Abstract
In a low temperature He gas Rayleigh-B\'enard experiment, Rayleigh numbers from ${10}^{3}$ to more than ${10}^{14}$ are explored. Local velocity is estimated through the time lag between two closeby temperature probes. This allows characterizing of the high Rayleigh regime $(\mathrm{Ra}>{10}^{11})$ as a fully turbulent one, possibly corresponding to the asymptotic regime predicted by R. Kraichnan [Phys. Fluids 5, 1374 (1962)].
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