Spectra and statistics of velocity and temperature fluctuations in turbulent convection

Details Spectra and statistics of velocity and temperature fluctuations in turbulent convection Spectra and statistics of velocity and temperature fluctuations in turbulent convection

1999-06-09

arxiv.org/abs/chao-dyn/9906015v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.83.4760

Direct measurements of the velocity in turbulent convection of $SF_6$ 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 $10^5$.

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