Abstract
A new, theoretically more satisfactory, definition for relative viscosities of suspensions in generalized Newtonian media is presented, which according to the viscosities of suspensions and pure liquids should be compared to equal averaged squared strain rates γ2L in the liquid phases. Comparison of this quantity (ηLr) is made with two definitions currently in use, in which viscosities are compared either at equal macroscopic stresses τ or at equal macroscopic squared strain rates γ2m. Interrelations between the three different relative viscosities have been derived in the case of dilute suspensions of particles of arbitrary shape in generalized Newtonian liquids. Values for limiting viscosity number (Einstein coefficients KE) have been derived from experimental data on suspension viscosities both as obtained by the authors and as obtained from other sources. The data cover suspensions of spherical particles in liquids with power‐law exponents n between 0.07 and 1.0. According to the new definition the ...
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