Heat transport by turbulent Rayleigh–Bénard convection for Pr ≃ 0.8 and 3 × 1012 ≲ Ra ≲ 1015: aspect ratio Γ = 0.50

We report on the experimental results for heat-transport measure- ments, in the form of the Nusselt number Nu, by turbulent Rayleigh-B´ enard convection (RBC) in a cylindrical sample of aspect ratio 0 D/L = 0.50 (D = 1.12m is the diameter and L = 2.24m the height). The measurements were made using sulfur hexafluoride at pressures up to 19bar as the fluid. They are for the Rayleigh-number range 3◊10 12 . Ra . 10 15 and for Prandtl numbers Pr between 0.79 and 0.86. For Ra < Ra 1 ' 1.4◊10 13 we find Nu = N0 Ra eff with eff = 0.312±0.002, which is consistent with classical turbulent RBC in a system with laminar boundary layers below the top and above the bottom

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