Lower nappe aeration in smooth channels: experimental data and numerical simulation
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Anais da Academia Brasileira de Ciências (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200027 |
Resumo: | Bed aerators designed to increase air void ratio are used to prevent cavitation and related damages in spillways. Air entrained in spillway discharges also increases the dissolved oxygen concentration of the water, which can be important for the downstream fishery. This study considers results from a systematic series of measurements along the jet formed by a bed aerator, involving concentration profiles, pressure profiles, velocity fields and corresponding air discharges. The experimental results are, then, compared, with results of computational fluid dynamics (CFD) simulations with the aim of predicting the air discharge numerically. Comparisons with jet lengths and the air entrainment coefficients from the literature are also made. It is shown that numerical predictive tools furnish air discharges comparable to measured values. However, if more detailed predictions are desired, verification experiments are still necessary. |
id |
ABC-1_6c56c3e93e4f1db061ed2c4a8d8d050b |
---|---|
oai_identifier_str |
oai:scielo:S0001-37652010000200027 |
network_acronym_str |
ABC-1 |
network_name_str |
Anais da Academia Brasileira de Ciências (Online) |
repository_id_str |
|
spelling |
Lower nappe aeration in smooth channels: experimental data and numerical simulationspillway aeratorsair entrainmentair-water flowsmultiphase flowsBed aerators designed to increase air void ratio are used to prevent cavitation and related damages in spillways. Air entrained in spillway discharges also increases the dissolved oxygen concentration of the water, which can be important for the downstream fishery. This study considers results from a systematic series of measurements along the jet formed by a bed aerator, involving concentration profiles, pressure profiles, velocity fields and corresponding air discharges. The experimental results are, then, compared, with results of computational fluid dynamics (CFD) simulations with the aim of predicting the air discharge numerically. Comparisons with jet lengths and the air entrainment coefficients from the literature are also made. It is shown that numerical predictive tools furnish air discharges comparable to measured values. However, if more detailed predictions are desired, verification experiments are still necessary.Academia Brasileira de Ciências2010-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200027Anais da Academia Brasileira de Ciências v.82 n.2 2010reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652010000200027info:eu-repo/semantics/openAccessArantes,Eudes J.Porto,Rodrigo M.Gulliver,John S.Lima,Alberto C.M.Schulz,Harry E.eng2010-06-11T00:00:00Zoai:scielo:S0001-37652010000200027Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2010-06-11T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false |
dc.title.none.fl_str_mv |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
title |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
spellingShingle |
Lower nappe aeration in smooth channels: experimental data and numerical simulation Arantes,Eudes J. spillway aerators air entrainment air-water flows multiphase flows |
title_short |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
title_full |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
title_fullStr |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
title_full_unstemmed |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
title_sort |
Lower nappe aeration in smooth channels: experimental data and numerical simulation |
author |
Arantes,Eudes J. |
author_facet |
Arantes,Eudes J. Porto,Rodrigo M. Gulliver,John S. Lima,Alberto C.M. Schulz,Harry E. |
author_role |
author |
author2 |
Porto,Rodrigo M. Gulliver,John S. Lima,Alberto C.M. Schulz,Harry E. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Arantes,Eudes J. Porto,Rodrigo M. Gulliver,John S. Lima,Alberto C.M. Schulz,Harry E. |
dc.subject.por.fl_str_mv |
spillway aerators air entrainment air-water flows multiphase flows |
topic |
spillway aerators air entrainment air-water flows multiphase flows |
description |
Bed aerators designed to increase air void ratio are used to prevent cavitation and related damages in spillways. Air entrained in spillway discharges also increases the dissolved oxygen concentration of the water, which can be important for the downstream fishery. This study considers results from a systematic series of measurements along the jet formed by a bed aerator, involving concentration profiles, pressure profiles, velocity fields and corresponding air discharges. The experimental results are, then, compared, with results of computational fluid dynamics (CFD) simulations with the aim of predicting the air discharge numerically. Comparisons with jet lengths and the air entrainment coefficients from the literature are also made. It is shown that numerical predictive tools furnish air discharges comparable to measured values. However, if more detailed predictions are desired, verification experiments are still necessary. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200027 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200027 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0001-37652010000200027 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Academia Brasileira de Ciências |
publisher.none.fl_str_mv |
Academia Brasileira de Ciências |
dc.source.none.fl_str_mv |
Anais da Academia Brasileira de Ciências v.82 n.2 2010 reponame:Anais da Academia Brasileira de Ciências (Online) instname:Academia Brasileira de Ciências (ABC) instacron:ABC |
instname_str |
Academia Brasileira de Ciências (ABC) |
instacron_str |
ABC |
institution |
ABC |
reponame_str |
Anais da Academia Brasileira de Ciências (Online) |
collection |
Anais da Academia Brasileira de Ciências (Online) |
repository.name.fl_str_mv |
Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC) |
repository.mail.fl_str_mv |
||aabc@abc.org.br |
_version_ |
1754302857627041792 |