Aspen Physical Property System - Physical Property Models

Parameter
Name/Element
3 Transport Property Models 281
Symbol Default MDS Lower
Limit
Upper
Limit
MW M i — — 1.0 5000.0 —
Units
TCTRAP T ci TC x 5.0 2000.0 TEMPERATURE
PCTRAP p ci PC x 10 5
10 8
PRESSURE
VCTRAP V ci VC x 0.001 3.5 MOLE-VOLUME
ZCTRAP Z ci ZC x 0.1 1.0 —
OMGRAP � i
References
OMEGA x -0.5 3.0 —
J.F. Ely and H.J. M. Hanley, "Prediction of Transport Properties. 2. Thermal
Conductivity of Pure Fluids and Mixtures," Ind. Eng. Chem. Fundam., Vol. 22,
(1983), pp. 90–97.
Wassiljewa-Mason-Saxena Mixing Rule
The vapor mixture thermal conductivity at low pressures is calculated from
the pure component values, using the Wassiljewa-Mason-Saxena equation:
Where:
�i *,v = Calculated by the General Pure Component Vapor
Thermal Conductivity model
�i *,v (p = 0) = Obtained from the General Pure Component Vapor
Viscosity model
You must supply parameters for �i *,v (p = 0) and �i *,v .
Parameter
Name/Element
Symbol Default MDS Lower
Limit
Upper
Limit
MW M i — — 1.0 5000.0 —
References
Units
R.C. Reid, J.M. Prausnitz, and B.E. Poling, The Properties of Gases and
Liquids, 4th ed., (New York: McGraw-Hill, 1987), pp. 530–531.
Diffusivity Models
The Aspen Physical Property System has seven built-in diffusivity models. This
section describes the diffusivity models available.