Abstract
The interaction of model glass spheres in suspensions subjected to velocity gradients has been studied in detail. Absolute “inelastic” collision frequencies have been measured and found to be in excellent accord with a theory based upon simple geometrical considerations. A doublet so formed rotates as a rigid dumbbell at a known constant angular velocity, and separates at a point which is a mirror image of the initial point of contact. This memory effect persists through interruptions of motion of the suspension, a phenomenon which casts some doubt on the otherwise definite evidence of true contact of the spheres. The details of doublet rotation which have been established experimentally make it possible to calculate the mean and the maximum values of the life of a doublet, and the frequency distribution of doublet lives. Good agreement between various measured and calculated values of doublet lives has been found. Up to the instant of doublet formation, there is no measurable interaction effect upon the translational or rotational velocity of singlets at volume fractions of as high as 1.6%.
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