.Modelica.Media.IdealGases.Common.SingleGasNasa.dynamicViscosityLowPressure

Information

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

Interface

function dynamicViscosityLowPressure
  extends Modelica.Icons.Function;
  input SI.Temperature T "Gas temperature";
  input SI.Temperature Tc "Critical temperature of gas";
  input SI.MolarMass M "Molar mass of gas";
  input SI.MolarVolume Vc "Critical molar volume of gas";
  input Real w "Acentric factor of gas";
  input Modelica.Media.Interfaces.Types.DipoleMoment mu "Dipole moment of gas molecule";
  input Real k = 0.0 "Special correction for highly polar substances";
  output Modelica.Media.Interfaces.Types.DynamicViscosity eta "Dynamic viscosity of gas";
end dynamicViscosityLowPressure;