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In a low temperature He gas Rayleigh-B\'enard experiment, Rayleigh numbers from 10³ to more than 10¹⁴ are explored. Local velocity is estimated through the time lag between two closeby temperature probes. This allows characterizing of the high Rayleigh regime (Ra>10¹¹) as a fully turbulent one, possibly corresponding to the asymptotic regime predicted by R. Kraichnan [Phys. Fluids 5, 1374 (1962)].
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Chavanne et al. (1997) studied this question.
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