Aspen Physical Property System - Physical Property Models

Where:
wi = Liquid phase weight fraction of component i
�i *,l = Pure component liquid thermal conductivity of component i
Where n is determined from two option codes on model KL2VR:
If option code 1 is Then n is determined by
0 (default) Option code 2, always
1
If option code 2 is Then n is
0 (default) -2
1 0.4
280 3 Transport Property Models
Option code 2, unless . In this case n is
set to 1.
2 1 (This uses a weighted average of liquid thermal
conductivities.)
For most systems, the ratio of maximum to minimum pure component liquid
thermal conductivity is between 1 and 2, where the exponent -2 is
recommended, and is the default value used.
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 T.K. Sherwood, The Properties of
Gases and Liquids, 4th ed., (New York: McGraw-Hill, 1977), p. 533.
TRAPP Thermal Conductivity Model
The general form for the TRAPP thermal conductivity model is:
Where:
Cpi *,ig
= Mole fraction vector
= Ideal gas heat capacity calculated using the
General pure component ideal gas heat capacity
model
fcn = Corresponding states correlation based on the
model for vapor and liquid thermal conductivity
made by the National Bureau of standards (NBS,
currently NIST)
The model can be used for both pure components and mixtures. The model
should be used for nonpolar components only.