WOLFRAM SYSTEM MODELER

# dynamicViscosityLowPressure

Dynamic viscosity of low pressure gases

# Wolfram Language

In[1]:=
`SystemModel["Modelica.Media.IdealGases.Common.SingleGasNasa.dynamicViscosityLowPressure"]`
Out[1]:=

# Information

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

# Syntax

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

# Inputs (7)

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

# Outputs (1)

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