Volume 62, Number 6, June 2003
|Page(s)||822 - 828|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 June 2003|
Statistical properties of the fluctuations of the heat transfer in turbulent convection
Laboratoire de Physique Statistique, Ecole Normale Supérieure, UMR 8550 24 rue Lhomond, 75 005 Paris, France
Accepted: 15 April 2003
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 . The ratio of the rms fluctuations of the heat flux to their mean display a power law, on two decades in Rayleigh number (). We discuss this law as well as the non-Gaussian character of the probability density function of the heat flux.
PACS: 47.27.-i – Turbulent flows, convection, and heat transfer
© EDP Sciences, 2003
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