This information is part of the Modelica Standard Library maintained by the Modelica Association.

The used formula are based on the method of Chung et al (1984, 1988) referred to in ref [1] chapter 9. The formula 9-4.10 is the one being used. The formula is given in non-SI units, the following conversion constants were used to transform the formula to SI units:

• Const1_SI: The factor 10^(-9.5) =10^(-2.5)*1e-7 where the factor 10^(-2.5) originates from the conversion of g/mol->kg/mol + cm^3/mol->m^3/mol and the factor 1e-7 is due to conversion from microPoise->Pa.s.
• Const2_SI: The factor 1/3.335641e-27 = 1e-3/3.335641e-30 where the factor 3.335641e-30 comes from debye->C.m and 1e-3 is due to conversion from cm^3/mol->m^3/mol

References

[1] Bruce E. Poling, John E. Prausnitz, John P. O'Connell, "The Properties of Gases and Liquids" 5th Ed. Mc Graw Hill.

Author

T. Skoglund, Lund, Sweden, 2004-08-31

eta = dynamicViscosityLowPressure(T, Tc, M, Vc, w, mu, k)

T	Type: Temperature (K) Description: Gas temperature
Tc	Type: Temperature (K) Description: Critical temperature of gas
M	Type: MolarMass (kg/mol) Description: Molar mass of gas
Vc	Type: MolarVolume (m³/mol) Description: Critical molar volume of gas
w	Type: Real Description: Acentric factor of gas
mu	Type: DipoleMoment (debye) Description: Dipole moment of gas molecule
k	Default Value: 0.0 Type: Real Description: Special correction for highly polar substances

eta	Type: DynamicViscosity (Pa·s) Description: Dynamic viscosity of gas