A Fast, Accurate Real Gas Equation of State for Fluid Dynamic Analysis Applications

Abstract

A modified form of the Redlich-Kwong two-parameter equation of state is presented. The modified equation employs the acentric factor and the critical point compressibility factor as additional parameters to improve its accuracy and to extend its application range to include the critical point. This modified equation is as simple as the original form, yet achieves substantially better prediction accuracy, including thermodynamic parameters such as enthalpy and entropy. Results from this equation, the original equation, and three other popular modified forms are compared with gas property data for several compounds to demonstrate its improved accuracy and increased application range. Practical application limits to the other modified forms are identified to guide current users of those methods.

Numerical study of heat and mass transfer in underexpanded sonic free jet

“…This equation is one of cubic EOSs that was developed by Aungier [18] for flows with sharp changes in pressure and temperature. In this equation, by adding coefficient c, weakness of former equations in prediction of fluid properties near the critical point was resolved.…”

“…In this equation, by adding coefficient c, weakness of former equations in prediction of fluid properties near the critical point was resolved. In Eq(4) to Eq(9) ARK EOS and its related coefficients were presented [18]:…”

“…In Eq(9),  is eccentricity factor which was used to consider the asymmetric effects of gas molecules. To calculate this factor, Eq(10) was used [18]:…”

Pyrolysis in porous media: Part 1. Numerical model and parametric study

“…Concerning the computations of real fluid properties, the modified Redlich-Kwong equation developed by Aungier 2 was chosen [49]. It is specifically developed for solving supercritical flows.…”

Modelling Combined Heat Exchange in the Leading Edge of Perspective Aircraft Wing

“…A non-steady convective heat transfer process between the real gas and wing edge was viewed. Density gradients were described with the Aungier-Redlich-Kwong equation of state [11], and the turbulent viscousity gradients with the Spalart-Allmaras model [12]. The geometrical and finite elements models are presented in Fig.…”