Abstract
We report measurements of the temporal fluctuations of the heat flux in Rayleigh-Bénard turbulent convection in various fluids and geometries. We observe that the rms fluctuations of the heat flux increase nearly proportionally to the temperature difference ΔT. The ratio of the rms fluctuations of the heat flux to their mean display a power law, Ra−γ on two decades in Rayleigh number (2·107 < Ra < 3·109). We discuss this law as well as the non-Gaussian character of the probability density function of the heat flux.
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