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Boundary Zonal Flow in Rotating Turbulent Rayleigh-Bénard Convection
Xuan Zhang, Dennis P. M. van Gils, Susanne Horn +7
For rapidly rotating turbulent Rayleigh--Bénard convection in a slender cylindrical cell, experiments and direct numerical simulations reveal a boundary zonal flow (BZF) that repla…
Azimuthal diffusion of the large-scale-circulation plane, and absence of significant non-Boussinesq effects, in turbulent convection near the ultimate-state transition
Xiaozhou He, Eberhard Bodenschatz, Guenter Ahlers
We present measurements of the orientation and temperature amplitude of the large-scale circulation in a cylindrical sample of turbulent Rayleigh-Benard convection (RBC)…
Logarithmic Spatial Variations and Universal Power Spectra of Temperature Fluctuations in Turbulent Rayleigh-Bénard Convection
Xiaozhou He, Dennis P. M. van Gils, Eberhard Bodenschatz +1
We report measurements of the temperature variance and frequency power spectrum ( is the distance from the sample bottom and the radial coordinate) in…
Logarithmic temperature profiles of turbulent Rayleigh-Bénard convection in the classical and ultimate state for a Prandtl number of 0.8
Guenter Ahlers, Eberhard Bodenschatz, Xiaozhou He
We report on experimental determinations of the temperature field in the interior (bulk) of turbulent Rayleigh-Benard convection for a cylindrical sample with aspect ratio (diamete…
Effect of tilting on turbulent convection: Cylindrical samples with aspect ratio
Stephan Weiss, Guenter Ahlers
We report measurements of properties of turbulent thermal convection of a fluid with a Prandtl number $\Pra=4.38$ in a cylindrical cell with an aspect ratio . The rotationa…
Heat transport by turbulent Rayleigh-Bénard convection for $\Pra\ \simeq 0.8$ and $4\times 10^{11} \alt \Ra\ \alt 2\times10^{14}$: Ultimate-state transition for aspect ratio
Xiaozhou He, Denis Funfschilling, Eberhard Bodenschatz +1
We report experimental results for heat-transport measurements by turbulent Rayleigh-Bénard convection in a cylindrical sample of aspect ratio ( m is…
Heat transport by turbulent Rayleigh-Bénard convection for $\Pra\ \simeq 0.8$ and $3\times 10^{12} \alt \Ra\ \alt 10^{15}$: Aspect ratio
Guenter Ahlers, Xiaozhou He, Denis Funfschilling +1
We report experimental results for heat-transport measurements, in the form of the Nusselt number \Nu, by turbulent Rayleigh-Bénard convection in a cylindrical sample of aspect rat…
Logarithmic temperature profiles in turbulent Rayleigh-Bénard convection
Guenter Ahlers, Eberhard Bodenschatz, Denis Funfschilling +5
We report results for the temperature profiles of turbulent Rayleigh-Bénard convection (RBC) in the interior of a cylindrical sample of aspect ratio ( and $…
Finite-size effects lead to supercritical bifurcations in turbulent rotating Rayleigh-Bénard convection
Stephan Weiss, Richard J. A. M. Stevens, Jin-Qiang Zhong +3
In turbulent thermal convection in cylindrical samples of aspect ratio Γ= D/L (D is the diameter and L the height) the Nusselt number Nu is enhanced when the sample is rotated abou…
Effect of a polymer additive on heat transport in turbulent Rayleigh-Bénard convection
Guenter Ahlers, Alexei Nikolaenko
Measurements of heat transport, as expressed by the Nusselt number , are reported for turbulent Rayleigh-Bénard convection of water containing up to 120 ppm by weight of poly-[…
Search for the "ultimate state" in turbulent Rayleigh-Bénard convection
Denis Funfschilling, Eberhard Bodenschatz, Guenter Ahlers
Measurements of the Nusselt number and of temperature variations in the bulk fluid are reported for turbulent Rayleigh-Bénard convection of a cylindrical sample. They c…
Azimuthal asymmetries of the large-scale circulation in turbulent Rayleigh-Benard convection
Eric Brown, Guenter Ahlers
