Abstract
An attempt to reconcile the different extensional experiments on the M1 fluid is presented. Provided appropriate assumptions are made for the flow history, it is found that the Oldroyd equation gives a qualitative description of the observed stresses in most of the experiments on M1. As the extensional stresses predicted by the Oldroyd equation are predominantly elastic in origin, it is more meaningful to describe them in terms of a constant elastic modulus and a relaxation time than by a wildly varying extensional viscosity.
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