Absorbance photometric technique to measure roll waves in a free surface of a non-Newtonian fluid flow

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorSanto André Foundation University Center-
Autor(es): dc.contributorSanto André-
Autor(es): dc.creatorda Cunha, Evandro Fernandes-
Autor(es): dc.creatorde Oliveira Ferreira, Fabiana-
Autor(es): dc.creatorde Freitas Maciel, Geraldo-
Autor(es): dc.creatorKitano, Cláudio-
Data de aceite: dc.date.accessioned2025-08-21T20:51:03Z-
Data de disponibilização: dc.date.available2025-08-21T20:51:03Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-08-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.measurement.2024.114880-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/303240-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/303240-
Descrição: dc.descriptionThis work aims to measure forced steady roll waves evolving non-Newtonian fluid flow by using absorbance photometric technique. Instabilities on the free surface of the uniform flow were induced by controlled air pulses, generating roll waves under specific conditions of Froude number and disturbance frequency. A systematic procedure was presented to clarify a compromise between the aqueous concentrations of Carbopol (with adequate viscosity) and methylene blue dye (avoiding optical opacity), providing both sensitivity and resolution for absorbance measurements. Roll waves amplitudes were also measured using an ultrasonic sensor in order to compare the results with the absorbance photometric technique. Given a channel inclination, six scenarios defined by different flow rates were tested, which allowed us to observe the generation of roll waves as a succession of shocks. The measured profiles showed a better precision (maximum error of 0.11 mm against 1.37 mm, for pump rotation equal to 475 RPM) using the absorbance photometric technique compared to the ultrasonic system, respectively.-
Descrição: dc.descriptionSão Paulo State University Engineering College of Ilha Solteira, SP-
Descrição: dc.descriptionSanto André Foundation University Center, SP-
Descrição: dc.descriptionFederal University of ABC Santo André-
Descrição: dc.descriptionSão Paulo State University Engineering College of Ilha Solteira, SP-
Idioma: dc.languageen-
Relação: dc.relationMeasurement: Journal of the International Measurement Confederation-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAbsorbance-
Palavras-chave: dc.subjectFlow-
Palavras-chave: dc.subjectFree surface-
Palavras-chave: dc.subjectNon-Newtonian fluid-
Palavras-chave: dc.subjectPhotometric technique-
Palavras-chave: dc.subjectRoll waves-
Palavras-chave: dc.subjectShock waves-
Palavras-chave: dc.subjectUltrasonic system-
Título: dc.titleAbsorbance photometric technique to measure roll waves in a free surface of a non-Newtonian fluid flow-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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