Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Convection

DY 16.4: Talk

Monday, March 16, 2020, 16:15–16:30, ZEU 147

Heat and momentum transport enhancement in liquid metal convection exposed to horizontal magnetic fields — •Tobias Vogt¹, Juancheng Yang², Felix Schindler¹, and Sven Eckert¹ — ¹Helmholtz Zentrum Dresden-Rossendorf, Dresden, Germany — ²Xi'an Jiaotong University, Xi'an, China

We investigate the effect of a static, horizontal magnetic field on a liquid metal Rayleigh-Bénard convection by means of laboratory experiments. Although a static magnetic field acts as a stabilizing force on the fluid, we find that self-organized convective flow structures reach an optimal state where the heat transport significantly increases and convective velocities reach the theoretical free-fall limit. Our measurements show that the application of the magnetic field leads to an anisotropic, highly ordered flow structure and a decrease of the turbulent fluctuations. When the magnetic field strength is increased beyond the optimum, Hartmann braking becomes dominant and leads to a reduction of the heat and momentum transport. The results are relevant for magneto-hydrodynamic convective flows in stellar interiors and planetary cores.