Abstract
The viscosity of suspensions of nearly uniform rigid rods has been shown to exhibit transient non‐Newtonian behavior. Damped oscillations of frequency approximately twice that of the rotation of the suspended particles occur. The attenuation of the oscillations is shown to be mainly due to polydispersity and particle interactions. Rotary Brownian motion which can also contribute to the damping was considered theoretically but shown to be negligible in our experiments. Effects of the axis ratio of the particles and the rate of shear on the damping were studied in detail, and the results were found to be in general agreement with earlier theoretical predictions.
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