Key points are not available for this paper at this time.
SF₆ in the vicinity of its critical point was used to study turbulent convection up to exceptionally high Rayleigh numbers, Ra (up to 510^14) and to verify for the first time the generalized scaling laws for the heat transport and the large scale circulation velocity as a function of Ra and the Prandtl number, Pr, in a very wide range of these parameters. Both scaling laws obtained are consistent with theoretical predictions by Shraiman and Siggia Phys. Rev. A 42, 3650 (1990).
Ashkenazi et al. (Mon,) studied this question.