This is the base package for medium models of incompressible fluids based on tables. The minimal data to provide for a useful medium description is tables of density and heat capacity as functions of temperature.
It should be noted that incompressible media only have 1 state per control volume (usually T), but have both T and p as inputs for fully correct properties. The error of using only T-dependent properties is small, therefore a Boolean flag enthalpyOfT exists. If it is true, the enumeration Choices.IndependentVariables is set to Choices.IndependentVariables.T otherwise it is set to Choices.IndependentVariables.pT.
To implement a new medium model, create a package that extends TableBased and provides one or more of the constant tables:
tableDensity = [T, d]; tableHeatCapacity = [T, Cp]; tableConductivity = [T, lam]; tableViscosity = [T, eta]; tableVaporPressure = [T, pVap];
The table data is used to fit constant polynomials of order npol, the temperature data points do not need to be same for different properties. Properties like enthalpy, inner energy and entropy are calculated consistently from integrals and derivatives of d(T) and Cp(T). The minimal data for a useful medium model is thus density and heat capacity. Transport properties and vapor pressure are optional, if the data tables are empty the corresponding function calls can not be used.
| Name | Description |
|---|---|
| invertTemp | Function to invert temperatures |
| BaseProperties | Base properties of T dependent medium |
| setState_pTX | Returns state record, given pressure and temperature |
| setState_dTX | Returns state record, given pressure and temperature |
| setState_pT | Returns state record as function of p and T |
| setState_phX | Returns state record, given pressure and specific enthalpy |
| setState_ph | Returns state record as function of p and h |
| setState_psX | Returns state record, given pressure and specific entropy |
| setState_ps | Returns state record as function of p and s |
| setSmoothState | Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b |
| specificHeatCapacityCv | Specific heat capacity at constant volume (or pressure) of medium |
| specificHeatCapacityCp | Specific heat capacity at constant volume (or pressure) of medium |
| dynamicViscosity | Return dynamic viscosity as a function of the thermodynamic state record |
| thermalConductivity | Return thermal conductivity as a function of the thermodynamic state record |
| s_T | Compute specific entropy |
| specificEntropy | Return specific entropy as a function of the thermodynamic state record |
| h_T | Compute specific enthalpy from temperature |
| h_T_der | Compute specific enthalpy from temperature |
| h_pT | Compute specific enthalpy from pressure and temperature |
| density_T | Return density as function of temperature |
| temperature | Return temperature as a function of the thermodynamic state record |
| pressure | Return pressure as a function of the thermodynamic state record |
| density | Return density as a function of the thermodynamic state record |
| specificEnthalpy | Return specific enthalpy as a function of the thermodynamic state record |
| specificInternalEnergy | Return specific internal energy as a function of the thermodynamic state record |
| T_ph | Compute temperature from pressure and specific enthalpy |
| T_ps | Compute temperature from pressure and specific enthalpy |