Abstract
Numerical and experimental data for the heat transfer as function of the Rossby number Ro in rotating Rayleigh-Benard are presented for Pr = 4:38 and up to Ra = 4:52 109. The aspect ratio is varied between \Gamma = 0:5 and \Gamma = 2:0. Without rotation, where the aspect ratio influences the global flow structure, we see a small aspect-ratio dependence in the Nusselt number. For stronger rotation, i.e. 1=Ro \gg 1=Roc, the heat transport becomes independent of the aspect-ratio. We interpret this finding as follows: In the rotating regime the heat is mainly transported by vertically-aligned vortices. Since these vortices are local, the aspect ratio has a negligible eect on the heat transport in the rotating regime. Indeed, an analysis of the vortex statistics shows that the fraction of the horizontal area that is covered by vortices is aspect-ratio independent when 1=Ro 1=Roc. In agreement with the results of Weiss & Ahlers (2011) we find a vortex-depleted area close to the sidewall. Here, we show that there is also an area with enhanced vortex concentration next to the vortex-depleted edge region and that the absolute widths of both regions are independent of the aspect ratio. This proceeding is a summary of Stevens et al. (2011).
Original language | Undefined |
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Title of host publication | Proceedings of the 13th European Turbulence Conference (ETC13) |
Place of Publication | Bristol |
Publisher | Institute of Physics |
Pages | 082009 |
Number of pages | 9 |
DOIs | |
Publication status | Published - 2011 |
Event | 13th European Turbulence Conference, ETC 2011 - Warsaw, Poland Duration: 12 Sept 2011 → 15 Sept 2011 Conference number: 13 |
Publication series
Name | Journal of Physics: Conference Series |
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Publisher | Institute of Physics |
Number | 8 |
Volume | 318 |
ISSN (Print) | 1742-6588 |
Conference
Conference | 13th European Turbulence Conference, ETC 2011 |
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Abbreviated title | ETC13 |
Country/Territory | Poland |
City | Warsaw |
Period | 12/09/11 → 15/09/11 |
Keywords
- METIS-282025
- EWI-21198
- EC Grant Agreement nr.: FP7/222919
- IR-79478