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A theory of the higher coefficients of the viscosity-concentration curve of a suspension of nonspherical particles is presented. Starting with the simple model of a dumbbell, the flow around a single particle and its modification due to interaction with other particles are considered. It is sho\\"n that the coefficients ai in the equation are related to each other, namely, .. . , where the k's are independent of molecular size, in agreem ent with empirical equations. An explicit value for kl is obtained that applies also to models consisting of various arrays of spheres. The variation of kl with mo lecu lar shape is disc ussed, and various factors affecting the numerical values and the validity of the last-mentioned equation are pointed out.
Robert Simha (Fri,) studied this question.