The Oldroyd-B model has been used extensively to predict a host of instabilities in shearing flows viscoelastic fluids, often realized experimentally using polymer solutions. present review, written on the occasion birth centenary James Oldroyd, provides an overview found across major classes flows. These comprise (i) canonical rectilinear including plane Couette, and pipe Poiseuille flows; (ii...

A new viscometric technique, capable of detecting DNA strand breaks and alkali-labile sites by monitoring time-dependent changes of DNA-reduced viscosity, has been used to analyze dose-response curves for the induction of DNA damage in liver of rats treated with single p.o. doses of sixteen N-nitroso compounds. Statistically significant changes of DNA viscometric parameters, which are considere...

II. Relaxation Time and the Deborah Number NB In what follows we use viscometric information from Note I ( Fluid Rheology). To determine the Deborah number for the axisymmetric contraction-expansion we need to select both a characteristic timescale for the flow and a representative measure of the spectrum of relaxation times of the fluid. A characteristic strain rate based on the local flow con...