Experimental investigation of the return flow instability in magnetized spherical Couette flows

We conduct magnetized spherical Couette (MSC) flow experiments in the return flow instability regime with GaInSn as the working fluid, the ratio of the inner to the outer sphere radii ri/ro = 0.5, the Reynolds number Re = 1000, and the Hartmann number Ha ¿ [27.5, 40]. Rotating waves with different a...

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Autores: Ogbonna, Jude, García González, Fernando|||0000-0003-4507-0486, Gundrum, Thomas, Seilmayer, Martin, Stefani, Frank
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/357104
Acceso en línea:https://hdl.handle.net/2117/357104
https://dx.doi.org/10.1063/5.0029570
Access Level:acceso abierto
Palabra clave:Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
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repository_id_str
spelling Experimental investigation of the return flow instability in magnetized spherical Couette flowsOgbonna, JudeGarcía González, Fernando|||0000-0003-4507-0486Gundrum, ThomasSeilmayer, MartinStefani, FrankFluid dynamicsDinàmica de fluidsÀrees temàtiques de la UPC::Física::Física de fluidsWe conduct magnetized spherical Couette (MSC) flow experiments in the return flow instability regime with GaInSn as the working fluid, the ratio of the inner to the outer sphere radii ri/ro = 0.5, the Reynolds number Re = 1000, and the Hartmann number Ha ¿ [27.5, 40]. Rotating waves with different azimuthal wavenumbers m ¿ {2, 3, 4} manifest in certain ranges of Ha in the experiments, depending on whether the values of Ha were fixed or varied from different initial values. These observations demonstrate the multistability of rotating waves, which we attribute to the dynamical system representing the state of the MSC flow tending to move along the same solution branch of the bifurcation diagram when Ha is varied. In experiments with both fixed and varying Ha, the rotation frequencies of the rotating waves are consistent with the results of nonlinear stability analysis. A brief numerical investigation shows that differences in the azimuthal wavenumbers of the rotating waves that develop in the flow also depend on the azimuthal modes that are initially excited.Peer Reviewed20202020-12-0120212021-11-25journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/357104https://dx.doi.org/10.1063/5.0029570reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3571042026-05-27T15:37:01Z
dc.title.none.fl_str_mv Experimental investigation of the return flow instability in magnetized spherical Couette flows
title Experimental investigation of the return flow instability in magnetized spherical Couette flows
spellingShingle Experimental investigation of the return flow instability in magnetized spherical Couette flows
Ogbonna, Jude
Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
title_short Experimental investigation of the return flow instability in magnetized spherical Couette flows
title_full Experimental investigation of the return flow instability in magnetized spherical Couette flows
title_fullStr Experimental investigation of the return flow instability in magnetized spherical Couette flows
title_full_unstemmed Experimental investigation of the return flow instability in magnetized spherical Couette flows
title_sort Experimental investigation of the return flow instability in magnetized spherical Couette flows
dc.creator.none.fl_str_mv Ogbonna, Jude
García González, Fernando|||0000-0003-4507-0486
Gundrum, Thomas
Seilmayer, Martin
Stefani, Frank
author Ogbonna, Jude
author_facet Ogbonna, Jude
García González, Fernando|||0000-0003-4507-0486
Gundrum, Thomas
Seilmayer, Martin
Stefani, Frank
author_role author
author2 García González, Fernando|||0000-0003-4507-0486
Gundrum, Thomas
Seilmayer, Martin
Stefani, Frank
author2_role author
author
author
author
dc.subject.none.fl_str_mv Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
topic Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
description We conduct magnetized spherical Couette (MSC) flow experiments in the return flow instability regime with GaInSn as the working fluid, the ratio of the inner to the outer sphere radii ri/ro = 0.5, the Reynolds number Re = 1000, and the Hartmann number Ha ¿ [27.5, 40]. Rotating waves with different azimuthal wavenumbers m ¿ {2, 3, 4} manifest in certain ranges of Ha in the experiments, depending on whether the values of Ha were fixed or varied from different initial values. These observations demonstrate the multistability of rotating waves, which we attribute to the dynamical system representing the state of the MSC flow tending to move along the same solution branch of the bifurcation diagram when Ha is varied. In experiments with both fixed and varying Ha, the rotation frequencies of the rotating waves are consistent with the results of nonlinear stability analysis. A brief numerical investigation shows that differences in the azimuthal wavenumbers of the rotating waves that develop in the flow also depend on the azimuthal modes that are initially excited.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-12-01
2021
2021-11-25
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/357104
https://dx.doi.org/10.1063/5.0029570
url https://hdl.handle.net/2117/357104
https://dx.doi.org/10.1063/5.0029570
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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