July 1, 2019 Presentation Open Access

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

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    <dct:title>Low Prandtl Number Rayleigh-Bénard Convection in a Vertical Magnetic Field</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2019</dct:issued>
    <dcat:keyword>Rayleigh-Bénard-Convection</dcat:keyword>
    <dcat:keyword>Magnetohydrodynamic</dcat:keyword>
    <dcat:keyword>low Prandtl Number</dcat:keyword>
    <dcat:keyword>liquid metal</dcat:keyword>
    <dcat:keyword>Ultrasound velocimetry</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-07-01</dct:issued>
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    <dct:description>&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; &lt;p&gt;&amp;nbsp;&lt;/p&gt;</dct:description>
    <dct:description xml:lang="">Support by Deutsche Forschungsgemeinschaft with grants VO 2332/1-1 and SCHU 1410/29-1</dct:description>
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