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Effect of constitutive models on the numerical simulation of viscoelastic flow at an entry region
Author(s) -
Loh K. W. L.,
Tay A. A. O.,
Teoh S. H.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10594
Subject(s) - constitutive equation , viscoelasticity , computer simulation , mechanics , contraction (grammar) , materials science , flow (mathematics) , thermodynamics , physics , finite element method , composite material , medicine
The poor solutions of numerical simulations at a contraction has often been attributed to the numerical scheme used. However, the solution of a numerical simulation is also highly dependent on the constitutive equation. A study of various constitutive equations on the simulation of the 4:1 contraction flow is made in this paper, and their effects on the results analyzed. The constitutive models considered include the Upper Convected Maxwell model, the Oldroyd‐B model, the White‐Metzner model, the Phan‐Thien‐Tanner model and the Giesekus‐Leonov model. It was found that although the Phan‐Thien‐Tanner model gave the best results, the solution at higher shear rates were still not satisfactory.