Convective heat transfer enhancement in low Reynolds number flows with wavy walls
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , |
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. |
id |
UFRJ_e1fc6c8a7ac8a39191dd39d0adc18a0f |
---|---|
oai_identifier_str |
oai:pantheon.ufrj.br:11422/8661 |
network_acronym_str |
UFRJ |
network_name_str |
Repositório Institucional da UFRJ |
repository_id_str |
|
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 |
_version_ |
1815455992046944256 |