Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability

The transition between the stable base state of the magnetized spherical Couette (MSC) flow and the return flow instability is experimentally investigated. The experiments are conducted using an MSC setup consisting of insulating spheres with the ratio of the inner to the outer radii ri/ro = 0.5, Re...

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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:2022
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:2117/367318
Acceso en línea:https://hdl.handle.net/2117/367318
https://dx.doi.org/10.1088/1757-899x/1223/1/012004
Access Level:acceso abierto
Palabra clave:Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria dels materials
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spelling Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instabilityOgbonna, JudeGarcía González, Fernando|||0000-0003-4507-0486Gundrum, ThomasSeilmayer, MartinStefani, FrankFluid dynamicsDinàmica de fluidsÀrees temàtiques de la UPC::Enginyeria dels materialsThe transition between the stable base state of the magnetized spherical Couette (MSC) flow and the return flow instability is experimentally investigated. The experiments are conducted using an MSC setup consisting of insulating spheres with the ratio of the inner to the outer radii ri/ro = 0.5, Reynolds number Re = 1000 and Hartmann number Ha ¿ [25, 29]. The transition is characterized by changes in the power spectra of the azimuthal modes in the flow as Ha is dynamically changed. The transition occurs in the interval Ha ¿ [26.5, 27.5]. The evolution of the power spectra of the azimuthal modes exhibits hysteretic effect depending on whether Ha is increased or decreased within the experimental interval. The power spectra in the azimuthal modes m ¿ {3, 4} increases and remains dominant as Ha is increased, while the power spectra in m ¿ {2, 4} are dominant while the flow is time dependent due to return flow instability as Ha is decreased.Peer ReviewedInstitute of Physics (IOP)20222022-01-0120222022-05-12journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/367318https://dx.doi.org/10.1088/1757-899x/1223/1/012004reponame: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:2117/3673182026-05-27T15:37:01Z
dc.title.none.fl_str_mv Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
title Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
spellingShingle Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
Ogbonna, Jude
Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria dels materials
title_short Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
title_full Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
title_fullStr Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
title_full_unstemmed Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
title_sort Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability
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::Enginyeria dels materials
topic Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria dels materials
description The transition between the stable base state of the magnetized spherical Couette (MSC) flow and the return flow instability is experimentally investigated. The experiments are conducted using an MSC setup consisting of insulating spheres with the ratio of the inner to the outer radii ri/ro = 0.5, Reynolds number Re = 1000 and Hartmann number Ha ¿ [25, 29]. The transition is characterized by changes in the power spectra of the azimuthal modes in the flow as Ha is dynamically changed. The transition occurs in the interval Ha ¿ [26.5, 27.5]. The evolution of the power spectra of the azimuthal modes exhibits hysteretic effect depending on whether Ha is increased or decreased within the experimental interval. The power spectra in the azimuthal modes m ¿ {3, 4} increases and remains dominant as Ha is increased, while the power spectra in m ¿ {2, 4} are dominant while the flow is time dependent due to return flow instability as Ha is decreased.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-01-01
2022
2022-05-12
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/2117/367318
https://dx.doi.org/10.1088/1757-899x/1223/1/012004
url https://hdl.handle.net/2117/367318
https://dx.doi.org/10.1088/1757-899x/1223/1/012004
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.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
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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