A numerical and theoretical study on viscoelastic fluid slip flows

• Type: Article in International Scientific Journal
• Date: 2017

Authors

L. L. Ferrás (Author) Other; A. M. Afonso (Author) FEUP; J. M. Nóbrega (Author) Other; F. T. Pinho (Author) FEUP

Journal

Title: Physics of Fluids

Vol. 29 No. 5

Final page: 053102

ISSN: 1070-6631

Publisher: American Institute of Physics

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 14 Citations

INSPEC

Scientific classification

FOS: Engineering and technology

Associated Projects

MOLDPRO - Aproximações multi-escala para moldação por injeção de materiais plásticos

Other information

Authenticus ID: P-00M-WPV

DOI: 10.1063/1.4983062

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16