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TitleA numerical and theoretical study on viscoelastic fluid slip flows
Author(s)Ferrás, Luís Jorge Lima
Afonso, A. M.
Nóbrega, J. M.
Pinho, F. T.
Issue date2017
PublisherAmerican Institute of Physics
JournalPhysics of Fluids
Abstract(s)This work describes a theoretical and numerical investigation of viscoelastic fluid flows, considering slip boundary conditions. The viscoelastic fluid is described by the simplified Phan-Thien-Tanner model, and the governing equations with slip boundary conditions are solved by a finite volume method using (1) a recently proposed methodology to control the growth of the slip velocity along the iterative process (named the SIMPLE-slip method) where some simplifications are assumed at the wall, and also (2) a slip formulation where the complete stress tensor at the wall is taken into account. Analytical and semi-analytical solutions are also provided for the fully developed flow between parallel plates of viscoelastic fluids, assuming Thomson and Troian and Lau and Schowalter non-linear wall slip models. For verification purposes, the numerical results were compared with the analytical solution for fully developed slip-flow in a planar channel using two non-linear slip models. Simulations were carried out in a classical benchmark problem in computational rheology, the viscoelastic fluid flow in a slip-stick geometry, aiming to identify the influence of slip intensity on the flow patterns, velocity, and stress growth at the singularity region. Published by AIP Publishing.
AccessRestricted access (Author)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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