Reynolds numbers and the elliptic approximation near the ultimate state of turbulent Rayleigh–Bénard convection
نویسندگان
چکیده
منابع مشابه
Transition to the ultimate state of turbulent Rayleigh-Bénard convection.
Measurements of the Nusselt number Nu and of a Reynolds number Re(eff) for Rayleigh-Bénard convection (RBC) over the Rayleigh-number range 10(12)≲Ra≲10(15) and for Prandtl numbers Pr near 0.8 are presented. The aspect ratio Γ≡D/L of a cylindrical sample was 0.50. For Ra≲10(13) the data yielded Nu∝Ra(γ(eff)) with γ(eff)≃0.31 and Re(eff)∝Ra(ζ(eff)) with ζ(eff)≃0.43, consistent with classical turb...
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Guenter Ahlers,1,2,* Eberhard Bodenschatz,2,3,4,* and Xiaozhou He5,* 1Department of Physics, University of California, Santa Barbara, California 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 o...
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Paul B. J. Hoefnagels,1,2 Ping Wei,3 Daniela Narezo Guzman,1,2 Chao Sun,1,4 Detlef Lohse,1,5 and Guenter Ahlers2 1Physics of Fluids Group, Department of Science and Technology, J.M. Burgers Center for Fluid Dynamics, Mesa+-Institute, and Max Planck Center Twente, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands 2Department of Physics, University of California, Santa Barbara...
متن کاملReynolds numbers of the large-scale flow in turbulent Rayleigh-Bénard convection
We measured Reynolds numbers Re of turbulent Rayleigh-Bénard convection over the Rayleighnumber range 2×10 <∼ R <∼ 10 11 and Prandtl-number range 3.3 <∼ σ <∼ 29 for cylindrical samples of aspect ratio Γ = 1. For R <∼ Rc ≃ 3× 10 9 we found Re ∼ R βeff with βeff ≃ 0.46 < 1/2. Here both the σand R-dependences are quantitatively consistent with the Grossmann-Lohse (GL) prediction. For R > Rc we fou...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2015
ISSN: 1367-2630
DOI: 10.1088/1367-2630/17/6/063028