Abstract
Flow experiments with a capillary rheometer using 0.3% polyacrylamide and 0.75% polyox aqueous solutions were performed to study flow development and end effects generated by polymer solutions of flexible macromolecules. Several L/D capillary ratios were employed, and a method proposed recently was used to evaluate the corrections due to end effects. The corrections obtained are of the same order of magnitude than those obtained using the Bagley method, but the Bagley corrections have much larger uncertainties. The recently proposed method is superior to the Bagley method when accurate end effects are required, as for correlations with elasticity or to evaluate numerical predictions for the flow behavior of these fluids.
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