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Viscosity and Internal Friction in Liquids

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Abstract

The point of view is substantiated, according to which the term “fluid viscosity” refers to the physical parameter characterizing the energy costs for overcoming the internal (molecular) friction forces during translational and rotational motion of solids in liquids and spatial movement (flow) of liquids themselves. It is shown that in the framework of this approach, the viscosity has a dimension J s m–3, and its numerical value depends on three parameters: the heat of evaporation of the liquid at the melting temperature, the average duration of intermolecular contacts at a given temperature and the characteristic for each liquid critical value of this parameter.

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Notes

  1. The reduction of Rcr in the addend is incorrect, since in the physical sense, the actual independent variable is precisely the product F Rcr. The numerical value F itself is correct to calculate from the equality

    $$F = {{4{\pi ^2}H{R_{{\rm{cr}}}}} \over t}\left( {{W_L} - {{\pi R_0^2{\rho _{\rm{L}}}} \over t}} \right),$$

    in which Rcr is the inner radius of the outer cylinder.

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Authors and Affiliations

  1. Ivanovo State University of Chemistry and Technology, 153000, Ivanovo, Russia

    L. N. Mizerovskiy

  2. G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 153045, Ivanovo, Russia

    P. R. Smirnov

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  1. L. N. Mizerovskiy
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  2. P. R. Smirnov
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Correspondence to L. N. Mizerovskiy or P. R. Smirnov.

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Translated from Rossiiskii Khimicheskii Zhurnal, 2020, Vol. 64, No. 1, pp. 3–12. https://doi.org/10.6060/rcj.2020641.1.

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Mizerovskiy, L.N., Smirnov, P.R. Viscosity and Internal Friction in Liquids. Russ J Gen Chem 91, 1797–1806 (2021). https://doi.org/10.1134/S1070363221090279

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