Logarithmic temperature profiles in the ultimate regime of thermal convection
نویسندگان
چکیده
منابع مشابه
Temperature fluctuations in the Ultimate Regime of Convection
A new regime of turbulent convection has been reported nearly one decade ago, based on global heat transfer measurements at very high Rayleigh numbers. We examine the signature of this “Ultimate Regime” from within the flow itself. A systematic study of probe-size corrections shows that the earlier temperature measurements within the flow were altered by an excessive size of thermometer, but no...
متن کاملTemperature structure functions in the Bolgiano regime of thermal convection.
We measure temperature fluctuations in the Rayleigh-Bénard apparatus, which is a closed cylindrical container with the bottom wall heated and the top wall cooled. The aspect ratio, which is the diameter-to-height ratio of the apparatus, is unity. The Rayleigh number is 1.5 x 10(11). The working fluid is cryogenic helium gas. We compute temperature structure functions up to order 16, and use ext...
متن کاملLogarithmic temperature profiles of turbulent Rayleigh–Bénard convection in the classical and ultimate state for a Prandtl number of 0.8
Guenter Ahlers1,2,†,‡, Eberhard Bodenschatz2,3,4,‡ and Xiaozhou He2,‡ 1Department of Physics, University of California, Santa Barbara, CA 93106, USA 2Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany 3Institute for Nonlinear Dynamics, University of Göttingen, 37077 Göttingen, Germany 4Laboratory of Atomic and Solid-State Physics, and Sibley School of Mech...
متن کاملLogarithmic temperature profiles in turbulent Rayleigh-Bénard convection.
We report results for the temperature profiles of turbulent Rayleigh-Bénard convection (RBC) in the interior of a cylindrical sample of aspect ratio Γ≡D/L=0.50 (D and L are the diameter and height, respectively). Both in the classical and in the ultimate state of RBC we find that the temperature varies as A×ln(z/L)+B, where z is the distance from the bottom or top plate. In the classical state,...
متن کاملUltimate state of thermal convection.
The ultimate regime of thermal convection, the so-called Kraichnan regime [R. H. Kraichnan, Phys. Fluids 5, 1374 (1962)]], hitherto has been elusive. Here numerical evidence for that regime is presented by performing simulations of the bulk of turbulence only, eliminating the thermal and kinetic boundary layers and replacing them with periodic boundary conditions.
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2012
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.4767540