Abstract
The distribution of orbits of rods and discs was determined experimentally and, as expected, was found to differ from predictions based upon the assumptions of Jeffery and of Eisenschitz. In dilute suspensions of rods the distribution of orbits was independent of concentration, but at higher concentrations it shifted in the direction of higher orbits. The time-average distribution of orbits based on prolonged observation of a single particle was the same as the number average based on an instantaneous measurement of many particles. The measured distributions of orientations φ i were in good agreement with equations developed previously. Measured values of the mean projected area of discs and length of rods in the suspensions compared favorably with the values calculated from the distributions of orbit constants. The significance of the data with reference to the viscosity of suspensions is discussed.
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