Abstract
In this communication we consider the hydrodynamic interaction problem in dumbbell kinetic theory using the traditional Langevin analysis. The pre-averaged Oseen tensor is avoided in the formulation. It is shown that the behaviour of the dumbbell is qualitatively different from that predicted by models employing the pre-averaged Oseen tensor; the most important result is that the predicted non-Newtonian viscosity in a steady shearing flow now occurs at the experimentally observed order of magnitude of shear rate. This contrasts with the constant viscosity predicted by the pre-averaged calculation.
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