Create a User-Defined Real Gas

• Molar mass;

• Critical pressure (Pc);

• Critical temperature (Tc);

• Critical compressibility factor (Zc);

• Redlich-Kwong equation type that should be used, i.e. the above-mentioned one or any of the following three modifications introducing the Pitzer acentric factor (ω):

  • the Wilson modification;

  • the Barnes-King modification;

  • the Soave modification.

• Acentric factor (ω) (if applicable);

• Minimum temperature (Tmin), i.e. lower temperature range limit of the gas properties' definition. Should be set at least 5...10 K higher than the triple point of the substance in question;

• Maximum temperature (Tmax), i.e. the corresponding upper temperature range. Should not be set unreasonably high (that is to say, to a value at which the dissociation of the gas becomes significant);

• Order of ideal gas heat capacity polynomial;

• Coefficients of ideal gas heat capacity polynomial, i.e. the coefficients of the aforementioned polynomial;

• Polarity (a Boolean value that govern some subtle corrections to the thermophysical properties);

• Vapor viscosity dependence on temperature, i.e. the coefficients a and n in the equation describing vapor viscosity as η = a·T n;

• Vapor thermal conductivity dependence on temperature, which includes the coefficients a and n and the choice of dependency type between linear λ = a + n·T and power-law λ = a·Tn forms;

• Liquid viscosity dependence on temperature, which includes the coefficients a and n and the choice of dependency type between power-law η =  a·Tn and exponential η = 10a(1/T – 1/n) forms;

• Liquid thermal conductivity dependence on temperature, which includes the coefficients a and n and the choice of dependency type between linear λ = a + n·T and power-law λ = a·Tn forms.

The coefficients of the user-specified dependencies for thermophysical properties should be entered only in the SI unit system, except those for the exponential form of dynamic viscosity of the liquid, which should be taken exclusively from the book Reid R.C., Prausnitz J.M., Poling B.E. (1987) The properties of gases and liquids, 4th edition, McGraw-Hill Inc., NY, USA.