Logarithmic mean temperature profiles in turbulent Rayleigh-Bénard convection
نویسندگان
چکیده
منابع مشابه
Logarithmic 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 کاملMean temperature profiles in turbulent Rayleigh–Bénard convection of water
We report an investigation of temperature profiles in turbulent Rayleigh–Bénard convection of water based on direct numerical simulations (DNS) for a cylindrical cell with unit aspect ratio for the same Prandtl number Pr and similar Rayleigh numbers Ra as used in recent high-precision measurements by Funfschilling et al. (J. Fluid Mech., vol. 536, 2005, p. 145). The Nusselt numbers Nu computed ...
متن کاملTemperature statistics in turbulent Rayleigh–Bénard convection
Rayleigh–Bénard (RB) convection in the turbulent regime is studied using statistical methods. Exact evolution equations for the probability density function of temperature and velocity are derived from first principles within the framework of the Lundgren–Monin–Novikov hierarchy known from homogeneous isotropic turbulence. The unclosed terms arising in the form of conditional averages are estim...
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 the bulk of turbulent Rayleigh–Bénard convection for a Prandtl number of 12.3
We report measurements of logarithmic temperature profiles Θ(z, r)=A(r)× ln(z/L)+ B(r) in the bulk of turbulent Rayleigh–Bénard convection (here Θ is a scaled and timeaveraged local temperature in the fluid, z is the vertical and r the radial position, and L is the sample height). Two samples had aspect ratios Γ ≡D/L= 1.00 and 0.50 (where D = 190 mm is the diameter). The fluid was a fluorocarbo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: SCIENTIA SINICA Physica, Mechanica & Astronomica
سال: 2017
ISSN: 1674-7275
DOI: 10.1360/sspma2016-00427