The apparent viscosity of nematic p-azoxyanisole in Poiseuille flow at 122°C is calculated by numerically solving the differential equation derived by Atkin which is based on the continuum theory of Ericksen and Leslie for nematic liquid crystals. The theory requires knowledge of seven independent material properties, which are determined from experimental measurements of Miesowicz, Marinin and Zwetkoff, Zwetkoff, and the Orsay Liquid Crystal Group. Parodi's relation is used to show that in cases where there are conflicting data, some data are inconsistent with Onsager's reciprocal relation. The calculations are compared with the Poiseuille flow experiments of Fisher and Fredrickson.
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Tseng et al. (1972) studied this question.
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