Effects of Reynolds number and aspect ratio on the opposed-jet flow instability

The effects of Reynolds number and aspect ratio on the distinct resulting flow regimes in an opposed-jet configuration are analyzed. The solution of the isothermal governing equations have been obtained in the two-dimensional case by means of Phoenics-2009 software for unsteady, unbounded, incompres...

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Detalles Bibliográficos
Autor: Suñol Galofre, Francesc Xavier|||0000-0001-8947-7814
Tipo de recurso: informe técnico
Fecha de publicación:2010
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:2117/439506
Acceso en línea:https://hdl.handle.net/2117/439506
Access Level:acceso abierto
Palabra clave:Jets -- Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
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spelling Effects of Reynolds number and aspect ratio on the opposed-jet flow instabilitySuñol Galofre, Francesc Xavier|||0000-0001-8947-7814Jets -- Fluid dynamicsDinàmica de fluidsÀrees temàtiques de la UPC::Física::Física de fluidsThe effects of Reynolds number and aspect ratio on the distinct resulting flow regimes in an opposed-jet configuration are analyzed. The solution of the isothermal governing equations have been obtained in the two-dimensional case by means of Phoenics-2009 software for unsteady, unbounded, incompressible flows. The pressure and velocity fields have been obtained for different values of nozzle separations, ranging from 5 to 50 nozzle diameters, and for Reynolds numbers ranging from Re = 10 to Re = 2000. For separations of h = 9d, where d is the nozzle diameter, the steady symmetric solution becomes unstable and loses its symmetry respect to stagnation line as well as to the axial direction. As a result, the opposed jets start to deflect with a fixed frequency and increasing amplitude, until a chaotic behavior is reached. For large aspect ratios, no periodic patterns appear in the transition between the unstable steady solution and the chaotic solution. For the case of nozzle separation equal to 10 diameters, a new type of instability has been found at Re = 1000. This instability appears as capillary waves in the outgoing jets and can be inhibited by turbulent mechanisms.20102010-04-0920252025-07-28reporthttp://purl.org/coar/resource_type/c_93fcAOhttp://purl.org/coar/version/c_b1a7d7d4d402bcceinfo:eu-repo/semantics/reportapplication/pdfhttps://hdl.handle.net/2117/439506reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengMinisterio de Ciencia e Innovación http://doi.org/10.13039/501100004837 AYA2009-11493 Gestion De Fluidos Multifasicos En Condiciones De Baja Gravedadopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4395062026-05-27T15:37:01Z
dc.title.none.fl_str_mv Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
title Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
spellingShingle Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
Suñol Galofre, Francesc Xavier|||0000-0001-8947-7814
Jets -- Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
title_short Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
title_full Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
title_fullStr Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
title_full_unstemmed Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
title_sort Effects of Reynolds number and aspect ratio on the opposed-jet flow instability
dc.creator.none.fl_str_mv Suñol Galofre, Francesc Xavier|||0000-0001-8947-7814
author Suñol Galofre, Francesc Xavier|||0000-0001-8947-7814
author_facet Suñol Galofre, Francesc Xavier|||0000-0001-8947-7814
author_role author
dc.subject.none.fl_str_mv Jets -- Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
topic Jets -- Fluid dynamics
Dinàmica de fluids
Àrees temàtiques de la UPC::Física::Física de fluids
description The effects of Reynolds number and aspect ratio on the distinct resulting flow regimes in an opposed-jet configuration are analyzed. The solution of the isothermal governing equations have been obtained in the two-dimensional case by means of Phoenics-2009 software for unsteady, unbounded, incompressible flows. The pressure and velocity fields have been obtained for different values of nozzle separations, ranging from 5 to 50 nozzle diameters, and for Reynolds numbers ranging from Re = 10 to Re = 2000. For separations of h = 9d, where d is the nozzle diameter, the steady symmetric solution becomes unstable and loses its symmetry respect to stagnation line as well as to the axial direction. As a result, the opposed jets start to deflect with a fixed frequency and increasing amplitude, until a chaotic behavior is reached. For large aspect ratios, no periodic patterns appear in the transition between the unstable steady solution and the chaotic solution. For the case of nozzle separation equal to 10 diameters, a new type of instability has been found at Re = 1000. This instability appears as capillary waves in the outgoing jets and can be inhibited by turbulent mechanisms.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-04-09
2025
2025-07-28
dc.type.none.fl_str_mv report
http://purl.org/coar/resource_type/c_93fc
AO
http://purl.org/coar/version/c_b1a7d7d4d402bcce
dc.type.openaire.fl_str_mv info:eu-repo/semantics/report
format report
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/439506
url https://hdl.handle.net/2117/439506
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Ciencia e Innovación http://doi.org/10.13039/501100004837 AYA2009-11493 Gestion De Fluidos Multifasicos En Condiciones De Baja Gravedad
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
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
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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score 15,812429

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