Reis, T;
Wilson, HJ;
(2013)
Rolie-Poly fluid flowing through constrictions: Two distinct instabilities.
Journal of Non-Newtonian Fluid Mechanics
, 195
77 - 87.
10.1016/j.jnnfm.2013.01.002.
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Abstract
Elastic instabilities of entangled polymer melts are common in industrial processes but the physics responsible is not well understood. We present a numerical linear stability study of a molecular based constitutive model which grants us physical insight into the underlying mechanics involved. Two constriction flows are considered – one shear dominated, the other extension dominated – and two distinct instabilities are found. The influence of the molecular structure and the behaviour of the polymer dynamics are investigated and in both cases chain relaxation and orientation play a crucial role. This suggests a molecular-based physical interpretation of the underlying mechanisms responsible for flow instabilities.
| Type: | Article |
|---|---|
| Title: | Rolie-Poly fluid flowing through constrictions: Two distinct instabilities |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jnnfm.2013.01.002 |
| Publisher version: | http://dx.doi.org/10.1016/j.jnnfm.2013.01.002 |
| Language: | English |
| Additional information: | This is the author’s version of a work that was accepted for publication in Journal of Non-Newtonian Fluid Mechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Non-Newtonian Fluid Mechanics, [VOL 195,(May 2013)] DOI: 10.1016/j.jnnfm.2013.01.002 |
| Keywords: | Elastic instabilities, Rolie-Poly constitutive model, Constriction flows |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1396060 |
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