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Rolie-Poly fluid flowing through constrictions: Two distinct instabilities

Rolie-Poly fluid flowing through constrictions: Two distinct instabilities

Reis, T. ORCID: 0000-0003-2671-416X and Wilson, H. J. (2013) Rolie-Poly fluid flowing through constrictions: Two distinct instabilities. Journal of Non-Newtonian Fluid Mechanics, 195. pp. 77-87. ISSN 0377-0257 (Print), 1873-2631 (Online) (doi:

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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.

Item Type: Article
Uncontrolled Keywords: Elastic instabilities, Rolie-Poly constitutive model, Constriction flows
Subjects: Q Science > QA Mathematics
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Faculty of Engineering & Science
Last Modified: 04 Mar 2022 13:08

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