This model is used to compare the curvatures of two sub-critical isotherms in the two-phase region of a p,d-plot.
One isotherm is calcualted directly from the EoS (showing some loops in the two-phase region),
one isotherm is calculated taking into account the VLE conditions (straight line in the two-phase region).
How to use:
- Simulate with
T<T_crit
- Plot
p
and state.p
- Make
d
the independent variable of the plot
- Rescale the range for
p
to something like -100 to +100
- Look at the loops
- Further reading:
- Lemmon, E. W. and Jacobsen, R. T.:
- A New Functional Form and New Fitting Techniques for Equations of State with Application to Pentafluoroethane (HFC-125).
Journal of Physical and Chemical Reference Data 34 (1) , 69-108 (2005)
DOI: 10.1063/1.1797813
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