Previously we published a dynamical model (E. Brown and G. Ahlers, Phys. Fluids, 20, 075101 (2008)) for the large-scale-circulation (LSC) dynamics of Rayleigh-Benard convection in…
The cause of oscillations of the large-scale circulation of turbulent Rayleigh-B{é}nard convection
Eric Brown, Guenter Ahlers
In agreement with a recent experimental discovery by Xia et. al. (2009), we also find a sloshing mode in experiments on the large-scale circulation (LSC) of turbulent Rayleigh-Bena…
Transitions between turbulent states in rotating Rayleigh-Benard convection
Richard J. A. M. Stevens, Jin-Qiang Zhong, Herman J. H. Clercx +2
Weakly-rotating turbulent Rayleigh-Benard convection was studied experimentally and numerically. With increasing rotation and large enough Rayleigh number an abrupt transition from…
Enhanced heat transport by turbulent two-phase Rayleigh-Bénard convection
Jin-Qiang Zhong, Denis Funfschilling, Guenter Ahlers
We report measurements of turbulent heat-transport in samples of ethane (CH) heated from below while the applied temperature difference straddled the liquid-vapor co-e…
Large scale dynamics in turbulent Rayleigh-Benard convection
Guenter Ahlers, Siegfried Grossmann, Detlef Lohse
The progress in our understanding of several aspects of turbulent Rayleigh-Benard convection is reviewed. The focus is on the question of how the Nusselt number and the Reynolds nu…
Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent rotating Rayleigh-Benard convection
Jin-Qiang Zhong, Richard J. A. M. Stevens, Herman J. H. Clercx +3
Experimental and numerical data for the heat transfer as a function of the Rayleigh-, Prandtl-, and Rossby numbers in turbulent rotating Rayleigh-Benard convection are presented. F…
A model of diffusion in a potential well for the dynamics of the large-scale circulation in turbulent Rayleigh-Benard convection
Eric Brown, Guenter Ahlers
Experimental measurements of properties of the large-scale circulation (LSC) in turbulent convection of a fluid heated from below in a cylindrical container of aspect ratio one are…
Non-Oberbeck-Boussinesq effects in turbulent thermal convection in ethane close to the critical point
Guenter Ahlers, Enrico Calzavarini, Francisco Fontenele Araujo +4
As shown in earlier work (Ahlers et al., J. Fluid Mech. 569, p.409 (2006)), non-Oberbeck Boussinesq (NOB) corrections to the center temperature in turbulent Rayleigh-Benard convect…
A model for the large-scale circulation in turbulent Rayleigh-Benard convection
Eric Brown, Guenter Ahlers
A model for the large-scale circulation (LSC) dynamics of turbulent Rayleigh-Benard convection is presented. It consists of two stochastic ordinary differential equations motivated…
Effect of the Earth's Coriolis force on the large-scale circulation of turbulent Rayleigh-Benard convection
Eric Brown, Guenter Ahlers
We present measurements of the large-scale circulation (LSC) of turbulent Rayleigh-Benard convection in water-filled cylindrical samples of heights equal to their diameters. The or…
Rotations and cessations of the large-scale circulation in turbulent Rayleigh-Benard convection
Eric Brown, Guenter Ahlers
We present a broad range of measurements of the angular orientation theta_0(t) of the large-scale circulation (LSC) of turbulent Rayleigh-Benard convection as a function of time. W…
Heat transport in turbulent Rayleigh-Benard convection: Effect of finite top- and bottom-plate conductivity
Eric Brown, Alexei Nikolaenko, Denis Funfschilling +1
We describe three apparatus, known as the large, medium, and small apparatus, used for high-precision measurements of the Nusselt number N as a function of the Rayleigh number R fo…
Reynolds numbers of the large-scale flow in turbulent Rayleigh-Benard Convection
Guenter Ahlers, Eric Brown, Denis Funfschilling +1
We measured Reynolds numbers R_e of turbulent Rayleigh-Benard convection over the Rayleigh-number range 2 times 10^8 < R < 10^11 and Prandtl-number range 3.3 < sigma < 29 for cylin…