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Structural and Thermodynamic Properties of Van der Waals Fluids via a Hard-Core Sutherland Potential

  • CHEMICAL THERMODYNAMICS AND THERMOCHEMISTRY
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Abstract

The structural and thermodynamic properties of the Van der Waals fluids are determined at a wide range of densities and temperatures. For this purpose, the second-order Barker and Henderson perturbation approach is used with an effective pair intermolecular interaction model involving a hard-core repulsion coupled with an attractive tail in the Sutherland function. A developed analytical expression for the radial distribution function of hard spheres is used to account for the reference fluid contribution. A good prediction is made for calculating the static structure factor S(k), Helmholtz free energy (A), compressibility factor (Z), and isothermal compressibility (κT) for the argon and nitrogen fluids. Furthermore, the calculated results are developed when the contribution of many-body interactions is accounted for using an effective pair potential in which its intermolecular parameters are dependent on the thermodynamic states.

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ACKNOWLEDGMENTS

The financial support of the Shahrood University of Technology is gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Chemistry, Shahrood University of Technology, 36199-95161, Shahrood, Iran

    Samad Matinifard & Hossein Nikoofard

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  1. Samad Matinifard
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  2. Hossein Nikoofard
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Correspondence to Hossein Nikoofard.

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Matinifard, S., Nikoofard, H. Structural and Thermodynamic Properties of Van der Waals Fluids via a Hard-Core Sutherland Potential. Russ. J. Phys. Chem. 96, 2823–2828 (2022). https://doi.org/10.1134/S0036024422130143

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  • DOI: https://doi.org/10.1134/S0036024422130143

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