Quantitative visualization of swirl and cloud bubbles in Taylor–Couette flow

Article dans une revue avec comité de lecture
Auteur
VAN RUYMBEKE, Bruno
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
MURAI, Yuichi
304963 Hokkaido University [Sapporo, Japan]
TASAKA, Yuji
304963 Hokkaido University [Sapporo, Japan]
OISHI, Yoshihiko
304963 Hokkaido University [Sapporo, Japan]
GABILLET, Céline
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
COLIN, Catherine
690 Institut de mécanique des fluides de Toulouse [IMFT]
LATRACHE, Noureddine
300314 Université de Brest [UBO]

URI
http://hdl.handle.net/10985/11324
DOI
10.1007/s12650-016-0391-5
Date
2016
Journal
Journal of Visualization

Résumé

We develop a novel method to study the gas phase features in a bubbly Taylor–Couette flow when bubbles are arranged as elevated toroidal strings. The flow is recorded in the front view plane with a highspeed camera for a Reynolds number of 1500 and a global void fraction of 0.14 %. An image processing algorithm is developed to discriminate bubbles accumulated in clouds near the inner cylinder (cloud bubbles) from bubbles trapped in the bulk flow by vortices (swirl bubbles). The analysis of the preferential positions, azimuthal velocities, and equivalent void fraction of clouds and swirl bubbles separately provides a new insight into the dynamics of the bubble’s entrapment.

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