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Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9
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| Veröffentlicht in: | New journal of physics 15(2013) vom: Jan., Artikel-ID 013040 |
|---|---|
| Personen und Körperschaften: | , , |
| Titel: | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9/ Ronald du Puits; Christian Resagk and André Thess |
| Format: | E-Book-Kapitel |
| Sprache: | Englisch |
| veröffentlicht: |
2013
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| Gesamtaufnahme: |
: New journal of physics, 15(2013) vom: Jan., Artikel-ID 013040
, volume:15 |
| Quelle: | Verbunddaten SWB Lizenzfreie Online-Ressourcen |
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| 520 | |a We report highly resolved temperature measurements in turbulent Rayleigh-Bénard convection in air at a fixed Prandtl number Pr = 0.7. Extending our previous work (du Puits et al 2007 J. Fluid Mech. 572 231-54), we carried out measurements at various aspect ratios while keeping the Rayleigh number constant. We demonstrate that the temperature field inside the convective boundary layers of both horizontal plates is virtually independent on the global flow pattern accompanying the variation in the aspect ratio. Thanks to technical upgrades of the experimental facility as well as a significant improvement of the accuracy and reliability of our temperature measurement - and unlike in our previous work - we find that the measured profiles of the time-averaged temperature field neither follow a clear power-law trend nor fit a linear or a logarithmic scaling over a significant fraction of the boundary-layer thickness. Analyzing the temperature data simultaneously acquired at both horizontal plates, various transitions in the cross-correlation and the auto-correlation function of the temperature signals are observed while varying the aspect ratio 0. These transitions might be associated with a change in the global flow pattern from a single-roll mode at 0 = 1 toward a double- or a multi-roll mode pattern at higher aspect ratios. | ||
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| contents | We report highly resolved temperature measurements in turbulent Rayleigh-Bénard convection in air at a fixed Prandtl number Pr = 0.7. Extending our previous work (du Puits et al 2007 J. Fluid Mech. 572 231-54), we carried out measurements at various aspect ratios while keeping the Rayleigh number constant. We demonstrate that the temperature field inside the convective boundary layers of both horizontal plates is virtually independent on the global flow pattern accompanying the variation in the aspect ratio. Thanks to technical upgrades of the experimental facility as well as a significant improvement of the accuracy and reliability of our temperature measurement - and unlike in our previous work - we find that the measured profiles of the time-averaged temperature field neither follow a clear power-law trend nor fit a linear or a logarithmic scaling over a significant fraction of the boundary-layer thickness. Analyzing the temperature data simultaneously acquired at both horizontal plates, various transitions in the cross-correlation and the auto-correlation function of the temperature signals are observed while varying the aspect ratio 0. These transitions might be associated with a change in the global flow pattern from a single-roll mode at 0 = 1 toward a double- or a multi-roll mode pattern at higher aspect ratios. |
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| spelling | Du Puits, Ronald 1964- (DE-588)133937690 (DE-627)55874303X (DE-576)300204353 aut, Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 Ronald du Puits; Christian Resagk and André Thess, 2013, 23, Text txt rdacontent, Computermedien c rdamedia, Online-Ressource cr rdacarrier, We report highly resolved temperature measurements in turbulent Rayleigh-Bénard convection in air at a fixed Prandtl number Pr = 0.7. Extending our previous work (du Puits et al 2007 J. Fluid Mech. 572 231-54), we carried out measurements at various aspect ratios while keeping the Rayleigh number constant. We demonstrate that the temperature field inside the convective boundary layers of both horizontal plates is virtually independent on the global flow pattern accompanying the variation in the aspect ratio. Thanks to technical upgrades of the experimental facility as well as a significant improvement of the accuracy and reliability of our temperature measurement - and unlike in our previous work - we find that the measured profiles of the time-averaged temperature field neither follow a clear power-law trend nor fit a linear or a logarithmic scaling over a significant fraction of the boundary-layer thickness. Analyzing the temperature data simultaneously acquired at both horizontal plates, various transitions in the cross-correlation and the auto-correlation function of the temperature signals are observed while varying the aspect ratio 0. These transitions might be associated with a change in the global flow pattern from a single-roll mode at 0 = 1 toward a double- or a multi-roll mode pattern at higher aspect ratios., Resagk, Christian (DE-588)1209954788 (DE-627)1697937268 aut, Thess, André 1964- (DE-588)130211613 (DE-627)493796266 (DE-576)298065347 aut, In New journal of physics [Bad Honnef] : Dt. Physikalische Ges., 1999 15(2013) vom: Jan., Artikel-ID 013040 Online-Ressource (DE-627)265510562 (DE-600)1464444-7 (DE-576)078991846 1367-2630 nnns, volume:15 year:2013 month:01 elocationid:013040 extent:23, https://doi.org/10.1088/1367-2630/15/1/013040 Resolving-System Volltext, http://www.db-thueringen.de/servlets/DocumentServlet?id=26116 V:DE-601 B:DE-Ilm1 text/html Verlag ilmedia/DBT kostenfrei Volltext, http://www.db-thueringen.de/servlets/DocumentServlet?id=26116 LFER, LFER 2019-07-15T00:00:00Z |
| spellingShingle | Du Puits, Ronald, Resagk, Christian, Thess, André, Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9, We report highly resolved temperature measurements in turbulent Rayleigh-Bénard convection in air at a fixed Prandtl number Pr = 0.7. Extending our previous work (du Puits et al 2007 J. Fluid Mech. 572 231-54), we carried out measurements at various aspect ratios while keeping the Rayleigh number constant. We demonstrate that the temperature field inside the convective boundary layers of both horizontal plates is virtually independent on the global flow pattern accompanying the variation in the aspect ratio. Thanks to technical upgrades of the experimental facility as well as a significant improvement of the accuracy and reliability of our temperature measurement - and unlike in our previous work - we find that the measured profiles of the time-averaged temperature field neither follow a clear power-law trend nor fit a linear or a logarithmic scaling over a significant fraction of the boundary-layer thickness. Analyzing the temperature data simultaneously acquired at both horizontal plates, various transitions in the cross-correlation and the auto-correlation function of the temperature signals are observed while varying the aspect ratio 0. These transitions might be associated with a change in the global flow pattern from a single-roll mode at 0 = 1 toward a double- or a multi-roll mode pattern at higher aspect ratios. |
| swb_id_str | 9735751496 |
| title | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 |
| title_auth | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 |
| title_full | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 Ronald du Puits; Christian Resagk and André Thess |
| title_fullStr | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 Ronald du Puits; Christian Resagk and André Thess |
| title_full_unstemmed | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 Ronald du Puits; Christian Resagk and André Thess |
| title_in_hierarchy | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 / Ronald du Puits; Christian Resagk and André Thess, |
| title_short | Thermal boundary layers in turbulent Rayleigh-Bénard convection at aspect ratios between 1 and 9 |
| title_sort | thermal boundary layers in turbulent rayleigh benard convection at aspect ratios between 1 and 9 |
| url | https://doi.org/10.1088/1367-2630/15/1/013040, http://www.db-thueringen.de/servlets/DocumentServlet?id=26116 |