The OpenFOAM Foundation
PengRobinsonGas< Specie > Class Template Reference

PengRobinsonGas cubic equation of state for gases. More...

Inheritance diagram for PengRobinsonGas< Specie >:
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## Public Member Functions

PengRobinsonGas (const Specie &sp, const scalar &Tc, const scalar &Vc, const scalar &Zc, const scalar &Pc, const scalar &omega)
Construct from components. More...

PengRobinsonGas (const word &name, const dictionary &dict)
Construct from name and dictionary. More...

PengRobinsonGas (const word &name, const PengRobinsonGas &)
Construct as named copy. More...

autoPtr< PengRobinsonGasclone () const
Construct and return a clone. More...

scalar rho (scalar p, scalar T) const
Return density [kg/m^3]. More...

scalar H (const scalar p, const scalar T) const
Return enthalpy contribution [J/kg]. More...

scalar Cp (scalar p, scalar T) const
Return Cp contribution [J/(kg K]. More...

scalar E (const scalar p, const scalar T) const
Return internal energy contribution [J/kg]. More...

scalar Cv (scalar p, scalar T) const
Return Cv contribution [J/(kg K]. More...

scalar Sp (const scalar p, const scalar T) const
Return entropy contribution to the integral of Cp/T [J/kg/K]. More...

scalar Sv (const scalar p, const scalar T) const
Return entropy contribution to the integral of Cv/T [J/kg/K]. More...

scalar psi (scalar p, scalar T) const
Return compressibility [s^2/m^2]. More...

scalar Z (scalar p, scalar T) const
Return compression factor []. More...

scalar CpMCv (scalar p, scalar T) const
Return (Cp - Cv) [J/(kg K]. More...

scalar alphav (const scalar p, const scalar T) const
Return volumetric coefficient of thermal expansion [1/T]. More...

void write (Ostream &os) const
Write to Ostream. More...

void operator+= (const PengRobinsonGas &)

void operator*= (const scalar)

## Static Public Member Functions

static word typeName ()
Return the instantiated type name. More...

## Static Public Attributes

static const bool incompressible = false
Is the equation of state is incompressible i.e. rho != f(p) More...

static const bool isochoric = false
Is the equation of state is isochoric i.e. rho = const. More...

## Friends

PengRobinsonGas operator+ (const PengRobinsonGas &, const PengRobinsonGas &)

PengRobinsonGas operator* (const scalar s, const PengRobinsonGas &)

PengRobinsonGas operator== (const PengRobinsonGas &, const PengRobinsonGas &)

Ostreamoperator (Ostream &, const PengRobinsonGas &)

## Detailed Description

### template<class Specie> class Foam::PengRobinsonGas< Specie >

PengRobinsonGas cubic equation of state for gases.

Coefficient mixing is very inaccurate and not supported, so this equation of state can only be applied to mixtures by using a thermophysical properties model which mixes specie property value.

Usage
Property Description
`Tc` Critical temperature [K]
`Vc` Critical volume [m^3/kmol]
`Pc` Critical pressure [Pa]
`omega` Acentric factor [-]

