WOLFRAM SYSTEMMODELER

DryAirNasa

Air: Detailed dry air model as ideal gas (200..6000 K)

Package Contents

dynamicViscosity

Return dynamic viscosity of dry air (simple polynomial, moisture influence small, valid from 123.15 K to 1273.15 K, outside of this range linear extrapolation is used)

thermalConductivity

Return thermal conductivity of dry air (simple polynomial, moisture influence small, valid from 123.15 K to 1273.15 K, outside of this range linear extrapolation is used)

Package Constants (22)

ThermoStates

Value: Modelica.Media.Interfaces.Choices.IndependentVariables.pT

Type: IndependentVariables

Description: Enumeration type for independent variables

mediumName

Value: "Air"

Type: String

Description: Name of the medium

substanceNames

Value: {data.name}

Type: String[:]

Description: Names of the mixture substances. Set substanceNames={mediumName} if only one substance.

extraPropertiesNames

Value: fill("", 0)

Type: String[:]

Description: Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused

singleState

Value: false

Type: Boolean

Description: = true, if u and d are not a function of pressure

reducedX

Value: true

Type: Boolean

Description: = true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)

fixedX

Value: true

Type: Boolean

Description: = true if medium contains the equation X = reference_X

reference_p

Value: 101325

Type: AbsolutePressure (Pa)

Description: Reference pressure of Medium: default 1 atmosphere

reference_T

Value: 298.15

Type: Temperature (K)

Description: Reference temperature of Medium: default 25 deg Celsius

reference_X

Value: fill(1 / nX, nX)

Type: MassFraction[nX] (kg/kg)

Description: Default mass fractions of medium

p_default

Value: 101325

Type: AbsolutePressure (Pa)

Description: Default value for pressure of medium (for initialization)

T_default

Value: Modelica.SIunits.Conversions.from_degC(20)

Type: Temperature (K)

Description: Default value for temperature of medium (for initialization)

h_default

Value: specificEnthalpy_pTX(p_default, T_default, X_default)

Type: SpecificEnthalpy (J/kg)

Description: Default value for specific enthalpy of medium (for initialization)

X_default

Value: reference_X

Type: MassFraction[nX] (kg/kg)

Description: Default value for mass fractions of medium (for initialization)

C_default

Value: fill(0, nC)

Type: ExtraProperty[nC]

Description: Default value for trace substances of medium (for initialization)

nS

Value: size(substanceNames, 1)

Type: Integer

Description: Number of substances

nX

Value: nS

Type: Integer

Description: Number of mass fractions

nXi

Value: if fixedX then 0 else if reducedX then nS - 1 else nS

Type: Integer

Description: Number of structurally independent mass fractions (see docu for details)

nC

Value: size(extraPropertiesNames, 1)

Type: Integer

Description: Number of extra (outside of standard mass-balance) transported properties

C_nominal

Value: 1.0e-6 * ones(nC)

Type: Real[nC]

Description: Default for the nominal values for the extra properties

data

Value: IdealGases.Common.SingleGasesData.Air

Type: DataRecord

Description: Data record of ideal gas substance

fluidConstants

Value: {IdealGases.Common.FluidData.N2}

Type: FluidConstants[nS]

Description: Constant data for the fluid

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Ideal gas medium model for dry air based on the package IdealGases with additional functions for dynamic viscosity and thermal conductivity in a limited temperature range.

Wolfram Language

In[1]:=
SystemModel["Modelica.Media.Air.DryAirNasa"]
Out[1]:=

Extended by (1)

Medium

Modelica.Media.Examples.SolveOneNonlinearEquation.Inverse_sh_T

Medium model