This model calculates the medium properties for single component ideal gases.
Sources for model and literature:
Original Data: Computer program for calculation of complex chemical
equilibrium compositions and applications. Part 1: Analysis
Document ID: 19950013764 N (95N20180) File Series: NASA Technical Reports
Report Number: NASA-RP-1311 E-8017 NAS 1.61:1311
Authors: Gordon, Sanford (NASA Lewis Research Center)
Mcbride, Bonnie J. (NASA Lewis Research Center)
Published: Oct 01, 1994.
Known limits of validity:
The data is valid for
temperatures between 200 K and 6000 K. A few of the data sets for
monatomic gases have a discontinuous 1st derivative at 1000 K, but
this never caused problems so far.
This model has been copied from the ThermoFluid library. It has been developed by Hubertus Tummescheit.
| Name | Description |
|---|---|
| ThermodynamicState | Thermodynamic state variables |
| BaseProperties | Base properties (p, d, T, h, u, R_s, MM, X, and Xi of NASA mixture gas |
| setState_pTX | Return thermodynamic state as function of p, T and composition X |
| setState_phX | Return thermodynamic state as function of p, h and composition X |
| setState_psX | Return thermodynamic state as function of p, s and composition X |
| setState_dTX | Return thermodynamic state as function of d, T and composition X |
| setSmoothState | Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b |
| pressure | Return pressure of ideal gas |
| temperature | Return temperature of ideal gas |
| density | Return density of ideal gas |
| specificEnthalpy | Return specific enthalpy |
| specificInternalEnergy | Return specific internal energy |
| specificEntropy | Return specific entropy |
| specificGibbsEnergy | Return specific Gibbs energy |
| specificHelmholtzEnergy | Return specific Helmholtz energy |
| h_TX | Return specific enthalpy |
| h_TX_der | Return specific enthalpy derivative |
| gasConstant | Return gasConstant |
| specificHeatCapacityCp | Return specific heat capacity at constant pressure |
| specificHeatCapacityCv | Return specific heat capacity at constant volume from temperature and gas data |
| MixEntropy | Return mixing entropy of ideal gases / R |
| s_TX | Return temperature dependent part of the entropy, expects full entropy vector |
| isentropicExponent | Return isentropic exponent |
| velocityOfSound | Return velocity of sound |
| isentropicEnthalpyApproximation | Approximate method of calculating h_is from upstream properties and downstream pressure |
| isentropicEnthalpy | Return isentropic enthalpy |
| gasMixtureViscosity | Return viscosities of gas mixtures at low pressures (Wilke method) |
| dynamicViscosity | Return mixture dynamic viscosity |
| mixtureViscosityChung | Return the viscosity of gas mixtures without access to component viscosities (Chung, et. al. rules) |
| lowPressureThermalConductivity | Return thermal conductivities of low-pressure gas mixtures (Mason and Saxena Modification) |
| thermalConductivity | Return thermal conductivity for low pressure gas mixtures |
| isobaricExpansionCoefficient | Return isobaric expansion coefficient beta |
| isothermalCompressibility | Return isothermal compressibility factor |
| density_derp_T | Return density derivative by pressure at constant temperature |
| density_derT_p | Return density derivative by temperature at constant pressure |
| density_derX | Return density derivative by mass fraction |
| molarMass | Return molar mass of mixture |
| T_hX | Return temperature from specific enthalpy and mass fraction |
| T_psX | Return temperature from pressure, specific entropy and mass fraction |