Abstract
A new technique for investigating some of the rheological properties of slurries is proposed. A commercial concentric cylinder viscometer was modified so that a continuous coaxial flow could be superimposed on the Couette flow; this eliminated the influence of sedimentation of the solid particles. The influence of the changed strain was measured and found to be small. Relations between the shear stress and shear rate, temperature, mass fraction of solids and particle size were determined for a coal-oil slurry. The power-law coefficients were calculated. The influence of solid particles on the power-law coefficientskm andnm was determined and approximated by empirical equations.
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