Boundary layers in rotating weakly turbulent Rayleigh-Bénard convection

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Abstract

The effect of rotation on the boundary layers (BLs) in a Rayleigh–Bénard system at a relatively low Rayleigh number, i.e., Ra = 4×10^7, is studied for different Pr by direct numerical simulations and the results are compared with laminar BL theory. In this regime, we find a smooth onset of the heat transfer enhancement as function of increasing rotation rate. We study this regime in detail and introduce a model based on the Grossmann–Lohse theory to describe the heat transfer enhancement as function of the rotation rate for this relatively low Ra number regime and weak background rotation Ro≳1. The smooth onset of heat transfer enhancement observed here is in contrast to the sharp onset observed at larger Ra≳10^8 by Stevens et al. [Phys. Rev. Lett. 103, 024503 (2009)] , although only a small shift in the Ra-Ro-Pr phase space is involved.
Original languageUndefined
Pages (from-to)085103
Number of pages13
JournalPhysics of fluids
Volume22
Issue number8
DOIs
Publication statusPublished - 2010

Keywords

  • rotational flow
  • EWI-19482
  • Flow simulation
  • Convection
  • Boundary layer turbulence
  • Laminar flow
  • METIS-267589
  • IR-75846
  • Rayleigh-Benard instability

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