Abstract
BEFORE and during the War, investigations were reported on the viscosity of anisotropic liquids1,2,3,4. As is well known, the flow of an anisotropic liquid influences the orientation of the molecules. On the other hand, the value of the viscosity coefficient depends on this orientation. Therefore this coefficient is a function of the velocity-gradient, and the usual definition of the viscosity coefficient for these liquids loses its significance. If under the influence of any factor the molecules of the liquid should be orientated in one direction and the motion is unable to change this orientation, then we have the viscosity coefficient in the ordinary sense. But in this case we have to deal with the anisotropy of the viscosity, and in case of a liquid of the type of p-azoxyanisol we have three principal viscosity coefficients belonging to the three directions of orientation ; these are : (1) direction of the flow ; (2) direction of the velocity gradient ; (3) perpendicular to both these directions. Having given the molecules an orientation by means of a magnetic field in such circumstances that the flow did not change this orientation, I obtained the following values for the three principal viscosity coefficients for p-azoxyanisol and p-azoxyphenetol2.
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References
Miesowicz, M., Nature, 136, 261 (1935).
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Zwetkoff, W. N., and Michajlow, G. M., Acta Phisicochim. URSS., 8, 77 (1938).
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Landoldt-Börnstein, I., Erg. Bd. (1927).
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MIESOWICZ, M. The Three Coefficients of Viscosity of Anisotropic Liquids. Nature 158, 27 (1946). https://doi.org/10.1038/158027b0
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DOI: https://doi.org/10.1038/158027b0
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