decomposition (POD) is applied to PIV measurements of the flow generated by an oscillating grid in water and a shear thinning dilute polymer solution (DPS) of xanthan gum. The aims are to investigate the ability of POD to isolate periodic flow structures, and to use it to describe the effects of the shear thinning property. A dominance of the low order POD modes is evidenced in DPS. The methods applied in blade stirred tanks to identify oscillatory motion fail here. However, a strong mode coupling in the grid swept region is observed, determined by the working fluid and by an underlying chaotic nature of the flow. Possibilities of reconstructing turbulence properties using high order modes are discussed.
| Type: | Article |
|---|---|
| Title: | POD analysis of oscillating grid turbulence in water and shear thinning polymer solution |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/aic.17044 |
| Publisher version: | http://dx.doi.org/10.1002/aic.17044 |
| Language: | English |
| Additional information: | © 2020 The Authors. AIChE Journal published by Wiley Periodicals LLC on behalf of American Institute of Chemical Engineers. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | oscillating grid turbulence, PIV, POD, shear-thinning |
| 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-pp.ucl.ac.uk/id/eprint/10124173 |
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