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Author(s): Manuel António Alves
Fernando Tavares de Pinho
Paulo Jorge Oliveira
Title: Viscoelastic flow in axisymmetric contractions: The effect of contraction ratio
Issue Date: 2004
Abstract: Numerical simulations of PTT fluids in axisymmetric sudden contractions were carried out to investigate the effect ofcontraction ratio on the flow patterns under conditions of negligible inertia. The PTT model selected has a linear stress coefficient,and contraction ratios (CR) in the range 4:1 to 100:1 were investigated. The simulations are based on a finite volume methodologyusing very fine meshes and a purposely developed high-resolution scheme for the discretization of advective terms in the viscoelasticconstitutive equation. In contrast to Newtonian fluids, where the contraction ratio has no significant influence for CR larger than 4,for these shear-thinning viscoelastic fluids the corner vortex increases with flow elasticity and, of more interest, a lip vortex isformed at large contractions ratios. This lip vortex also grows with elasticity, then merges and later engulfs the corner vortex,much like the situation for plane contraction flows. In this work, maps are presented outlining regions of different vortex behaviour.
Subject: Ciências da engenharia e tecnologias
Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Source: 10th Brazilian Congress of Thermal Sciences and Engineering - EMCIT 2004
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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