Equation (4) can be rewritten in terms of the compressibility factor
The specific terms and coefficients were determined by calculating a set of compressibility factor
values distributed in (p, T) space with the REFPROP (7) implementation of Eq.
3]/ mol Z compressibility factor
Greek Symbols [delta] fluid specific constant [epsilon] fluid specific constant [tau] reduced temperature function [omega] acentric factor [zeta] molar fraction Subscripts B Boyle c critical f liquid phase g vapour phase m mixture inv inversion nbp normal boiling point r reduced sat saturation
Introduction of Compressibility Factor
Z in Baldwin et al.
Dry air property equations were developed based on the ideal gas model and the compressibility factor
and virial contributions calculated by means of polynomial correlations as functions of pressure and temperature.
The physical part of the compressibility factor
ext], the compressibility factor
, [gamma], and the slip coefficients on the tube wall.
Equations 3 and 4 constitute the second iterative loop of this model and solution results, in particular the compressibility factor
, are functions of temperature and pressure.
In fact, the compressibility factor
(Z) determines the amount of deviation from the behaviour of real flow rate, considering the behaviour of ideal flow rate.
g] is the molar gas constant, and Z is the compressibility factor
f] are the mass of the solute cylinder before and after the filling, M is the molar mass of the gas, R is the gas constant, Z is the compressibility factor
of the gas, and [m.
The compressibility factor
for natural gas is determined using the AGA 8 Thermodynamic Database .