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On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures

H.R. Tamaddon-Jahromi, J.E. López-Aguilar, M.F. Webster, Michael Webster Orcid Logo, Hamid Tamaddon Jahromi

Journal of Non-Newtonian Fluid Mechanics

Swansea University Authors: Michael Webster Orcid Logo, Hamid Tamaddon Jahromi

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DOI (Published version): 10.1016/j.jnnfm.2017.11.006

Abstract

This study compares and contrasts computational predictions against experimental data for some viscoelastic contraction flows. Nigen and Walters (2002) [1], provides the comparative data-set, the specific flow of interest is an 8:1 abrupt circular contraction, and the constitutive model is that of s...

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Published in: Journal of Non-Newtonian Fluid Mechanics
ISSN: 0377-0257
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa37028
Abstract: This study compares and contrasts computational predictions against experimental data for some viscoelastic contraction flows. Nigen and Walters (2002) [1], provides the comparative data-set, the specific flow of interest is an 8:1 abrupt circular contraction, and the constitutive model is that of swanINNFM(q) [swIM]. Taken against increasing flow-rate, such a model is observed to capture significant vortex-enhancement in these axisymmetric flows, reflecting well the counterpart experimental findings. In addition, rich vortex characteristics are reflected, through evolving patterns of salient-corner, lip-vortex and elastic-corner vortices. A systematic parametric analysis is conducted over three independent and governing material parameters in the model, whilst attempting to interpret rheological adjustment against such changes in flow-structure. Specifically, this has involved variation in solvent-fraction (β), finite-extensibility parameter (L), and extensional-based dissipative parameter (λD).
Keywords: Experimental data vs numerical predictions; Boger fluids; flow-structure and pressure-drop; circular contraction flow; lip-, salient- and elastic-corner vortices; swIM model
College: Faculty of Science and Engineering

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