Convection thermique turbulente en cellule de Rayleigh-Bénard cryogénique

Abstract : This dissertation examines turbulent thermal convection in various Rayleigh-Bénard cells, using gaseous and liquid helium. One of the specificities of this work is a cryogenics implementation, in order to benefit from an optimal experimental environment in terms of thermal control as well as in terms of range of variation of the control parameters : the Prandtl and Rayleigh numbers. Particularly, the latest is explored over more than 11 decades. Three main contributions emerge from this study. Firstly, we evidence a meaningful effect of side wall conduction. Neglected in previous studies, this effet is explored experimentally and a model is derived. Incoherences which appeared in reference publications are explained. In addition, a new analysis of the literature -through this modeling- points out that the Nusselt (Nu) number depends on the Rayleigh number according to a power law which exponent is higher than 0,3, rather than 2/7 for exemple. The second contribution pertains to Prandtl number influence over one decade and an half (0,7
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Contributor : Philippe-E. Roche <>
Submitted on : Wednesday, October 30, 2002 - 5:08:35 PM
Last modification on : Thursday, October 18, 2018 - 12:18:05 PM
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Philippe-Emmanuel Roche. Convection thermique turbulente en cellule de Rayleigh-Bénard cryogénique. Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00001894⟩

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