Turbulent rotating convection at high Rayleigh and Taylor numbers

J. J. Niemela, S. Babuin, K. R. Sreenivasan

Research output: Contribution to journalArticlepeer-review

Abstract

We report heat transport measurements in a cylindrical convection apparatus rotating about the vertical axis. The aspect ratio was 1/2. The working fluid was cryogenic helium gas and the following parameter ranges applied: the Rayleigh number, Ra, varied in the range 1011 < Ra < 4.3 1015, the Taylor number, Ta, varied in the range 1011 < Ta < 3 1015, the convective Rossby number, Ro, varied in the range 0.4 < Ro < 1.6 and the Prandtl number, Pr, varied in the range 0.7 < Pr < 5.9. Boussinesq conditions applied quite closely. The heat transport for steady rotation, under all conditions of the present experiments, was smaller than that for the non-rotating case. When the rotation rate varied periodically in time, a sharp transition to a state of significantly enhanced heat transport was observed for modulation Taylor numbers Ta *<1014, where Ta* is based on the peak value of the modulation angular velocity.

Original languageEnglish (US)
Pages (from-to)509-522
Number of pages14
JournalJournal of Fluid Mechanics
Volume649
DOIs
StatePublished - Apr 25 2010

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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