modelMaxwellLoop
show Maxwell Loops
Information
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
pandstate.p - Make
dthe independent variable of the plot - Rescale the range for
pto 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
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.Temperature | T | 0.9*Tcrit |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.Density | d | ||
| Modelica.Units.SI.SpecificVolume | v | 1/d | |
| Medium.ThermodynamicState | state | Medium.setState_dTX(d = d, T = T) | |
| Medium.EoS.HelmholtzDerivs | f | Medium.EoS.setHelmholtzDerivsThird(d = d, T = T, phase = 1) | |
| Medium.AbsolutePressure | p | Medium.EoS.p(f) | |
| Modelica.Blocks.Sources.Ramp | Ramp_dvap | ||
| Modelica.Blocks.Sources.Ramp | Ramp_dliq |
Contents
| Name | Description |
|---|---|
 Medium |