Aspen Physical Property System - Physical Property Models

References
R.C. Reid, J.M. Prausnitz, and B.E. Poling, The Properties of Gases and
Liquids, 4th ed., (New York: McGraw-Hill, 1987), p. 598–600.
Wilke-Chang (Mixture)
The Wilke-Chang model calculates the infinite-dilution liquid diffusion
coefficient of component i in a mixture.
The equation for the Wilke-Chang model is:
With:
Where:
�j = Association factor of solvent. 2.26 for water, 1.90 for
methanol, 1.50 for ethanol, 1.20 for propyl alchohols
and n-butanol, and 1.00 for all other solvents.
n l
= Mixture liquid viscosity of all nondiffusing
components. This can be obtained from the General
Pure Component Liquid Viscosity model. You must
provide parameters for one its submodels.
The parameter DLWC specifies which components diffuse. It is set to 1 for a
diffusing component and 0 for a non-diffusing component.
Parameter
Symbol Default Lower Upper Units
Name/Element
Limit Limit
MW M j — 1.0 5000.0 —
VB V bi *,l
3 Transport Property Models 287
— 0.001 3.5 MOLE-VOLUME
DLWC — 1 — — —
References
R.C. Reid, J.M. Praunsnitz, and B.E. Poling, The Properties of Gases and
Liquids, 4th ed., (New York: McGraw-Hill, 1987), p. 618.
Surface Tension Models
The Aspen Physical Property System has the following built-in surface tension
models.This section describes the surface tension models available.
Model Type
Liquid Mixture Surface Tension Liquid-vapor