Abstract
Monodisperse sols of β-FeOOH crystals are used for the detection and structural analysis of vortices formed prior to the transition of laminar into turbulent flow, the experimental tools used being both characteristic qualitative periodicities observed in flow light scattering and quantitative variations in its intensity as a function of shear rate. The proportionality between viscosity and initial shear rate, expressed in the classical equation of Taylor, is taken advantage of for the determination of viscosities in dilute dispersed systems using discontinuities in flow light scattering at the critical shear rate as a very sensitive argument which is under certain circumstances applicable also to dispersions of spherical particles.
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