Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent rotating Rayleigh-Bénard convection

Jin-Qiang Zhong, Richard J.A.M. Stevens, H.J.H. Clercx, Roberto Verzicco, Detlef Lohse, Günter Ahlers

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Abstract

Experimental and numerical data for the heat transfer as a function of the Rayleigh, Prandtl, and Rossby numbers in turbulent rotating Rayleigh-Bénard convection are presented. For relatively small Ra $\approx 10^8$ and large Pr modest rotation can enhance the heat transfer by up to 30%. At larger Ra there is less heat-transfer enhancement, and at small Pr≲0.7 there is no heat-transfer enhancement at all. We suggest that the small-Pr behavior is due to the breakdown of the heat-transfer-enhancing Ekman pumping because of larger thermal diffusion.
Original languageEnglish
Pages (from-to)044502
Number of pages4
JournalPhysical review letters
Volume102
Issue number4
DOIs
Publication statusPublished - Jan 2009

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Keywords

  • EWI-17333
  • IR-69755
  • METIS-255174

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