Benchmark solutions for the flow of Oldroyd-B and PTT fluids in planar contractions

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

Manuel Moreira Alves (Autor) FEUP; P. J. Oliveira (Autor) Outra; Fernando Tavares de Pinho (Autor) FEUP

Revista

Título: Journal of Non-Newtonian Fluid Mechanics

Vol. 110 Nº 1

Páginas: 45-75

ISSN: 0377-0257

Editora: Elsevier

Indexação

ISI Web of Knowledge - 147 Citações

ISI Web of Science

Scopus - 172 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: P-000-HQW

DOI: 10.1016/s0377-0257(02)00191-x

Abstract (EN): The paper presents very accurate numerical results for the vortex size, the vortex intensity and the Couette correction, in planar contraction flows of Oldroyd-B and PTT fluids (epsilon = 0.25) with both the linear and the exponential stress function, and with a solvent viscosity ratio equal to 1/9. The accuracy of these results is quantified, being generally below 1% (0.3% for most results), and the finest mesh employed had over I million degrees of freedom. Such degree of mesh fineness is shown to be required for accurate results with the Oldroyd-B fluid, especially at high Deborah numbers, but the shear-thinning PTT fluid in general does not require the finest meshes. In terms of level of elasticity, steady results for the PTT fluid could be obtained for values of the Deborah number in excess of 100 (linear PTT) and 10,000 (exponential PTT).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 31