Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/105168
Author(s): V. M. Ribeiro
P. M.Coelho
F. T.Pinho
M. A. Alves
Title: Viscoelastic fluid flow past a confined cylinder: Three-dimensional effects and stability
Issue Date: 2014
Abstract: The flow of viscoelastic fluids past a confined cylinder in a rectangular duct was investigated experimentally and numerically in order to assess the three-dimensional effects associated with cylinderaspect ratio (AR) and the fluid rheology. The blockage ratio was 50%, the cylinder aspect ratios wereARŒ16, 8 and 2, and the flow conditions tested varied from creeping flow conditions up to the onset oftime-dependent flow. Three viscoelastic fluids were tested, namely a shear-thinning and two Bogerfluids, and the results were compared against the numerical and experimental data for Newtonian fluids.For the shear-thinning fluid, and in the range of Deborah numbers (De) studied (0.025oDeo0.99),elastic instabilities appear upstream of the cylinder above a critical Deborah number, that depends onthe aspect ratio. In contrast, for the Boger fluids the flow remained symmetric both upstream anddownstream of the cylinder in the range of Deborah numbers studied (Deo1.3). For all non-Newtonianfluids studied, the streamwise velocity profiles show that the length required to achieve the fullydeveloped velocity downstream of the cylinder increases with De and AR.
Subject: Ciências da engenharia e tecnologias
Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
URI: https://repositorio-aberto.up.pt/handle/10216/105168
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EME-MFE/114322/2009/EXTENSION - Escoamento extensional de fluidos complexos em microcanais/EXTENSION
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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