3.4.3 dranchuck_abou_kassem - Dranchuk & Abou-Kassem equation of state

z = dranchuck_abou_kassem(ppr, tpr)

Computes the compressebility factor using the Dranchuk & Abou-Kassem method using the pseudo-reduced pressure and temperature.

Please note that this equation can be numerically unstable and as such results should be verified.

Arguments

ppr

Pseudo-reduced pressure .

tpr

Pseudo-reduced temperature .

Returns Compressebility factor .

Possible Errors

Dranchuk-Abou-Kassem converged improperly

The resulting compressebility factor is not plausible.