Flow regimes in a vertical Taylor-Couette system with a radial thermal gradient

A rich variety of flow regimes in a Newtonian fluid inside a vertical large-aspect ratio and a wide-gap Taylor-Couette system with a radial temperature gradient has been determined in experiments and in direct numerical simulations (DNSs). Compared to previous experiments and numerical studies, a wi...

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Bibliographic Details
Published in:Physics of fluids (1994) 2015-09, Vol.27 (9)
Main Authors: Guillerm, R., Kang, C., Savaro, C., Lepiller, V., Prigent, A., Yang, K.-S., Mutabazi, I.
Format: Article
Language:English
Subjects:
Aspect ratio
Computational fluid dynamics
Computer simulation
Experiments
Fluid dynamics
Fluid flow
Fluid mechanics
Grashof number
Mechanics
Newtonian fluids
Physics
Rotation
Stability
Stability analysis
State (computer science)
Temperature gradients
Vortices
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Summary:A rich variety of flow regimes in a Newtonian fluid inside a vertical large-aspect ratio and a wide-gap Taylor-Couette system with a radial temperature gradient has been determined in experiments and in direct numerical simulations (DNSs). Compared to previous experiments and numerical studies, a wider range of temperature differences (i.e., of the Grashof number Gr) and of the rotation rate (the Taylor number Ta) has been covered. The combined effect of rotation and of the radial temperature gradient is the occurrence of helicoidal vortices or modulated waves at the onset. Stationary axisymmetric vortices are found for very weak temperature differences. A good agreement was found for critical states between results from experiments, linear stability analysis, and DNS. Higher instability modes have been determined for a wide range of parameters and a state diagram of observable flow regimes has been established in the plane spanned by Gr and Ta. Some higher states observed in experiments were retrieved in DNS.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4930588