Conference (Lecture):

American Physics Society (APS) DFD meeting 2019 Seattle

In the presented Rayleigh-Bénard convection experiments the turbulent 3d- flow of the liquid gallium-indium-tin alloy is investigated by use of ultrasound Doppler velocimetry, temperature and contactless inductive flow tomography measurements. We reconstruct for the first time near-wall as well as bulk flow, momentum and heat transport as well as long-term behaviour of the large-scale liquid metal flow at a low Prandtl number of 0.029 and high Rayleigh numbers up to 6 · 10e7. Also the influence of a strong magnetic field on the turbulent liquid metal is investigated. The results of the experiments are compared to direct numerical simulations and other experiments. These are also considered for the interpretation of the measured turbulence statistics. Our experiments aim to provide a deeper understanding of the turbulent convection and its interaction with magnetic fields in turbulent low Prandtl number flows as those in molten steel, aluminium or geo- and astrophysical flows.

Supported by Deutsche Forschungsgemeinschaft with grants VO 2332/1-1 and SCHU 1410/29-1

{"references": ["10.1017/jfm.2019.556"]}