functiondynamicViscosityLowPressure
Dynamic viscosity of low pressure gases
Extends from Modelica.Icons.Function.
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
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Temperature | T | Gas temperature | |
| SI.Temperature | Tc | Critical temperature of gas | |
| SI.MolarMass | M | Molar mass of gas | |
| SI.MolarVolume | Vc | Critical molar volume of gas | |
| Real | w | Acentric factor of gas | |
| ThermofluidStream.Media.myMedia.Interfaces.Types.DipoleMoment | mu | Dipole moment of gas molecule | |
| Real | k | 0.0 | Special correction for highly polar substances |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| ThermofluidStream.Media.myMedia.Interfaces.Types.DynamicViscosity | eta | Dynamic viscosity of gas |