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“Exact” solutions for the Hookean and FENE dumbell models with internal viscosity have been found using Brownian dynamics simulations. Results from these two dumbbell models are compared to Liang and Mackay's experimental data on semidilute xanthan gum solutions. We find that the FENE dumbbell model predicts very well Liang and Mackay's measurements on the dissipative and elastic contributions to...