Aspen Physical Property System - Physical Property Models

fcn = Correlation developed by IAPS
The models are only applicable to water. No parameters are required.
Li Mixing Rule
Liquid mixture thermal conductivity is calculated using Li equation (Reid
et.al., 1987):
Where:
The pure component liquid molar volume Vi *,l is calculated from the Rackett
model.
The pure component liquid thermal conductivity �i *,l is calculated by the
General Pure Component Liquid Thermal Conductivity model.
Reference: R.C. Reid, J.M. Prausnitz, and B.E. Poling, The Properties of Gases
and Liquids, 4th ed., (New York: McGraw-Hill, 1987), p. 550.
Riedel Electrolyte Correction
The Riedel model can calculate the correction to the liquid mixture thermal
conductivity of a solvent mixture, due to the presence of electrolytes:
Where:
� l solv = Thermal conductivity of the liquid solvent mixture,
calculated by the General Pure Component Liquid
Thermal Conductivity model using the Vredeveld
mixing rule
xca a
272 3 Transport Property Models
= Mole fraction of the apparent electrolyte ca
ac, aa = Riedel ionic coefficient
Vm l
= Apparent molar volume computed by the Clarke
density model
Apparent electrolyte mole fractions are computed from the true ion molefractions
and ionic charge number. They can also be computed if you use the
apparent component approach. A more detailed discussion of this method is
found in Electrolyte Calculation.