Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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 languageUndefined
Title of host publicationProceedings of the 13th European Turbulence Conference (ETC13)
Place of PublicationBristol
PublisherInstitute of Physics
Pages082009
Number of pages9
DOIs
Publication statusPublished - 2011
Event13th European Turbulence Conference, ETC 2011 - Warsaw, Poland
Duration: 12 Sep 201115 Sep 2011
Conference number: 13

Publication series

NameJournal of Physics: Conference Series
PublisherInstitute of Physics
Number8
Volume318
ISSN (Print)1742-6588

Conference

Conference13th European Turbulence Conference, ETC 2011
Abbreviated titleETC13
CountryPoland
CityWarsaw
Period12/09/1115/09/11

Keywords

  • METIS-282025
  • EWI-21198
  • EC Grant Agreement nr.: FP7/222919
  • IR-79478

Cite this

Overkamp, J., Stevens, R. J. A. M., Lohse, D., & Clercx, H. J. H. (2011). Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection. In Proceedings of the 13th European Turbulence Conference (ETC13) (pp. 082009). (Journal of Physics: Conference Series; Vol. 318, No. 8). Bristol: Institute of Physics. https://doi.org/10.1088/1742-6596/318/8/082009
Overkamp, J. ; Stevens, Richard Johannes Antonius Maria ; Lohse, Detlef ; Clercx, H.J.H. / Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection. Proceedings of the 13th European Turbulence Conference (ETC13). Bristol : Institute of Physics, 2011. pp. 082009 (Journal of Physics: Conference Series; 8).
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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).",
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author = "J. Overkamp and Stevens, {Richard Johannes Antonius Maria} and Detlef Lohse and H.J.H. Clercx",
year = "2011",
doi = "10.1088/1742-6596/318/8/082009",
language = "Undefined",
series = "Journal of Physics: Conference Series",
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number = "8",
pages = "082009",
booktitle = "Proceedings of the 13th European Turbulence Conference (ETC13)",
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Overkamp, J, Stevens, RJAM, Lohse, D & Clercx, HJH 2011, Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection. in Proceedings of the 13th European Turbulence Conference (ETC13). Journal of Physics: Conference Series, no. 8, vol. 318, Institute of Physics, Bristol, pp. 082009, 13th European Turbulence Conference, ETC 2011, Warsaw, Poland, 12/09/11. https://doi.org/10.1088/1742-6596/318/8/082009

Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection. / Overkamp, J.; Stevens, Richard Johannes Antonius Maria; Lohse, Detlef; Clercx, H.J.H.

Proceedings of the 13th European Turbulence Conference (ETC13). Bristol : Institute of Physics, 2011. p. 082009 (Journal of Physics: Conference Series; Vol. 318, No. 8).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

TY - GEN

T1 - Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection

AU - Overkamp, J.

AU - Stevens, Richard Johannes Antonius Maria

AU - Lohse, Detlef

AU - Clercx, H.J.H.

PY - 2011

Y1 - 2011

N2 - 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).

AB - 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).

KW - METIS-282025

KW - EWI-21198

KW - EC Grant Agreement nr.: FP7/222919

KW - IR-79478

U2 - 10.1088/1742-6596/318/8/082009

DO - 10.1088/1742-6596/318/8/082009

M3 - Conference contribution

T3 - Journal of Physics: Conference Series

SP - 082009

BT - Proceedings of the 13th European Turbulence Conference (ETC13)

PB - Institute of Physics

CY - Bristol

ER -

Overkamp J, Stevens RJAM, Lohse D, Clercx HJH. Effect of aspect-ratio on vortex distribution and heat transfer in rotating Rayleigh-Bénard convection. In Proceedings of the 13th European Turbulence Conference (ETC13). Bristol: Institute of Physics. 2011. p. 082009. (Journal of Physics: Conference Series; 8). https://doi.org/10.1088/1742-6596/318/8/082009