Transition on local temperature fluctuations in highly turbulent convection - Archive ouverte HAL
Article Dans Une Revue EPL - Europhysics Letters Année : 2009

Transition on local temperature fluctuations in highly turbulent convection

Résumé

In 1997, a new turbulent regime has been observed in a Rayleigh-B'enard cell and has been interpreted as the "Ultimate Regime" of convection. This observation was based on global heat transfer measurements at very high Rayleigh numbers (Ra). Using a set-up similar to the one used in 1997, we examine the signature of this regime from within the flow itself. A systematic study of probe-size corrections shows that the earlier local temperature measurements within the flow were altered by an excessive size of thermometer, but not according to a theoretical model proposed in the literature. Using a probe one order of magnitude smaller than the one used previously, we find evidence that the transition to the very-high-Ra regime is indeed accompanied with a clear change in the statistics of temperature fluctuations in the flow
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Dates et versions

hal-00384943 , version 1 (17-05-2009)

Identifiants

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Frédéric Gauthier, Julien Salort, Olivier Bourgeois, Jean-Luc Garden, Ronald Du Puits, et al.. Transition on local temperature fluctuations in highly turbulent convection. EPL - Europhysics Letters, 2009, 87, pp.44006. ⟨10.1209/0295-5075/87/44006⟩. ⟨hal-00384943⟩

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