An experimental study of Rayleigh-Bénard convection in helium gas at roughly 5 K is performed in a cell with aspect ratio 1. Data are analysed in a ‘hard turbulence’ region (4 × 10 7 < Ra < 6 × 10 12 ) in which the Prandtl number remains between 0.65 and 1.5. The main observation is a simple scaling...
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