000014388 001__ 14388
000014388 005__ 20161115100150.0
000014388 04107 $$aeng
000014388 046__ $$k2016-08-21
000014388 100__ $$aBodenschatz, Eberhard
000014388 24500 $$aThe Transition to the Ultimate State in Turbulent Thermal Convection

000014388 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014388 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014388 506__ $$arestricted
000014388 520__ $$2eng$$aWe report measurements on turbulent Rayleigh-B´enard convection using three cylindrical samples with aspect ratios (diameter/height) Γ = 1.00, 0.50 and 0.33. All samples had the same diameter D = 1.12 m, but different heights L. Compressed sulfur hexafluoride gas (SF6 ) at pressures up to 19 bar was used as the fluid at the G¨ottingen Turbulence Facility (see www.EuHIT.org). The 15 measurements were conducted over the Rayleigh-number range 1012 < ∼ 4 × 10 and for Prandtl numbers P r near 0.8. In three ∼ Ra < independent measurements, namely global heat transport, local turbulent Reynolds numbers, and large-scale-circulation dynamics, we observed a transition over a range of Ra from the classical regime to a new regime which has been referred to as “ultimate”. We discuss the properties of the classical and the ultimate state, as well as the influence of rotation on this system.

000014388 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014388 653__ $$a

000014388 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014388 720__ $$aBodenschatz, Eberhard
000014388 8560_ $$ffischerc@itam.cas.cz
000014388 8564_ $$s94705$$uhttps://invenio.itam.cas.cz/record/14388/files/SL.FM-5.pdf$$yOriginal version of the author's contribution as presented on CD,  page 17, code SL.FM-5
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000014388 962__ $$r13812
000014388 980__ $$aPAPER