Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1678-58782012000200008 http://hdl.handle.net/11449/9633 |
Resumo: | The dam-break flow involving non-Newtonian fluids is a type of flow commonly observed in nature as well as in common industrial processes. Experiments of non-Newtonian dam-break flows were conducted in horizontal channels and aqueous solutions of Carbopol 940 were used, which were modeled by the Herschel-Bulkley constitutive equation. Their flows were filmed and the frames were compared with numerical simulations. Two particular results were analyzed: the front wave evolution with time and its stop distance. The CFX software was employed and the simulations were conducted with the VOF method. Both results, numerical and experimental, were compared with shallow water approximation solutions found in literature. The numerical code, which uses complete momentum equations, showed better agreement with the experiments than those using shallow water equations. It seems that the hypotheses used by the shallow water approximated equations are not appropriate for the first instants of the flow, just after the dam-break and errors are introduced. Probably, these errors are propagated producing the differences encountered. |
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Repositório Institucional da UNESP |
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Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluidsdam-breakHerschel-Bulkley fluidsshallow watercomplete solutionVOFThe dam-break flow involving non-Newtonian fluids is a type of flow commonly observed in nature as well as in common industrial processes. Experiments of non-Newtonian dam-break flows were conducted in horizontal channels and aqueous solutions of Carbopol 940 were used, which were modeled by the Herschel-Bulkley constitutive equation. Their flows were filmed and the frames were compared with numerical simulations. Two particular results were analyzed: the front wave evolution with time and its stop distance. The CFX software was employed and the simulations were conducted with the VOF method. Both results, numerical and experimental, were compared with shallow water approximation solutions found in literature. The numerical code, which uses complete momentum equations, showed better agreement with the experiments than those using shallow water equations. It seems that the hypotheses used by the shallow water approximated equations are not appropriate for the first instants of the flow, just after the dam-break and errors are introduced. Probably, these errors are propagated producing the differences encountered.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidade Federal de Santa Catarina (UFSC), Dept Mech Engn, UFSC, BR-88040900 Florianopolis, SC, BrazilUNESP Paulista State Univ, Dept Civil Engn, BR-15385000 Ilha Solteira, SP, BrazilUNESP Paulista State Univ, Dept Civil Engn, BR-15385000 Ilha Solteira, SP, BrazilAbcm Brazilian Soc Mechanical Sciences & EngineeringUniversidade Federal de Santa Catarina (UFSC)Universidade Estadual Paulista (Unesp)Minussi, Roberta BrondaniMaciel, Geraldo de Freitas [UNESP]2014-05-20T13:28:52Z2014-05-20T13:28:52Z2012-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article167-178application/pdfhttp://dx.doi.org/10.1590/S1678-58782012000200008Journal of The Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro Rj: Abcm Brazilian Soc Mechanical Sciences & Engineering, v. 34, n. 2, p. 167-178, 2012.1678-5878http://hdl.handle.net/11449/9633S1678-58782012000200008WOS:000307228800008S1678-58782012000200008-en.pdf5808118510418914Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Society of Mechanical Sciences and Engineering1.6270,362info:eu-repo/semantics/openAccess2024-07-04T18:15:59Zoai:repositorio.unesp.br:11449/9633Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:59:23.639222Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
title |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
spellingShingle |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids Minussi, Roberta Brondani dam-break Herschel-Bulkley fluids shallow water complete solution VOF |
title_short |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
title_full |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
title_fullStr |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
title_full_unstemmed |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
title_sort |
Numerical Experimental Comparison of Dam Break Flows with non-Newtonian Fluids |
author |
Minussi, Roberta Brondani |
author_facet |
Minussi, Roberta Brondani Maciel, Geraldo de Freitas [UNESP] |
author_role |
author |
author2 |
Maciel, Geraldo de Freitas [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Santa Catarina (UFSC) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Minussi, Roberta Brondani Maciel, Geraldo de Freitas [UNESP] |
dc.subject.por.fl_str_mv |
dam-break Herschel-Bulkley fluids shallow water complete solution VOF |
topic |
dam-break Herschel-Bulkley fluids shallow water complete solution VOF |
description |
The dam-break flow involving non-Newtonian fluids is a type of flow commonly observed in nature as well as in common industrial processes. Experiments of non-Newtonian dam-break flows were conducted in horizontal channels and aqueous solutions of Carbopol 940 were used, which were modeled by the Herschel-Bulkley constitutive equation. Their flows were filmed and the frames were compared with numerical simulations. Two particular results were analyzed: the front wave evolution with time and its stop distance. The CFX software was employed and the simulations were conducted with the VOF method. Both results, numerical and experimental, were compared with shallow water approximation solutions found in literature. The numerical code, which uses complete momentum equations, showed better agreement with the experiments than those using shallow water equations. It seems that the hypotheses used by the shallow water approximated equations are not appropriate for the first instants of the flow, just after the dam-break and errors are introduced. Probably, these errors are propagated producing the differences encountered. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-04-01 2014-05-20T13:28:52Z 2014-05-20T13:28:52Z |
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 |
http://dx.doi.org/10.1590/S1678-58782012000200008 Journal of The Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro Rj: Abcm Brazilian Soc Mechanical Sciences & Engineering, v. 34, n. 2, p. 167-178, 2012. 1678-5878 http://hdl.handle.net/11449/9633 S1678-58782012000200008 WOS:000307228800008 S1678-58782012000200008-en.pdf 5808118510418914 |
url |
http://dx.doi.org/10.1590/S1678-58782012000200008 http://hdl.handle.net/11449/9633 |
identifier_str_mv |
Journal of The Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro Rj: Abcm Brazilian Soc Mechanical Sciences & Engineering, v. 34, n. 2, p. 167-178, 2012. 1678-5878 S1678-58782012000200008 WOS:000307228800008 S1678-58782012000200008-en.pdf 5808118510418914 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering 1.627 0,362 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
167-178 application/pdf |
dc.publisher.none.fl_str_mv |
Abcm Brazilian Soc Mechanical Sciences & Engineering |
publisher.none.fl_str_mv |
Abcm Brazilian Soc Mechanical Sciences & Engineering |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128732581330944 |