A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1115/1.4047057 http://hdl.handle.net/11449/195625 |
Resumo: | An experimental apparatus and a computational routine were developed and implemented in order to obtain the sessile drop images and the contact angle measurement for different fluids and surface conditions. Moreover, experimental results of heat transfer coefficients (HTCs) during pool boiling of de-ionized water (DI water), Al2O3-DI water- and Fe2O3-DI water-based nanofluids are presented in this paper. Based on these results, the effect of surface roughness and nanofluid concentration on the surface wettability, contact angle, and the heat transfer coefficient was analyzed. The experiments were performed on copper heating surfaces with different roughness values (corresponding to a smooth surface or a rough surface). The coated surfaces were produced by the nanofluid pool boiling process at two different volumetric concentrations. All surfaces were subjected to metallographic, wettability and roughness tests. For smooth surfaces, in comparison to DI water, heat transfer enhancement up to 60% is observed for both nanofluids at low concentrations. As the concentration of the nanofluid increases, the surface roughness increases and the contact angle decreases, characterizing a hydrophilic behavior. The analyses indicate that the boiling process of nanofluid leads to the deposition of a coating layer on the surface, which influences the heat transfer performance in two-phase systems. |
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A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performancepool boilingnanofluidcontact angle measurementroughnesswetted areaheat transferAn experimental apparatus and a computational routine were developed and implemented in order to obtain the sessile drop images and the contact angle measurement for different fluids and surface conditions. Moreover, experimental results of heat transfer coefficients (HTCs) during pool boiling of de-ionized water (DI water), Al2O3-DI water- and Fe2O3-DI water-based nanofluids are presented in this paper. Based on these results, the effect of surface roughness and nanofluid concentration on the surface wettability, contact angle, and the heat transfer coefficient was analyzed. The experiments were performed on copper heating surfaces with different roughness values (corresponding to a smooth surface or a rough surface). The coated surfaces were produced by the nanofluid pool boiling process at two different volumetric concentrations. All surfaces were subjected to metallographic, wettability and roughness tests. For smooth surfaces, in comparison to DI water, heat transfer enhancement up to 60% is observed for both nanofluids at low concentrations. As the concentration of the nanofluid increases, the surface roughness increases and the contact angle decreases, characterizing a hydrophilic behavior. The analyses indicate that the boiling process of nanofluid leads to the deposition of a coating layer on the surface, which influences the heat transfer performance in two-phase systems.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Sao Paulo State Univ UNESP, Sch Nat Sci & Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, BrazilFed Univ Technol Akure FUTA, Sch Engn & Engn Technol, Dept Mech Engn, PMB 704, Akure, Ondo State, NigeriaSao Paulo State Univ UNESP, Sch Nat Sci & Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, BrazilCNPq: 458702/2014-5FAPESP: 2013/15431-7FAPESP: 2017/13813-0FAPESP: 2019/02566-8AsmeUniversidade Estadual Paulista (Unesp)Fed Univ Technol Akure FUTACunha, Alex P. da [UNESP]Mogaji, Taye S.Souza, Reinaldo R. de [UNESP]Cardoso, Elaine M. [UNESP]2020-12-10T17:40:56Z2020-12-10T17:40:56Z2020-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10http://dx.doi.org/10.1115/1.4047057Journal Of Heat Transfer-transactions Of The Asme. New York: Asme, v. 142, n. 9, 10 p., 2020.0022-1481http://hdl.handle.net/11449/19562510.1115/1.4047057WOS:000562785700014Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Heat Transfer-transactions Of The Asmeinfo:eu-repo/semantics/openAccess2021-10-23T10:02:08Zoai:repositorio.unesp.br:11449/195625Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:19:18.886951Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
title |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
spellingShingle |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance Cunha, Alex P. da [UNESP] pool boiling nanofluid contact angle measurement roughness wetted area heat transfer |
title_short |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
title_full |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
title_fullStr |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
title_full_unstemmed |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
title_sort |
A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance |
author |
Cunha, Alex P. da [UNESP] |
author_facet |
Cunha, Alex P. da [UNESP] Mogaji, Taye S. Souza, Reinaldo R. de [UNESP] Cardoso, Elaine M. [UNESP] |
author_role |
author |
author2 |
Mogaji, Taye S. Souza, Reinaldo R. de [UNESP] Cardoso, Elaine M. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Fed Univ Technol Akure FUTA |
dc.contributor.author.fl_str_mv |
Cunha, Alex P. da [UNESP] Mogaji, Taye S. Souza, Reinaldo R. de [UNESP] Cardoso, Elaine M. [UNESP] |
dc.subject.por.fl_str_mv |
pool boiling nanofluid contact angle measurement roughness wetted area heat transfer |
topic |
pool boiling nanofluid contact angle measurement roughness wetted area heat transfer |
description |
An experimental apparatus and a computational routine were developed and implemented in order to obtain the sessile drop images and the contact angle measurement for different fluids and surface conditions. Moreover, experimental results of heat transfer coefficients (HTCs) during pool boiling of de-ionized water (DI water), Al2O3-DI water- and Fe2O3-DI water-based nanofluids are presented in this paper. Based on these results, the effect of surface roughness and nanofluid concentration on the surface wettability, contact angle, and the heat transfer coefficient was analyzed. The experiments were performed on copper heating surfaces with different roughness values (corresponding to a smooth surface or a rough surface). The coated surfaces were produced by the nanofluid pool boiling process at two different volumetric concentrations. All surfaces were subjected to metallographic, wettability and roughness tests. For smooth surfaces, in comparison to DI water, heat transfer enhancement up to 60% is observed for both nanofluids at low concentrations. As the concentration of the nanofluid increases, the surface roughness increases and the contact angle decreases, characterizing a hydrophilic behavior. The analyses indicate that the boiling process of nanofluid leads to the deposition of a coating layer on the surface, which influences the heat transfer performance in two-phase systems. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-10T17:40:56Z 2020-12-10T17:40:56Z 2020-09-01 |
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/10.1115/1.4047057 Journal Of Heat Transfer-transactions Of The Asme. New York: Asme, v. 142, n. 9, 10 p., 2020. 0022-1481 http://hdl.handle.net/11449/195625 10.1115/1.4047057 WOS:000562785700014 |
url |
http://dx.doi.org/10.1115/1.4047057 http://hdl.handle.net/11449/195625 |
identifier_str_mv |
Journal Of Heat Transfer-transactions Of The Asme. New York: Asme, v. 142, n. 9, 10 p., 2020. 0022-1481 10.1115/1.4047057 WOS:000562785700014 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Heat Transfer-transactions Of The Asme |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
10 |
dc.publisher.none.fl_str_mv |
Asme |
publisher.none.fl_str_mv |
Asme |
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_ |
1808129308866117632 |