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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 9, p.827-835


Odinaev S.1, Abdurasulov A.2

1 Academy of Sciences of the Republic of Tajikistan
(33, Rudaki Ave., Dushanbe 734025, Tajikistan; e-mail: odsb42@mail.ru)
2 M.S. Osimi Tajik Technical University
(10, Academicians Rajabovs Str., Dushanbe 734042, Tajikistan)

Research of the Shear and Volume Viscosity Coefficients in Multiatomic Liquids and Their Dependences on the State Parameters

Section:Soft matter
Original Author's Text: Ukrainian

Abstract: The expressions for the shear, ?S (?), and volume, ?V (?), viscosity coefficients in multiatomic liquids have been obtained by solving the kinetic equations for one- and two-particle distribution functions, and their dependences on the thermodynamic state parameters have been analyzed. Numerical calculations of ?S (?) and ?V (?) are carried out for liquid N2, O2, CO, CO2, and CH4 in wide temperature, T, and density, ?, intervals, at a fixed frequency ?, and for specific choices of the intermolecular interaction potential and the radial distribution function. The validity of the law of corresponding states for viscous properties of multiatomic liquids with respect to the reduced ?? and T? values is tested. The results of theoretical calculations of the isofrequency viscosity coefficients for the examined liquids are found to be in satisfactory agreement with available experimental data.

Key words: frequency dispersion, translational and structural relaxation, shear and volume viscosity coefficients, interaction potential, radial distribution function, liquid friction coefficient.