Forced vortex merging and splitting events in ferrofluidic Couette flow

Time-dependent boundary conditions being an ubiquitous observation in numerous natural and industrial flows. However, to date the influence of such temporal modulations has been given minor attention. The present problem addresses ferrofluidic Couette flow in between co-rotating cylinders in a spati...

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Autor: Altmeyer, Sebastian Andreas|||0000-0001-5964-0203
Formato: artículo
Fecha de publicación:2023
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/389770
Acesso em linha:https://hdl.handle.net/2117/389770
https://dx.doi.org/10.1016/j.jmmm.2023.170666
Access Level:acceso abierto
Palavra-chave:Shear flow
Magnetic fluids
Taylor vortices
Taylor-Couette flow
Vortex splitting and merging
Ferrofluids
Alternating magnetic field
Time-dependent forcing
Vòrtexs de Taylor
Àrees temàtiques de la UPC::Física
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spelling Forced vortex merging and splitting events in ferrofluidic Couette flowAltmeyer, Sebastian Andreas|||0000-0001-5964-0203Shear flowMagnetic fluidsTaylor vorticesTaylor-Couette flowVortex splitting and mergingFerrofluidsMagnetic fluidsAlternating magnetic fieldTime-dependent forcingVòrtexs de TaylorFerrofluidsÀrees temàtiques de la UPC::FísicaTime-dependent boundary conditions being an ubiquitous observation in numerous natural and industrial flows. However, to date the influence of such temporal modulations has been given minor attention. The present problem addresses ferrofluidic Couette flow in between co-rotating cylinders in a spatially homogeneous magnetic field subject to time-periodic modulation. Using a modified Niklas approximation, we study the effect of amplitude and frequency modulation onto the the transition scenarios between different toroidal flow structures, nV states, via vortex merging and splitting. Thereby the system response appears to be quite sensitive/dependent on the driving frequency OH , which can cause a notable “delay” in the system response. Aside, as a result of the inertia of the ferrofluid, resisting the fast-changing accelerating Kelvin force, new, temporal nV states appear within an alternating field. These states are unstable under static fields. Finally we show that within the same nV state, while keeping similar flow dynamics, large discrepancies in angular momentum and torque can be observed.This work has been supported by the Spanish Ministerio de Ciencia e Innovación grant PID2019-105162RB-I00.Peer ReviewedElsevier20232023-01-0120232023-06-27journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/389770https://dx.doi.org/10.1016/j.jmmm.2023.170666reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengAgencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2019-105162RB-I00 TURBULENCIA Y GRANDES ESTRUCTURAS COHERENTES DE LA CAPA LIMITE ATMOSFERICA: ASPECTOS FUNDAMENTALES PARA PARAMETRIZAR FORMACION DE NUBES Y PARA APLICACIONES DE ENERGIA EOLICA.open accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3897702026-05-27T15:37:01Z
dc.title.none.fl_str_mv Forced vortex merging and splitting events in ferrofluidic Couette flow
title Forced vortex merging and splitting events in ferrofluidic Couette flow
spellingShingle Forced vortex merging and splitting events in ferrofluidic Couette flow
Altmeyer, Sebastian Andreas|||0000-0001-5964-0203
Shear flow
Magnetic fluids
Taylor vortices
Taylor-Couette flow
Vortex splitting and merging
Ferrofluids
Magnetic fluids
Alternating magnetic field
Time-dependent forcing
Vòrtexs de Taylor
Ferrofluids
Àrees temàtiques de la UPC::Física
title_short Forced vortex merging and splitting events in ferrofluidic Couette flow
title_full Forced vortex merging and splitting events in ferrofluidic Couette flow
title_fullStr Forced vortex merging and splitting events in ferrofluidic Couette flow
title_full_unstemmed Forced vortex merging and splitting events in ferrofluidic Couette flow
title_sort Forced vortex merging and splitting events in ferrofluidic Couette flow
dc.creator.none.fl_str_mv Altmeyer, Sebastian Andreas|||0000-0001-5964-0203
author Altmeyer, Sebastian Andreas|||0000-0001-5964-0203
author_facet Altmeyer, Sebastian Andreas|||0000-0001-5964-0203
author_role author
dc.subject.none.fl_str_mv Shear flow
Magnetic fluids
Taylor vortices
Taylor-Couette flow
Vortex splitting and merging
Ferrofluids
Magnetic fluids
Alternating magnetic field
Time-dependent forcing
Vòrtexs de Taylor
Ferrofluids
Àrees temàtiques de la UPC::Física
topic Shear flow
Magnetic fluids
Taylor vortices
Taylor-Couette flow
Vortex splitting and merging
Ferrofluids
Magnetic fluids
Alternating magnetic field
Time-dependent forcing
Vòrtexs de Taylor
Ferrofluids
Àrees temàtiques de la UPC::Física
description Time-dependent boundary conditions being an ubiquitous observation in numerous natural and industrial flows. However, to date the influence of such temporal modulations has been given minor attention. The present problem addresses ferrofluidic Couette flow in between co-rotating cylinders in a spatially homogeneous magnetic field subject to time-periodic modulation. Using a modified Niklas approximation, we study the effect of amplitude and frequency modulation onto the the transition scenarios between different toroidal flow structures, nV states, via vortex merging and splitting. Thereby the system response appears to be quite sensitive/dependent on the driving frequency OH , which can cause a notable “delay” in the system response. Aside, as a result of the inertia of the ferrofluid, resisting the fast-changing accelerating Kelvin force, new, temporal nV states appear within an alternating field. These states are unstable under static fields. Finally we show that within the same nV state, while keeping similar flow dynamics, large discrepancies in angular momentum and torque can be observed.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-01-01
2023
2023-06-27
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/2117/389770
https://dx.doi.org/10.1016/j.jmmm.2023.170666
url https://hdl.handle.net/2117/389770
https://dx.doi.org/10.1016/j.jmmm.2023.170666
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2019-105162RB-I00 TURBULENCIA Y GRANDES ESTRUCTURAS COHERENTES DE LA CAPA LIMITE ATMOSFERICA: ASPECTOS FUNDAMENTALES PARA PARAMETRIZAR FORMACION DE NUBES Y PARA APLICACIONES DE ENERGIA EOLICA.
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
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 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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score 15,301603

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