Numerical simulation of abrupt contraction flows using the Double Convected Pom-Pom model

Clemeur, N., Rutgers, R. P. G. and Debbaut, B. (2004) Numerical simulation of abrupt contraction flows using the Double Convected Pom-Pom model. Journal of Non-newtonian Fluid Mechanics, 117 2-3: 193-209. doi:10.1016/j.jnnfm.2004.02.001

Author Clemeur, N.
Rutgers, R. P. G.
Debbaut, B.
Title Numerical simulation of abrupt contraction flows using the Double Convected Pom-Pom model
Journal name Journal of Non-newtonian Fluid Mechanics   Check publisher's open access policy
ISSN 0377-0257
Publication date 2004
Sub-type Article (original research)
DOI 10.1016/j.jnnfm.2004.02.001
Volume 117
Issue 2-3
Start page 193
End page 209
Total pages 17
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2004
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
780102 Physical sciences
0915 Interdisciplinary Engineering
Abstract The Double Convected Pom-Pom model was recently introduced to circumvent some numerical and theological defects found in other formulations of the Pom-Pom concept. It is used here for the simulation of a benchmark problem: the flow in an abrupt planar contraction. The predictions are compared with birefringence measurements and show reasonable quantitative agreement with experimental data. A parametric study is also carried out with the aim of analysing the effect of the branching parameter on vortex dynamics and extrudate swell. The results show that the Double Convected Pom-Pom model (DCPP) model is able to discriminate between branched and linear macromolecular structures in accordance with experimental observations. In that respect, the role of the extensional properties in determining complex flow behaviour is stressed. Also, the ratio of the first normal stress difference to the shear stress appears to play a major role in die swell observation. For the time being, the role of the second normal stress difference appears to be less obvious to evaluate in this complex flow. (C) 2004 Elsevier B.V. All rights reserved.
Keyword Mechanics
Double Convected Pom-pom
Abrupt Contraction Flow
Viscoelastic Differential Model
Numerical Simulation
Flow Birefringence
Branched Polymer Melts
Mixed Finite-element
Low-density Polyethylene
Planar Entry Flow
Viscoelastic Flow
Secondary Motions
Stagnation Flow
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
2005 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 24 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 25 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 04:28:42 EST