Journal article

An approximate solution to flow through a contraction for high Trouton ratio fluids

AS Lubansky, DV Boger, C Servais, AS Burbidge, JJ Cooper-White

JOURNAL OF NON-NEWTONIAN FLUID MECHANICS | ELSEVIER SCIENCE BV | Published : 2007

Abstract

An approximate analytical solution is presented to predict the flow, vortex and pressure drop behaviour in abrupt axisymmetric contractions. This solution is developed to identify the effect of fluids which exhibit large Trouton ratios at large extensional rates despite having a constant shear viscosity. This behaviour approximates that shown in dilute polymeric solutions, although any transient effects are neglected by removing any strain dependence of the extensional viscosity and by assuming that the steady-state extensional viscosity undergoes a step change from a Trouton ratio of 3 to a large Trouton ratio at a critical rate. The predictions compare well to available experimental result..

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University of Melbourne Researchers