Aspen Physical Property System - Physical Property Models

Parameter
Name/Element
256 3 Transport Property Models
Symbol Default MDS Lower
Limit
Upper
Limit
Units
MUVSUT/4 C 4i 1000 X — — TEMPERATURE
†† If C2i is non-zero, absolute temperature units are assumed for C1i and C2i.
Otherwise, all coefficients are interpreted in user input temperature units. The
temperature limits are always interpreted in user input units.
Polynomial
Parameter
Name/Element
Symbol Default MDS Lower
Limit
Upper
Limit
Units
MUVPO/1 C 1i — X — — VISCOSITY
MUVPO/2, ..., 10 C 2i, ..., C 10i 0 X — — VISCOSITY,
TEMPERATURE
MUVPO/11 C 11i 0 X — — TEMPERATURE
MUVPO/12 C 12i 1000 X — — TEMPERATURE
NIST ThermoML Polynomial
Parameter
Name/Element
Symbol Default MDS Lower
Limit
Upper
Limit
Units
MUVTMLPO/1 C 1i — X — — Pa*s/T
MUVTMLPO/2, ..., 4 C 2i , ..., C 4i 0 X — — Pa*s/T
MUVTMLPO/5 nTerms 4 X — — —
MUVTMLPO/6 T lower 0 X — — TEMPERATURE
MUVTMLPO/7 T upper 1000 X — — TEMPERATURE
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. 392.
Chapman-Enskog-Brokaw-Wilke Mixing
Rule
The low pressure vapor mixture viscosity is calculated by the Wilke
approximation of the Chapman-Enskog equation:
For �ij,the formulation by Brokaw is used: