Flow in the annular film around a Taylor bubble rising through vertical columns of liquid

Detalhes bibliográficos
Autor(a) principal: S. Nogueira
Data de Publicação: 2004
Outros Autores: M. L. Riethmuller, J. B. L. M. Campos, A. M. F. R. Pinto
Tipo de documento: Livro
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: https://repositorio-aberto.up.pt/handle/10216/69617
Resumo: The flow in the annular film around individual Taylor bubbles rising trough stagnant and co-current vertical columns ofliquid was studied employing simultaneously particle image velocimetry (PIV) and pulsed shadowgraphy (PST). Thiscombined allows the simultaneous determination of the bubble interface position and the velocity profiles in the liquid film.Experiments were performed with aqueous glycerol solutions in a wide range of viscosities (2x10-3 Pa.s < µ < 0.22 Pa.s), inan acrylic column of 32 mm I.D.The results show that from the nose, the liquid film accelerates and below a certain distance stabilises in velocity and inthickness, becoming a free falling film. Values for the developing length and for the film thickness are reported for theexperimental studied conditions. Average velocity profiles in the fully developed region are also presented. A criticalReynolds number (based on the mean absolute velocity in the liquid film) around 400 is reported for the transition fromlaminar to turbulent regime.
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spelling Flow in the annular film around a Taylor bubble rising through vertical columns of liquidEngenharia química, Engenharia químicaChemical engineering, Chemical engineeringThe flow in the annular film around individual Taylor bubbles rising trough stagnant and co-current vertical columns ofliquid was studied employing simultaneously particle image velocimetry (PIV) and pulsed shadowgraphy (PST). Thiscombined allows the simultaneous determination of the bubble interface position and the velocity profiles in the liquid film.Experiments were performed with aqueous glycerol solutions in a wide range of viscosities (2x10-3 Pa.s < µ < 0.22 Pa.s), inan acrylic column of 32 mm I.D.The results show that from the nose, the liquid film accelerates and below a certain distance stabilises in velocity and inthickness, becoming a free falling film. Values for the developing length and for the film thickness are reported for theexperimental studied conditions. Average velocity profiles in the fully developed region are also presented. A criticalReynolds number (based on the mean absolute velocity in the liquid film) around 400 is reported for the transition fromlaminar to turbulent regime.20042004-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/bookapplication/pdfhttps://repositorio-aberto.up.pt/handle/10216/69617engS. NogueiraM. L. RiethmullerJ. B. L. M. CamposA. M. F. R. Pintoinfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-02-27T19:45:35Zoai:repositorio-aberto.up.pt:10216/69617Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T23:30:59.093309Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
title Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
spellingShingle Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
S. Nogueira
Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
title_short Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
title_full Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
title_fullStr Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
title_full_unstemmed Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
title_sort Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
author S. Nogueira
author_facet S. Nogueira
M. L. Riethmuller
J. B. L. M. Campos
A. M. F. R. Pinto
author_role author
author2 M. L. Riethmuller
J. B. L. M. Campos
A. M. F. R. Pinto
author2_role author
author
author
dc.contributor.author.fl_str_mv S. Nogueira
M. L. Riethmuller
J. B. L. M. Campos
A. M. F. R. Pinto
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 in the annular film around individual Taylor bubbles rising trough stagnant and co-current vertical columns ofliquid was studied employing simultaneously particle image velocimetry (PIV) and pulsed shadowgraphy (PST). Thiscombined allows the simultaneous determination of the bubble interface position and the velocity profiles in the liquid film.Experiments were performed with aqueous glycerol solutions in a wide range of viscosities (2x10-3 Pa.s < µ < 0.22 Pa.s), inan acrylic column of 32 mm I.D.The results show that from the nose, the liquid film accelerates and below a certain distance stabilises in velocity and inthickness, becoming a free falling film. Values for the developing length and for the film thickness are reported for theexperimental studied conditions. Average velocity profiles in the fully developed region are also presented. A criticalReynolds number (based on the mean absolute velocity in the liquid film) around 400 is reported for the transition fromlaminar to turbulent regime.
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/10216/69617
url https://repositorio-aberto.up.pt/handle/10216/69617
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
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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