Nonintrusive investigation of large Al-kaolin fractal aggregates with slow settling velocities

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversity College London-
Autor(es): dc.contributorUniversity of Birmingham-
Autor(es): dc.creatorMoruzzi, Rodrigo B. [UNESP]-
Autor(es): dc.creatorCampos, Luiza C.-
Autor(es): dc.creatorSharifi, Soroosh-
Autor(es): dc.creatorda Silva, Pedro Grava [UNESP]-
Autor(es): dc.creatorGregory, John-
Data de aceite: dc.date.accessioned2022-02-22T00:26:53Z-
Data de disponibilização: dc.date.available2022-02-22T00:26:53Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-10-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.watres.2020.116287-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/199255-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/199255-
Descrição: dc.descriptionAlthough a combination of aggregate characteristics dictate particle settling, it is commonly assumed that large particles have higher terminal velocities. This simplifying assumption often leads to overprediction of large aggregate settling velocities which in turn negatively impacts on estimates of sedimentation clarification efficiency. Despite its importance, little attention has been given to large aggregates with slow-settling velocities. This paper addresses this gap by investigating slow-settling velocities of large, heterodisperse and multi-shape Al-kaolin aggregates using non-intrusive methods. A particle image velocimetry technique (PIV) was applied to track aggregate velocity and a non-intrusive image technique was used to determine aggregate characteristics, including size (df), three-dimensional fractal dimension (Df), density (ρf), aggregate velocity (Vexp) and Reynolds number (Re). Results showed no strict dependence of settling velocity on large aggregate size, shape and density, as Al-kaolin aggregates with the same size exhibited different settling velocities. A comparison of the results with the well-known Stokes’ law for velocity modified by a shape factor showed that the settling velocities measured here can vary from 2 to 14 fold lower than the predicted values for perfect sphere-shape aggregates with the same density and size. Furthermore, results have also shown large Al-kaolin aggregate's drag coefficient (Cd) to be around 56/Re, for average fractal aggregate sphericity of around 0.58.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionInstituto de Geociências e Ciências Exatas Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio Claro-
Descrição: dc.descriptionDepartment of Civil Environmental and Geomatic Engineering University College London, Gower St-
Descrição: dc.descriptionDepartment of Civil Engineering University of Birmingham-
Descrição: dc.descriptionPrograma de Pós-graduação em Engenharia Civil e Ambiental Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio Claro-
Descrição: dc.descriptionInstituto de Geociências e Ciências Exatas Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio Claro-
Descrição: dc.descriptionPrograma de Pós-graduação em Engenharia Civil e Ambiental Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio Claro-
Descrição: dc.descriptionFAPESP: 2017/19195-7-
Descrição: dc.descriptionCNPq: 301210/2018-7-
Idioma: dc.languageen-
Relação: dc.relationWater Research-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAggregate density-
Palavras-chave: dc.subjectFlocculation-
Palavras-chave: dc.subjectFractal dimension-
Palavras-chave: dc.subjectSedimentation-
Palavras-chave: dc.subjectSettling velocity-
Título: dc.titleNonintrusive investigation of large Al-kaolin fractal aggregates with slow settling velocities-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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