Example specification of the PengRobinsonGas equation of state for methane:

```    equationOfState
{
Tc        190.55;
Vc        0.0285;
Pc        4.595e6;
omega     0.0115;

}```
Source files

Definition at line 124 of file PengRobinsonGas.H.

## ◆ PengRobinsonGas() [1/3]

 PengRobinsonGas ( const Specie & sp, const scalar & Tc, const scalar & Vc, const scalar & Zc, const scalar & Pc, const scalar & omega )
inline

Construct from components.

Definition at line 32 of file PengRobinsonGasI.H.

## ◆ PengRobinsonGas() [2/3]

 PengRobinsonGas ( const word & name, const dictionary & dict )

Construct from name and dictionary.

Definition at line 32 of file PengRobinsonGas.C.

References Foam::constant::physicoChemical::RR.

## ◆ PengRobinsonGas() [3/3]

 PengRobinsonGas ( const word & name, const PengRobinsonGas< Specie > & pg )
inline

Construct as named copy.

Definition at line 52 of file PengRobinsonGasI.H.

## ◆ clone()

 Foam::autoPtr< Foam::PengRobinsonGas< Specie > > clone
inline

Construct and return a clone.

Definition at line 69 of file PengRobinsonGasI.H.

## ◆ typeName()

 static word typeName ( )
inlinestatic

Return the instantiated type name.

Definition at line 174 of file PengRobinsonGas.H.

## ◆ rho()

 Foam::scalar rho ( scalar p, scalar T ) const
inline

Return density [kg/m^3].

Definition at line 81 of file PengRobinsonGasI.H.

References p, Foam::R(), and Foam::T().

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## ◆ H()

 Foam::scalar H ( const scalar p, const scalar T ) const
inline

Return enthalpy contribution [J/kg].

Definition at line 93 of file PengRobinsonGasI.H.

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## ◆ Cp()

 Foam::scalar Cp ( scalar p, scalar T ) const
inline

Return Cp contribution [J/(kg K].

Definition at line 115 of file PengRobinsonGasI.H.

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## ◆ E()

 Foam::scalar E ( const scalar p, const scalar T ) const
inline

Return internal energy contribution [J/kg].

Definition at line 146 of file PengRobinsonGasI.H.

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## ◆ Cv()

 Foam::scalar Cv ( scalar p, scalar T ) const
inline

Return Cv contribution [J/(kg K].

Definition at line 167 of file PengRobinsonGasI.H.

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## ◆ Sp()

 Foam::scalar Sp ( const scalar p, const scalar T ) const
inline

Return entropy contribution to the integral of Cp/T [J/kg/K].

Definition at line 190 of file PengRobinsonGasI.H.

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## ◆ Sv()

 Foam::scalar Sv ( const scalar p, const scalar T ) const
inline

Return entropy contribution to the integral of Cv/T [J/kg/K].

Definition at line 217 of file PengRobinsonGasI.H.

References NotImplemented.

## ◆ psi()

 Foam::scalar psi ( scalar p, scalar T ) const
inline

Return compressibility [s^2/m^2].

Definition at line 229 of file PengRobinsonGasI.H.

References p, Foam::R(), and Foam::T().

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## ◆ Z()

 Foam::scalar Z ( scalar p, scalar T ) const
inline

Return compression factor [].

Definition at line 242 of file PengRobinsonGasI.H.

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## ◆ CpMCv()

 Foam::scalar CpMCv ( scalar p, scalar T ) const
inline

Return (Cp - Cv) [J/(kg K].

Definition at line 304 of file PengRobinsonGasI.H.

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## ◆ alphav()

 Foam::scalar alphav ( const scalar p, const scalar T ) const
inline

Return volumetric coefficient of thermal expansion [1/T].

Definition at line 330 of file PengRobinsonGasI.H.

References NotImplemented.

## ◆ write()

 void write ( Ostream & os ) const

Write to Ostream.

Definition at line 53 of file PengRobinsonGas.C.

References Foam::vtkWriteOps::write().

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## ◆ operator+=()

 void operator+= ( const PengRobinsonGas< Specie > & )
inline

Definition at line 344 of file PengRobinsonGasI.H.

References Foam::mag(), Foam::constant::physicoChemical::RR, Foam::W(), and Y.

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## ◆ operator*=()

 void operator*= ( const scalar s )
inline

Definition at line 367 of file PengRobinsonGasI.H.

References s().

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## ◆ operator+

 PengRobinsonGas operator+ ( const PengRobinsonGas< Specie > & , const PengRobinsonGas< Specie > & )
friend

## ◆ operator*

 PengRobinsonGas operator* ( const scalar s, const PengRobinsonGas< Specie > & )
friend

## ◆ operator==

 PengRobinsonGas operator== ( const PengRobinsonGas< Specie > & , const PengRobinsonGas< Specie > & )
friend

## ◆ operator

 Ostream& operator ( Ostream & , const PengRobinsonGas< Specie > & )
friend

## ◆ incompressible

 const bool incompressible = false
static

Is the equation of state is incompressible i.e. rho != f(p)

Definition at line 183 of file PengRobinsonGas.H.

## ◆ isochoric

 const bool isochoric = false
static

Is the equation of state is isochoric i.e. rho = const.

Definition at line 186 of file PengRobinsonGas.H.

The documentation for this class was generated from the following files: