Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
Autor(a) principal: | |
---|---|
Data de Publicação: | 2004 |
Outros Autores: | , , |
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/10216/69617 |
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. |
id |
RCAP_7cfa1fe874a1dde0bfea328ff509a5cd |
---|---|
oai_identifier_str |
oai:repositorio-aberto.up.pt:10216/69617 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
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:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-29T15:22:55Zoai:repositorio-aberto.up.pt:10216/69617Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:22:13.244392Repositório 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 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: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 |
|
_version_ |
1799136138248585216 |