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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:https://doi.org/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.

Item Type: Article
Uncontrolled Keywords: Elastic instabilities, Rolie-Poly constitutive model, Constriction flows
Subjects: Q Science > QA Mathematics
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
Last Modified: 13 Apr 2019 23:13
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/23342

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