Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements

Detalhes bibliográficos
Autor(a) principal: R. G. Sousa
Data de Publicação: 2004
Outros Autores: A. M. F. R. Pinto, M. L. Riethmuller, J. B. L. M. Campos
Tipo de documento: Livro
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://repositorio-aberto.up.pt/handle/10216/69591
Resumo: The flow around single Taylor bubbles rising in non-Newtonian solutions of Carboxymethylcellulose (CMC) polymer was studiedusing a simultaneous technique employing particle image velocimetry (PIV) and shadowgraphy. This technique solved previousproblems on finding the correct position of the bubble interface. Solutions of different polymer weight percentage, varying from0.1 to 1.0 wt% were used to cover a wide range of flow regimes. The rheological fluid properties and pipe dimension yieldedReynolds numbers between 4 and 254 and Deborah numbers between 0.012 and 0.402. The shape of the bubbles in the differentfluids was compared. The flow around the nose of the bubbles was found to be similar in all the studied conditions. Velocityprofiles in the liquid film around the bubble were measured. Different wake structures were found in the different solutionsstudied. With increasing viscosity, the wake flow varied from turbulent to laminar, being possible to observe a negative wake forthe higher polymer concentration solutions. A comparison between the different wake structures was made.
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spelling Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurementsEngenharia química, Engenharia químicaChemical engineering, Chemical engineeringThe flow around single Taylor bubbles rising in non-Newtonian solutions of Carboxymethylcellulose (CMC) polymer was studiedusing a simultaneous technique employing particle image velocimetry (PIV) and shadowgraphy. This technique solved previousproblems on finding the correct position of the bubble interface. Solutions of different polymer weight percentage, varying from0.1 to 1.0 wt% were used to cover a wide range of flow regimes. The rheological fluid properties and pipe dimension yieldedReynolds numbers between 4 and 254 and Deborah numbers between 0.012 and 0.402. The shape of the bubbles in the differentfluids was compared. The flow around the nose of the bubbles was found to be similar in all the studied conditions. Velocityprofiles in the liquid film around the bubble were measured. Different wake structures were found in the different solutionsstudied. With increasing viscosity, the wake flow varied from turbulent to laminar, being possible to observe a negative wake forthe higher polymer concentration solutions. A comparison between the different wake structures was made.20042004-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/bookapplication/pdfapplication/pdfhttps://repositorio-aberto.up.pt/handle/10216/69591engR. G. SousaA. M. F. R. PintoM. L. RiethmullerJ. B. L. M. Camposinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-09-27T08:32:10Zoai:repositorio-aberto.up.pt:10216/69591Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-09-27T08:32:10Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
title Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
spellingShingle Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
R. G. Sousa
Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
title_short Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
title_full Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
title_fullStr Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
title_full_unstemmed Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
title_sort Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV measurements
author R. G. Sousa
author_facet R. G. Sousa
A. M. F. R. Pinto
M. L. Riethmuller
J. B. L. M. Campos
author_role author
author2 A. M. F. R. Pinto
M. L. Riethmuller
J. B. L. M. Campos
author2_role author
author
author
dc.contributor.author.fl_str_mv R. G. Sousa
A. M. F. R. Pinto
M. L. Riethmuller
J. B. L. M. Campos
dc.subject.por.fl_str_mv Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
topic Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
description The flow around single Taylor bubbles rising in non-Newtonian solutions of Carboxymethylcellulose (CMC) polymer was studiedusing a simultaneous technique employing particle image velocimetry (PIV) and shadowgraphy. This technique solved previousproblems on finding the correct position of the bubble interface. Solutions of different polymer weight percentage, varying from0.1 to 1.0 wt% were used to cover a wide range of flow regimes. The rheological fluid properties and pipe dimension yieldedReynolds numbers between 4 and 254 and Deborah numbers between 0.012 and 0.402. The shape of the bubbles in the differentfluids was compared. The flow around the nose of the bubbles was found to be similar in all the studied conditions. Velocityprofiles in the liquid film around the bubble were measured. Different wake structures were found in the different solutionsstudied. With increasing viscosity, the wake flow varied from turbulent to laminar, being possible to observe a negative wake forthe higher polymer concentration solutions. A comparison between the different wake structures was made.
publishDate 2004
dc.date.none.fl_str_mv 2004
2004-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/book
format book
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://repositorio-aberto.up.pt/handle/10216/69591
url https://repositorio-aberto.up.pt/handle/10216/69591
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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