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- Title
Free-fall velocities and heat transport enhancement in liquid metal magneto-convection.
- Authors
Vogt, Tobias; Juan-Cheng Yang; Schindler, Felix; Eckert, Sven
- Abstract
In geo- and astrophysics, low Prandtl number convective flows often interact with magnetic fields. Although a static magnetic field acts as a stabilizing force on such flow fields, 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, i.e. the maximum possible velocity a fluid parcel can achieve when its potential buoyant energy is fully converted into kinetic energy. Our measurements show that the application of a static 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 state, Hartmann braking becomes dominant and leads to a reduction of the heat and momentum transport. The results are relevant for the understanding of magneto-hydrodynamic convective flows in planetary cores and stellar interiors in regions with strong toroidal magnetic fields oriented perpendicular to temperature gradients.
- Subjects
LIQUID metals; PRANDTL number; MAGNETIC flux density; KINETIC energy; MAGNETIC fields; VORTEX generators; CONVECTIVE flow
- Publication
Journal of Fluid Mechanics, 2021, Vol 915, pA68-1
- ISSN
0022-1120
- Publication type
Article
- DOI
10.1017/jfm.2021.108