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PHI_I_PR
PHI_I_PR(N, i, Z, y[1..N], A[1..N], B[1..N], k[1..N,1..N]) returns the partial fugacity coefficient (ratio of partial fugacity to product of mole fraction and pressure) component i in a mixture according to the Peng-Robinson equation of state. Use function PHI_PR to determine the fugacity coefficient for a pure fluid.
The parameters in this function are:
N is the number of fluids in the mixture where N is between 2 and 10
i is the number of the component for which the partial fugacity is to be evaluated
Z is the compressibility for the liquid or vapor phase for which the partial fugacity is to be evaluated
y[1..N] is an array of N values that are the mole fractions of the N components for the liquid or vapor phase. Note that the sum of the mole fraction should be 1.0.
A[1..N] is an array of N values corresponding to the A parameters for each of the N pure fluids. These values are provided by AB_PR.
B[1..N] is an array of N values corresponding to the B parameters for each of the N pure fluids. These values are provided by AB_PR.
k[1..N,1..N] is the binary interaction matrix. Note that k[i,i] should be 0 and k[i,j] should be equal to k[j,i].
Note that Z is determined by functions Z_G_PR and Z_L_PR and A[1..N] and B[1..N] are provided by procedure AB_PR for each of the N pure fluids.