An equation of state from a new coordination number model

Abstract

A new coordination number model for square-well fluid is proposed in this work. This model agrees with the theoretical approximation at low densities. It is also in good agreement with the Monte Carlo computer simulation results for square-well fluids at the high density and the close-packed regions. This new coordination number model is compared with other models from literature and better results are observed from this work, especially at the high density region. An equation of state is derived from this new coordination number model and is written in a perturbed hard sphere form. This equation of state gives satisfactory calculated compressibility factors in comparison with the Monte Carlo computer simulation results of the square-well fluids. This 3-parameter equation of state is employed also for real fluid calculations. Pure component parameters for n-paraffins are regressed and presented. This equation of state yields satisfactory calculation results on vapor pressures and liquid densities.