Flow Orientation in Isotropic Fluids

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Abstract
A theory of flow orientation was developed which is based on a relation giving the change in entropy accompanying molecular orientation under the influence of a stress field, and on the applicability of the Eyring theory of viscous flow. The proposed theory predicts the ratio of the viscosity at attainment of complete orientation to the viscosity of ``normal'' i.e., random flow to be equal to the ratio of the average length v⅓ to the actual length of the (fully stretched) molecule. The thermodynamics of a flow‐oriented system are outlined, predicting the temperature changes, accompanying adiabatic orientation and disorientation. It is also suggested that the relaxation times in viscous media are large enough to prevent observation of flow orientation in capillary viscosimeters in many cases.

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