July 1, 2019 Presentation Open Access

Schindler, Felix; Zürner, Till; Vogt, Tobias; Eckert, Sven; Schumacher, Jörg

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    <subfield code="a">Rayleigh-Bénard-Convection</subfield>
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    <subfield code="a">Support by Deutsche Forschungsgemeinschaft with grants VO 2332/1-1 and SCHU 1410/29-1</subfield>
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    <subfield code="a">&lt;p&gt;Lecture (Conference)&lt;/p&gt;

&lt;p&gt;11th PAMIR International Conference- Fundamental and Applied MHD July 1-5, 2019, Reims, EVEM France&lt;/p&gt;

&lt;p&gt;We are investigating turbulent Rayleigh-B&amp;eacute;nard convection in liquid metal under the&lt;br&gt;
influence of a vertical magnetic field. Utilizing a combination of thermocouple (TC) and&lt;br&gt;
ultrasound-Doppler-velocimetry (UDV) measurements gives us the possibility to directly&lt;br&gt;
determine the temperature and velocity field, respectively. Further this gives us the&lt;br&gt;
possibility to observe changes in the large-scale flow structure.&lt;br&gt;
By applying magnetic fields to the liquid metal convection, we quantified changes of heat&lt;br&gt;
and momentum transport in the liquid metal alloy GaInSn. The experimental results of our&lt;br&gt;
setup agree well with theory findings and direct numerical simulations of the dynamics in&lt;br&gt;
our convection cell. The requirement of large computing power at these parameters makes&lt;br&gt;
it hard to simulate long-term dynamics with time scales from minutes to several hours. Thus&lt;br&gt;
to investigate slow developing dynamics like sloshing, rotation, or deformation of the large-&lt;br&gt;
scale flow structure model experiments are indispensable.&lt;br&gt;
We demonstrate the suppression of the convective flow by a vertical magnetic field in a&lt;br&gt;
cylindrical cell of aspect ratio 1. In this setup Rayleigh numbers up to 6&amp;middot;107 are&lt;br&gt;
investigated. The flow structure at low Hartmann numbers is a single roll large scale&lt;br&gt;
circulation (LSC). Increasing the Hartmann number leads to a transition from the single-roll&lt;br&gt;
LSC into a cell structure. An even stronger magnetic field supresses the flow in the center&lt;br&gt;
of the cell completely and expels the flow to the side walls.&lt;br&gt;
Even above the critical Hartmann numbers corresponding to the Chandrasekhar limit for&lt;br&gt;
the onset of magnetoconvection in a fluid layer without lateral boundaries we still observe&lt;br&gt;
remarkable flows near the side walls. The destabilising effect of the non-conducting side&lt;br&gt;
walls was predicted by theory and simulations, and is here for the first time experimentally&lt;br&gt;
confirmed.&lt;/p&gt;

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