A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance

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dc.contributor.authorCunha, Alex P. da [UNESP]
dc.contributor.authorMogaji, Taye S.
dc.contributor.authorSouza, Reinaldo R. de [UNESP]
dc.contributor.authorCardoso, Elaine M. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFed Univ Technol Akure FUTA
dc.date.accessioned2020-12-10T17:40:56Z
dc.date.available2020-12-10T17:40:56Z
dc.date.issued2020-09-01
dc.description.abstractAn 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.en
dc.description.affiliationSao Paulo State Univ UNESP, Sch Nat Sci & Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationFed Univ Technol Akure FUTA, Sch Engn & Engn Technol, Dept Mech Engn, PMB 704, Akure, Ondo State, Nigeria
dc.description.affiliationUnespSao Paulo State Univ UNESP, Sch Nat Sci & Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 458702/2014-5
dc.description.sponsorshipIdFAPESP: 2013/15431-7
dc.description.sponsorshipIdFAPESP: 2017/13813-0
dc.description.sponsorshipIdFAPESP: 2019/02566-8
dc.format.extent10
dc.identifierhttp://dx.doi.org/10.1115/1.4047057
dc.identifier.citationJournal Of Heat Transfer-transactions Of The Asme. New York: Asme, v. 142, n. 9, 10 p., 2020.
dc.identifier.doi10.1115/1.4047057
dc.identifier.issn0022-1481
dc.identifier.urihttp://hdl.handle.net/11449/195625
dc.identifier.wosWOS:000562785700014
dc.language.isoeng
dc.publisherAsme
dc.relation.ispartofJournal Of Heat Transfer-transactions Of The Asme
dc.sourceWeb of Science
dc.subjectpool boiling
dc.subjectnanofluid
dc.subjectcontact angle measurement
dc.subjectroughness
dc.subjectwetted area
dc.subjectheat transfer
dc.titleA Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performanceen
dc.typeArtigo
dcterms.rightsHolderAsme

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