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DY: Fachverband Dynamik und Statistische Physik

DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion

DY 70.4: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

Rotating turbulent Rayleigh-Bérnard convection at very large Rayleigh numbers — •Marcel Wedi^1,2, Dennis van Gils³, Stephan Weiss², Guenter Ahlers⁴, and Eberhard Bodenschatz² — ¹Georg-August-Universität Göttingen, Germany — ²Max Planck Institute for Dynamics and Self-Organisation, Germany — ³Twente University, Enschede, The Netherlands — ⁴University of California, Santa Barbara, USA

Thermal convection in astro- and geophysical systems is both, highly turbulent and strongly influenced by Coriolis forces caused by the rotation of their celestial body. We aim to study the influence of rotation on the heat transport and the temperature field at very large thermal driving, in the High Pressure Convection Facility (HPCF) in Göttingen. The facility consists of a cylindrical cell with a diameter of 1.10 m and a height of 2.20 m that can be filled with pressurized sulfur hexafluoride (SF₆) of up to 19 bar. The height of the cell and the large density of SF₆ enable us to reach Ra up to 2× 10¹⁵. The cell is mounted on a rotating table and connected to the non-rotating world via water feed-throughs and slip rings. We can reach Ekman numbers down to 10⁻⁸ while still keeping the influence of centrifugal forces small. In our poster we show and discuss recent major upgrades of the facility as well as measurements of the heat flux and the temperature field.