SKM 2023 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 5: Fluid Physics: Turbulence and Convection
DY 5.6: Talk
Monday, March 27, 2023, 11:15–11:30, MOL 213
Convective turbulent superstructures in Rayleigh-Benard convection — •Hiufai Yik1, Stephan Weiss1,2, and Eberhard Bodenschatz1 — 1Max Planck Institute for Dynamics and Self-Organization — 2Max Planck Center for Complex Fluid Dynamics
We report experimental results on turbulent superstructures in high-turbulence thermal convection. The 0.7 m high, 3.5 m wide and 0.35 m deep rectangular cell was installed in the Göttingen U-Boot and filled with sulphur hexafluoride at pressures up to 19 bar. Convection in this installation can be investigated up to Rayleigh numbers Ra = 10^13 at Prandtl numbers of about 0.8. More than 200 thermistors were distributed in the upper and lower plates for temperature and heat flux measurements, and 20 additional thermistors in the centre of the cell to measure the fluid temperature along the longitudinal axis. We report the results on turbulent superstructures and their dependence on heat transport and boundary conditions. For this purpose, the upper and lower plates of the convection cell were each divided into 4 sections, with an independent temperature control allowing both homogeneous and inhomogeneous temperature boundary conditions and the selection of different turbulent superstructures.