Convective heat transfer enhancement in low Reynolds number flows with wavy walls

Detalhes bibliográficos
Autor(a) principal: Castellões, Fernando Vieira
Data de Publicação: 2010
Outros Autores: Quaresma, João Nazareno Nonato, Cotta, Renato Machado
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRJ
Texto Completo: http://hdl.handle.net/11422/8661
Resumo: The present work reports the analysis of combining low Reynolds number flows and channels with wall corrugation and the corresponding thermal exchange intensification achieved. The proposed model involves axial heat diffusion along the fluid and adiabatic regions both upstream and downstream to the corrugated heat transfer section, in light of the lower values of Reynolds numbers (and consequently Peclet numbers) that can be encountered in the present class of problems. Aimed at developing a fast and reliable methodology for optimization purposes, the related laminar velocity field is obtained by an approximate analytical solution valid for smooth corrugations and low Reynolds numbers, typical for instance of micro-channel configurations, locally satisfying the continuity equation. A hybrid numerical-analytical solution methodology for the energy equation is proposed, based on the Generalized Integral Transform Technique (GITT) in partial transformation mode for a transient formulation. The hybrid approach is first demonstrated for the case of a smooth parallel-plates channel situation, and the importance of axial heat conduction along the fluid is then illustrated. Heat transfer enhancement is analyzed in terms of the local Nusselt number and dimensionless bulk temperature along the heat transfer section. An illustrative sinusoidal corrugation shape is adopted and the influence of Reynolds number and corrugation geometric parameters is then discussed.
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spelling Convective heat transfer enhancement in low Reynolds number flows with wavy wallsLow Reynolds number flowsMicro-channelsWavy wallsHeat transfer enhancementForced convectionIntegral transformsCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOSThe present work reports the analysis of combining low Reynolds number flows and channels with wall corrugation and the corresponding thermal exchange intensification achieved. The proposed model involves axial heat diffusion along the fluid and adiabatic regions both upstream and downstream to the corrugated heat transfer section, in light of the lower values of Reynolds numbers (and consequently Peclet numbers) that can be encountered in the present class of problems. Aimed at developing a fast and reliable methodology for optimization purposes, the related laminar velocity field is obtained by an approximate analytical solution valid for smooth corrugations and low Reynolds numbers, typical for instance of micro-channel configurations, locally satisfying the continuity equation. A hybrid numerical-analytical solution methodology for the energy equation is proposed, based on the Generalized Integral Transform Technique (GITT) in partial transformation mode for a transient formulation. The hybrid approach is first demonstrated for the case of a smooth parallel-plates channel situation, and the importance of axial heat conduction along the fluid is then illustrated. Heat transfer enhancement is analyzed in terms of the local Nusselt number and dimensionless bulk temperature along the heat transfer section. An illustrative sinusoidal corrugation shape is adopted and the influence of Reynolds number and corrugation geometric parameters is then discussed.Indisponível.ElsevierBrasilNúcleo Interdisciplinar de Dinâmica dos Fluidos2019-07-04T16:14:15Z2023-12-21T03:01:02Z2010-02-03info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0017-9310http://hdl.handle.net/11422/866110.1016/j.ijheatmasstransfer.2009.12.054engInternational Journal of Heat and Mass TransferCastellões, Fernando VieiraQuaresma, João Nazareno NonatoCotta, Renato Machadoinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRJinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ2023-12-21T03:01:02Zoai:pantheon.ufrj.br:11422/8661Repositório InstitucionalPUBhttp://www.pantheon.ufrj.br/oai/requestpantheon@sibi.ufrj.bropendoar:2023-12-21T03:01:02Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Convective heat transfer enhancement in low Reynolds number flows with wavy walls
title Convective heat transfer enhancement in low Reynolds number flows with wavy walls
spellingShingle Convective heat transfer enhancement in low Reynolds number flows with wavy walls
Castellões, Fernando Vieira
Low Reynolds number flows
Micro-channels
Wavy walls
Heat transfer enhancement
Forced convection
Integral transforms
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
title_short Convective heat transfer enhancement in low Reynolds number flows with wavy walls
title_full Convective heat transfer enhancement in low Reynolds number flows with wavy walls
title_fullStr Convective heat transfer enhancement in low Reynolds number flows with wavy walls
title_full_unstemmed Convective heat transfer enhancement in low Reynolds number flows with wavy walls
title_sort Convective heat transfer enhancement in low Reynolds number flows with wavy walls
author Castellões, Fernando Vieira
author_facet Castellões, Fernando Vieira
Quaresma, João Nazareno Nonato
Cotta, Renato Machado
author_role author
author2 Quaresma, João Nazareno Nonato
Cotta, Renato Machado
author2_role author
author
dc.contributor.author.fl_str_mv Castellões, Fernando Vieira
Quaresma, João Nazareno Nonato
Cotta, Renato Machado
dc.subject.por.fl_str_mv Low Reynolds number flows
Micro-channels
Wavy walls
Heat transfer enhancement
Forced convection
Integral transforms
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
topic Low Reynolds number flows
Micro-channels
Wavy walls
Heat transfer enhancement
Forced convection
Integral transforms
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
description The present work reports the analysis of combining low Reynolds number flows and channels with wall corrugation and the corresponding thermal exchange intensification achieved. The proposed model involves axial heat diffusion along the fluid and adiabatic regions both upstream and downstream to the corrugated heat transfer section, in light of the lower values of Reynolds numbers (and consequently Peclet numbers) that can be encountered in the present class of problems. Aimed at developing a fast and reliable methodology for optimization purposes, the related laminar velocity field is obtained by an approximate analytical solution valid for smooth corrugations and low Reynolds numbers, typical for instance of micro-channel configurations, locally satisfying the continuity equation. A hybrid numerical-analytical solution methodology for the energy equation is proposed, based on the Generalized Integral Transform Technique (GITT) in partial transformation mode for a transient formulation. The hybrid approach is first demonstrated for the case of a smooth parallel-plates channel situation, and the importance of axial heat conduction along the fluid is then illustrated. Heat transfer enhancement is analyzed in terms of the local Nusselt number and dimensionless bulk temperature along the heat transfer section. An illustrative sinusoidal corrugation shape is adopted and the influence of Reynolds number and corrugation geometric parameters is then discussed.
publishDate 2010
dc.date.none.fl_str_mv 2010-02-03
2019-07-04T16:14:15Z
2023-12-21T03:01:02Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv 0017-9310
http://hdl.handle.net/11422/8661
10.1016/j.ijheatmasstransfer.2009.12.054
identifier_str_mv 0017-9310
10.1016/j.ijheatmasstransfer.2009.12.054
url http://hdl.handle.net/11422/8661
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv International Journal of Heat and Mass Transfer
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
Brasil
Núcleo Interdisciplinar de Dinâmica dos Fluidos
publisher.none.fl_str_mv Elsevier
Brasil
Núcleo Interdisciplinar de Dinâmica dos Fluidos
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRJ
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
instname_str Universidade Federal do Rio de Janeiro (UFRJ)
instacron_str UFRJ
institution UFRJ
reponame_str Repositório Institucional da UFRJ
collection Repositório Institucional da UFRJ
repository.name.fl_str_mv Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)
repository.mail.fl_str_mv pantheon@sibi.ufrj.br
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