Numerical evaluation of three dimensional effects in planar flow birefringence

Clemeur, N., Rutgers, R. P. G. and Debbaut, B. (2004) Numerical evaluation of three dimensional effects in planar flow birefringence. Journal of Non-newtonian Fluid Mechanics, 123 2-3: 105-120. doi:10.1016/j.jnnfm.2004.07.002

Author Clemeur, N.
Rutgers, R. P. G.
Debbaut, B.
Title Numerical evaluation of three dimensional effects in planar flow birefringence
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.2004.07.002
Volume 123
Issue 2-3
Start page 105
End page 120
Total pages 16
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 influence of three dimensional effects on isochromatic birefringence is evaluated for planar flows by means of numerical simulation. Two fluid models are investigated in channel and abrupt contraction geometries. In practice, the flows are confined by viewing windows, which alter the stresses along the optical path. The observed optical properties differ therefore from their counterpart in an ideal two-dimensional flow. To investigate the influence of these effects, the stress optical rule and the differential propagation Mueller matrix are used. The material parameters are selected so that a retardation of multiple orders is achieved, as is typical for highly birefringent melts. Errors due to three dimensional effects are mainly found on the symmetry plane, and increase significantly with the flow rate. Increasing the geometric aspect ratio improve the accuracy provided that the error on the retardation is less than one order. (C) 2004 Elsevier B.V. All rights reserved.
Keyword Mechanics
Three Dimensional Effects
Double Convected Pom-pom Model
Pom-pom Model
Polymer Melts
Entry Flow
Surface Instabilities
Viscoelastic Flows
Abrupt Contraction
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 33 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 33 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 04:28:40 EST