The shear viscosity of Lennard-Jones fluids

Tankeshwar, K. ; Pathak, K. N. ; Ranganathan, S. (1988) The shear viscosity of Lennard-Jones fluids Journal of Physics: Condensed Matter, 21 (19). pp. 3607-3617. ISSN 0953-8984

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Expressions for the shear viscosity have been obtained using its definition involving the time integral of the stress-stress correlation function and the memory function formalism. A secant hyperbolic and a Gaussian form of the memory function have been used. The parameters appearing in the memory function are determined from the first three nonvanishing frequency moments of the stress-stress correlation function. Expressions for the moments involving triplet and quadruplet correlation functions are calculated using the superposition and a low-order decoupling approximation respectively. These results have been used to calculate the shear viscosity of Lennard-Jones fluids over a wide range of densities and temperatures. The predicted results are found to be in good agreement with recent molecular dynamic data.

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