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Étude expérimentale de l'effet d'un gradient radial de température sur les instabilités du système de Couette-Taylor

Abstract : We performed an experimental investigation of the stability of the flow confined between two coaxial cylinders and produced by two distinct actions:the rotation of the inner cylinder and the natural convection generated by a radial temperature gradient. In other word, thermal effects are added to the Couette-Taylor system, which is a good prototype for the study of centrifugal instabilities. We studied the flow pattern which are revealed by Kalliroscope and performed temperature and velocity fields measurement using thermo-chromic liquids crystals. With the inner cylinder at rest, we showed that a vertical temperature gradient is produced when the radial temperature gradient is large enough. This vertical gradient affects the threshold of the first instability with inner cylinder rotation. We observed a slight discrepancy between our measurements and the threshold calculated with a linear stability analysis for the largest applied temperature gradients. We studied especially the modulated wave pattern arising from the destabilization of the base state for large temperature gradients. A very small increase of the inner cylinder rotation destabilizes this pattern and a solitary localized wave much more intense than the modulated spiral appears. We also studied the high rotation rates domain and found that the radial temperature gradient still affects the flow even if the temperature gradient is confined in thermal boundary layers due to the convection.
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Clément Savaro. Étude expérimentale de l'effet d'un gradient radial de température sur les instabilités du système de Couette-Taylor. Mécanique des fluides [physics.class-ph]. Université du Havre, 2014. Français. ⟨tel-01794201⟩

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