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• W2079148922 abstract "High-resolution laser Doppler velocimetry and flow-induced birefringence measurements were used to determine velocity and stress fields and to calculate a transient planar elongation viscosity profile for viscoelastic flow on the shear-free centerplane of a planar contraction geometry. A novel, two-component Boger fluid was developed that enabled Weissenberg numbers, We, as high as 2.9 to be attained and allowed the stress-optical coefficients of the fluid components to be measured. The experimental apparatus was designed to subject the fluid traveling on the centerplane to Hencky strains, ε, as great as 3.5. Despite the high We and ε, the flow induced only a weakly nonlinear viscoelastic stress response in the fluid. A spectral decomposition of predictions of linear and nonlinear constitutive equations was used to demonstrate that the weakly nonlinear response was a result of the nonhomogeneous form of the centerplane strain-rate profile in conjunction with the finite response time of the individual relaxation modes. The degree of nonlinear stress response in this experiment cannot be increased by increasing the contraction ratio to increase the total Hencky strain experienced by a fluid element traveling along the centerplane, increasing the flow rate to increase the strain rate at a given point along the centerplane, or introducing a taper to the contraction geometry to change the strain rate profile. Thus, the experimental configuration of flow through a contraction appears to be of limited value in evaluating the accuracy of nonlinear constitutive models in predicting the stress response of a viscoelastic polymer solution to a generalized elongational flow." @default.
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• W2079148922 date "2003-11-01" @default.
• W2079148922 modified "2023-10-16" @default.
• W2079148922 title "Comparison of measured centerplane stress and velocity fields with predictions of viscoelastic constitutive models" @default.
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• W2079148922 doi "https://doi.org/10.1122/1.1608951" @default.
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