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Exploration by Shake-the-Box technique of the 3D perturbation induced by a bubble rising in a thin-gap cell

Pavlov, Lucas and Cazin, Sébastien and Ern, Patricia and Roig, Véronique Exploration by Shake-the-Box technique of the 3D perturbation induced by a bubble rising in a thin-gap cell. (2021) Experiments in Fluids, 62. 22 (2021). ISSN 0723-4864

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Official URL: https://doi.org/10.1007/s00348-020-03117-z

Abstract

From Lagrangian measurements using the Shake-the-Box technique (Schanz et al. in Exp Fluids 57(5):70, 2016) we investigate the velocity field about a single bubble rising in a thin-gap cell and we discuss it in an Eulerian framework of analysis. The gap thickness is equal to 2.85 mm and the bubble-induced perturbation extends over at least 10 cm in the plane of the cell, so that a very flat volume of observation is required. At first validation of the technique is provided during an emptying of the cell. It allows to fix all methodological parameters to ensure accurate measurements and, indirectly, to measure precisely the gap thickness. Then, the velocity field about a confined high-Reynolds number bubble is investigated. This velocity field is discussed in comparison with a previous description obtained by two-dimensional Particle Image Velocimetry (2D2C-PIV) with volume enlightening of the whole cell (Roig et al. in J Fluid Mech 707:444–466, 2012; Filella et al. in J Fluid Mech 778:60–88, 2015). Velocity is first averaged over the gap and compared to the 2D2C-PIV measurement obtained from tomoreconstructed and projected frontal images. Then a 3D description of the velocity field is presented. It allows to discuss the quality and limitations of the 2D description of the wake with a velocity field integrated across the cell. In particular, the 3D description obtained from STB shows that the flow becomes mainly parallel to the cell plates at a distance of approximately one bubble diameter and that the wake is organised in slices parallel to the plates moving with their own dynamics that may vary their relative in-plane orientations, but all follow the general exponential viscous law of decay.

Item Type:Article
Additional Information:© The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature 2021
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universidad de Buenos Aires (ARGENTINA)
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Funders:
Toulouse INP (SMI funding)
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Deposited On:08 Jul 2021 12:03

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