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Resonances and instabilities in a tilted rotating annulus

Published online by Cambridge University Press:  20 October 2023

S. Scollo*
Affiliation:
Aix Marseille Université, CNRS, Centrale Marseille, IRPHE, 13384 Marseille, France
C. Nobili
Affiliation:
Aix Marseille Université, CNRS, Centrale Marseille, IRPHE, 13384 Marseille, France
E. Villermaux
Affiliation:
Aix Marseille Université, CNRS, Centrale Marseille, IRPHE, 13384 Marseille, France Institut Universitaire de France, 75005 Paris, France
P. Meunier
Affiliation:
Aix Marseille Université, CNRS, Centrale Marseille, IRPHE, 13384 Marseille, France
*
Email address for correspondence: scollo@irphe.univ-mrs.fr

Abstract

The flow inside a rotating annulus tilted with respect to gravity is characterized experimentally and theoretically. As in the case of a tilted rotating cylinder the flow is forced by the free surface, maintained flat by gravity. It leads to resonances of global inertial modes (Kelvin modes) when the height of fluid is a multiple of half the wavelength of the mode. The divergence of the mode is saturated by viscous effects at the resonance. The maximum amplitude scales as the Ekman number to the power $-1/2$ when surface Ekman pumping is dominant, and to the power $-1$ when volumic damping is dominant. An analytical prediction is given with no fitting parameter, in excellent agreement with experimental results. At lower Ekman numbers, the flow destabilizes with respect to a triadic resonance instability, as already observed by Xu & Harlander (Phys. Rev. Fluids, 2020). We provide here a linear stability analysis leading to the viscous threshold of the instability for small tilt angles. For large tilt angles, a centrifugal instability is observed due to the acceleration of the flow by the inner cylinder. Finally, the features of the turbulent flow and its mixing efficiency are characterized experimentally. We underline the potential interest of this configuration for bioreactors.

Type
JFM Papers
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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