Transition to the ultimate state of turbulent Rayleigh-Bénard convection.

  title={Transition to the ultimate state of turbulent Rayleigh-B{\'e}nard convection.},
  author={Xiaozhou He and Denis Funfschilling and Holger Nobach and Eberhard Bodenschatz and Guenter Ahlers},
  journal={Physical review letters},
  volume={108 2},
Measurements of the Nusselt number Nu and of a Reynolds number Re(eff) for Rayleigh-Bénard convection (RBC) over the Rayleigh-number range 10(12)≲Ra≲10(15) and for Prandtl numbers Pr near 0.8 are presented. The aspect ratio Γ≡D/L of a cylindrical sample was 0.50. For Ra≲10(13) the data yielded Nu∝Ra(γ(eff)) with γ(eff)≃0.31 and Re(eff)∝Ra(ζ(eff)) with ζ(eff)≃0.43, consistent with classical turbulent RBC. After a transition region for 10(13)≲Ra≲5×10(14), where multistability occurred, we found… CONTINUE READING
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