Contents - Index - Previous - Next
PHI_PR
PHI_PR(Z, A, B) returns the fugacity coefficient (ratio of fugacity to pressure) for a pure fluid or for a entire mixture that obeys the Peng-Robinson equation of state. Use function PHI_I_PR to determine the partial fugacity coefficient for a component in a mixture.
Note that Z is determined by functions Z_G_PR and Z_L_PR and A and B are provided by procedure AB_PR and AB_MIX_PR for pure fluids and mixtures, respectively.
Example:
Tr=0.85
Pr=0.5
omega=0.05
Call AB_PR(Tr, Pr, omega: A,B)
Z_G=Z_G_PR(A,B)
phi=PHI_PR(Z_G,A,B)
{Solution:
A=0.3391
B=0.04576
omega=0.05
phi=0.714
Pr=0.5
R=8.314 [kJ/kmol-K]
Tr=0.85
Z_G=0.5748}