Aspen Physical Property System - Physical Property Models

Model Type
Aspen Liquid Mixture Viscosity Liquid
ASTM Liquid Mixture Viscosity Liquid
Twu liquid viscosity Liquid
Viscosity quadratic mixing rule Liquid
Andrade Liquid Mixture Viscosity
The liquid mixture viscosity is calculated by the modified Andrade equation:
Where:
kij
mij
3 Transport Property Models 247
=
=
fi depends on the option code for the model MUL2ANDR.
If first option code of
Then fi is
MUL2ANDR is
0 (Default) Mole fraction of component i
1 Mass fraction of component i
Note that the Andrade liquid mixture viscosity model is called from other
models. The first option codes of these models cause fi to be mole or mass
fraction when Andrade is used in the respective models. To maintain
consistency across models, if you set the first option code for MUL2ANDR to
1, you should also the set the first option code of the other models to 1, if
they are used in your simulation.
Model Model Name
MUL2JONS Jones-Dole Electrolyte Viscosity model
DL0WCA Wilke-Chang Diffusivity model (binary)
DL1WCA Wilke-Chang Diffusivity model (mixture)
DL0NST Nernst-Hartley Electrolyte Diffusivity model (binary)
DL1NST Nernst-Hartley Electrolyte Diffusivity model (mixture)
The binary parameters kij and mij allow accurate representation of complex
liquid mixture viscosity. Both binary parameters default to zero.
Parameter Symbol Default MDS Lower Upper Units
Name/Element
Limit Limit
ANDKIJ/1 a ij 0 — — — —
ANDKIJ/2 b ij 0 — — — —
ANDMIJ/1 c ij 0 — — — —
ANDMIJ/2 d ij 0 — — — —
The pure component liquid viscosity �i *,l is calculated by the General Pure
Component Liquid Viscosity model.