Uniform flow of viscoelastic fluids past a confined falling cylinder

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Alexandre Afonso (Autor) Outra; Manuel A. Alves (Autor) FEUP; Fernando T. Pinho (Autor) FEUP; Paulo J. Oliveira (Autor) Outra

Revista

Título: Rheologica Acta

Vol. 47 Nº 3

Páginas: 325-348

ISSN: 0035-4511

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 9 Citações

ISI Web of Science

Scopus - 17 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

CORDIS: Ciências Tecnológicas

Outras Informações

ID Authenticus: P-004-0QR

DOI: 10.1007/s00397-007-0234-3

Abstract (EN): Uniform steady flow of viscoelastic fluids past a cylinder placed between two moving parallel plates is investigated numerically with a finite-volume method. This configuration is equivalent to the steady settling of a cylinder in a viscoelastic fluid, and here, a 50% blockage ratio is considered. Five constitutive models are employed (UCM, Oldroyd-B, FENE-CR, PTT and Giesekus) to assess the effect of rheological properties on the flow kinematics and wake patterns. Simulations were carried out under creeping flow conditions, using very fine meshes, especially in the wake of the cylinder where large normal stresses are observed at high Deborah numbers. Some of the results are compared with numerical data from the literature, mainly in terms of a drag coefficient, and significant discrepancies are found, especially for the constant-viscosity constitutive models. Accurate solutions could be obtained up to maximum Deborah numbers clearly in excess of those reported in the literature, especially with the PTT and FENE-CR models. The existence or not of a negative wake is identified for each set of model parameters.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 24