Aspen Physical Property System - Physical Property Models

Parameter
Name/Element
3 Transport Property Models 279
Symbol Default MDS Lower
Limit
Upper
Limit
Units
KVTMLPO/1 C 1i — x — — THERMAL-
CONDUCTIVITY,
TEMPERATURE
KVTMLPO/2, ... ,
4
C 2i, ..., C 4i 0 x — — THERMAL-
CONDUCTIVITY,
TEMPERATURE
KVTMLPO/5 nTerms 4 x — — —
KVTMLPO/6 T lower 0 x — — TEMPERATURE
KVTMLPO/7 T upper 1000 x — — TEMPERATURE
References
R.C. Reid, J.M. Praunitz, and B.E. Poling, The Properties of Gases and Liquid,
4th ed., (New York: McGraw-Hill, 1987), p. 494.
Stiel-Thodos Pressure Correction Model
The pressure correction to a pure component or mixture thermal conductivity
at low pressure is given by:
Where:
�rm
=
The parameter Vm v can be obtained from Redlich-Kwong.
� v (p = 0) can be obtained from the low pressure General Pure Component
Vapor Thermal Conductivity.
This model should not be used for polar substances, hydrogen, or helium.
Parameter Symbol Default MDS Lower Upper Units
Name/Element
Limit Limit
MW M i — — 1.0 5000.0 —
TC T ci — — 5.0 2000.0 TEMPERATURE
PC — — — 10 5
10 8
PRESSURE
VC V ci — — 0.001 3.5 MOLE-VOLUME
ZC Z ci — — 0.1 0.5 —
References
R.C. Reid, J.M. Praunitz, and B.E. Poling, The Properties of Gases and Liquids,
4th ed., (New York: McGraw-Hill, 1987), p. 521.
Vredeveld Mixing Rule
Liquid mixture thermal conductivity is calculated using the Vredeveld equation
(Reid et al., 1977):