Abstract

Falling ball rheometry measurements of the apparent relative viscosity of suspensions of randomly oriented rodlike particles are reported for rods having a wide range of aspect ratios and concentrations. These data, combined with those from earlier studies [Milliken et al., J. Fluid Mech. 202, 217 (1989); Powell et al., J. Rheology 33, 1173 (1989)], provide a master curve describing the apparent viscosity in terms of a single parameter, nL3, where L is the length of the particle and n is the number density.

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