Spectra and statistics of velocity and temperature fluctuations in turbulent convection

Abstract

Direct measurements of the velocity in turbulent convection of $S{F}_6$ near its gas-liquid critical point by light scattering on the critical density fluctuations were conducted. The temperature, velocity and cross frequency power spectra in a wide range of the Rayleigh and Prandtl numbers show scaling behaviour with indices, which are rather close to the Bolgiano-Obukhov scaling in the wavenumber domain. The statistics of the velocity fluctuations remains Gaussian up to the Reynolds numbers $10^5$.

4 pages, 4 figures

References in corpus (1)

• High Rayleigh number turbulent convection in a gas near the gas-liquid critical point

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