Transitions in heat transport by turbulent convection at Rayleigh numbers up to 1015

Details Transitions in heat transport by turbulent convection at Rayleigh numbers up to 1015 Transitions in heat transport by turbulent convection at Rayleigh numbers up to 1015

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11l3001a&link_type=abstract

New Journal of Physics, Volume 11, Issue 12, pp. 123001 (2009).

Physics

12

Scientific paper

We describe a pressure vessel for conducting experiments in helium (He), air, nitrogen (N2) or sulfur hexafluoride (SF6) under pressures of up to 19 bars, and facilities for the study of Rayleigh-Bénard convection inside this pressure vessel. The convection cells, known as the high pressure convection facilities (HPCFs), can have interior heights up to L=2.3 m and diameters up to D=1.2 m. Measurements of the Nusselt number Nu for Rayleigh numbers Ra up to Ra*=4×1013 and a Prandtl number Prsime0.8 gave Nu~Raγeff with γeffsime0.308. At Ra* there was a sharp transition to a new regime. The Nusselt number was continuous at Ra*, but the exponent characterizing its dependence on Ra changed suddenly to γeff=0.25. Near Ra=Ra**sime3×1014, there was a further change in the Ra-dependence of Nu. A new state with γeffsime0.17 evolved and there was bistability of the γeff=0.25 and the γeff=0.17 branches.

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