Presentation Open Access
Schindler, Felix; Zürner, Till; Vogt, Tobias; Eckert, Sven; Schumacher, Jörg
<?xml version='1.0' encoding='utf-8'?> <resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://datacite.org/schema/kernel-4" xsi:schemaLocation="http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4.1/metadata.xsd"> <identifier identifierType="DOI">10.14278/rodare.228</identifier> <creators> <creator> <creatorName>Schindler, Felix</creatorName> <givenName>Felix</givenName> <familyName>Schindler</familyName> <affiliation>Helmholtz-Zentrum Dresden-Rossendorf</affiliation> </creator> <creator> <creatorName>Zürner, Till</creatorName> <givenName>Till</givenName> <familyName>Zürner</familyName> <affiliation>Technische Universität Ilmenau</affiliation> </creator> <creator> <creatorName>Vogt, Tobias</creatorName> <givenName>Tobias</givenName> <familyName>Vogt</familyName> <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-0022-5758</nameIdentifier> <affiliation>Helmholtz-Zentrum Dresden-Rossendorf</affiliation> </creator> <creator> <creatorName>Eckert, Sven</creatorName> <givenName>Sven</givenName> <familyName>Eckert</familyName> <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0003-1639-5417</nameIdentifier> <affiliation>Helmholtz-Zentrum Dresden-Rossendorf</affiliation> </creator> <creator> <creatorName>Schumacher, Jörg</creatorName> <givenName>Jörg</givenName> <familyName>Schumacher</familyName> <affiliation>Technische Universität Ilmenau</affiliation> </creator> </creators> <titles> <title>Low Prandtl Number Rayleigh-Bénard Convection in a Vertical Magnetic Field</title> </titles> <publisher>Rodare</publisher> <publicationYear>2019</publicationYear> <subjects> <subject>Rayleigh-Bénard-Convection</subject> <subject>Magnetohydrodynamic</subject> <subject>low Prandtl Number</subject> <subject>liquid metal</subject> <subject>Ultrasound velocimetry</subject> </subjects> <dates> <date dateType="Issued">2019-07-01</date> </dates> <language>en</language> <resourceType resourceTypeGeneral="Text">Presentation</resourceType> <alternateIdentifiers> <alternateIdentifier alternateIdentifierType="url">https://rodare.hzdr.de/record/228</alternateIdentifier> </alternateIdentifiers> <relatedIdentifiers> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsCitedBy">10.1017/S0022112096004491</relatedIdentifier> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsCitedBy">10.1103/physreve.62.r4520</relatedIdentifier> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsCitedBy">10.1017/jfm.2018.479</relatedIdentifier> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsCitedBy">10.1073/pnas.1417741112</relatedIdentifier> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsSupplementedBy">10.1017/jfm.2019.556</relatedIdentifier> <relatedIdentifier relatedIdentifierType="URL" relationType="IsSupplementedBy">https://www.hzdr.de/publications/Publ-28698</relatedIdentifier> <relatedIdentifier relatedIdentifierType="URL" relationType="IsIdenticalTo">https://www.hzdr.de/publications/Publ-30439</relatedIdentifier> <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.14278/rodare.227</relatedIdentifier> <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://rodare.hzdr.de/communities/fwd</relatedIdentifier> <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://rodare.hzdr.de/communities/hzdr</relatedIdentifier> <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://rodare.hzdr.de/communities/rodare</relatedIdentifier> </relatedIdentifiers> <version>1.0</version> <rightsList> <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights> <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights> </rightsList> <descriptions> <description descriptionType="Abstract"><p>Lecture (Conference)</p> <p>11th PAMIR International Conference- Fundamental and Applied MHD July 1-5, 2019, Reims, EVEM France</p> <p>We are investigating turbulent Rayleigh-B&eacute;nard convection in liquid metal under the<br> influence of a vertical magnetic field. Utilizing a combination of thermocouple (TC) and<br> ultrasound-Doppler-velocimetry (UDV) measurements gives us the possibility to directly<br> determine the temperature and velocity field, respectively. Further this gives us the<br> possibility to observe changes in the large-scale flow structure.<br> By applying magnetic fields to the liquid metal convection, we quantified changes of heat<br> and momentum transport in the liquid metal alloy GaInSn. The experimental results of our<br> setup agree well with theory findings and direct numerical simulations of the dynamics in<br> our convection cell. The requirement of large computing power at these parameters makes<br> it hard to simulate long-term dynamics with time scales from minutes to several hours. Thus<br> to investigate slow developing dynamics like sloshing, rotation, or deformation of the large-<br> scale flow structure model experiments are indispensable.<br> We demonstrate the suppression of the convective flow by a vertical magnetic field in a<br> cylindrical cell of aspect ratio 1. In this setup Rayleigh numbers up to 6&middot;107 are<br> investigated. The flow structure at low Hartmann numbers is a single roll large scale<br> circulation (LSC). Increasing the Hartmann number leads to a transition from the single-roll<br> LSC into a cell structure. An even stronger magnetic field supresses the flow in the center<br> of the cell completely and expels the flow to the side walls.<br> Even above the critical Hartmann numbers corresponding to the Chandrasekhar limit for<br> the onset of magnetoconvection in a fluid layer without lateral boundaries we still observe<br> remarkable flows near the side walls. The destabilising effect of the non-conducting side<br> walls was predicted by theory and simulations, and is here for the first time experimentally<br> confirmed.</p> <p>&nbsp;</p></description> <description descriptionType="Other">Support by Deutsche Forschungsgemeinschaft with grants VO 2332/1-1 and SCHU 1410/29-1</description> <description descriptionType="Other">{"references": ["10.1017/S0022112096004491", "10.1103/physreve.62.r4520", "10.1017/jfm.2018.479", "10.1073/pnas.1417741112", "10.1017/jfm.2019.556", "https://www.hzdr.de/publications/Publ-28698"]}</description> </descriptions> </resource>
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