PengRobinsonGas.H

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Class
    Foam::PengRobinsonGas
 
Description
    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
    \table
        Property     | Description
        Tc           | Critical temperature [K]
        Vc           | Critical volume [m^3/kmol]
        Pc           | Critical pressure [Pa]
        omega        | Acentric factor [-]
    \endtable
 
    Example specification of the PengRobinsonGas equation of state for methane:
    \verbatim
    equationOfState
    {
        Tc        190.55;
        Vc        0.0285;
        Pc        4.595e6;
        omega     0.0115;
 
    }
    \endverbatim
 
SourceFiles
    PengRobinsonGasI.H
    PengRobinsonGas.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef PengRobinsonGas_H
#define PengRobinsonGas_H
 
#include "autoPtr.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of friend functions and operators
 
template<class Specie> class PengRobinsonGas;
 
template<class Specie>
inline PengRobinsonGas<Specie> operator+
(
    const PengRobinsonGas<Specie>&,
    const PengRobinsonGas<Specie>&
);
 
template<class Specie>
inline PengRobinsonGas<Specie> operator*
(
    const scalar,
    const PengRobinsonGas<Specie>&
);
 
template<class Specie>
inline PengRobinsonGas<Specie> operator==
(
    const PengRobinsonGas<Specie>&,
    const PengRobinsonGas<Specie>&
);
 
template<class Specie>
Ostream& operator<<
(
    Ostream&,
    const PengRobinsonGas<Specie>&
);
 
 
 
/*---------------------------------------------------------------------------*\
                       Class PengRobinsonGas Declaration
\*---------------------------------------------------------------------------*/
 
template<class Specie>
class PengRobinsonGas
:
    public Specie
{
    // Private Data
 
        //- Critical Temperature [K]
        scalar Tc_;
 
        //- Critical volume [m^3/kmol]
        scalar Vc_;
 
        //- Critical compression factor [-]
        scalar Zc_;
 
        //- Critical Pressure [Pa]
        scalar Pc_;
 
        //- Acentric factor [-]
        scalar omega_;
 
 
public:
 
    // Constructors
 
        //- Construct from components
        inline PengRobinsonGas
        (
            const Specie& sp,
            const scalar& Tc,
            const scalar& Vc,
            const scalar& Zc,
            const scalar& Pc,
            const scalar& omega
        );
 
        //- Construct from name and dictionary
        PengRobinsonGas(const word& name, const dictionary& dict);
 
        //- Construct as named copy
        inline PengRobinsonGas(const word& name, const PengRobinsonGas&);
 
        //- Construct and return a clone
        inline autoPtr<PengRobinsonGas> clone() const;
 
 
    // Member Functions
 
        //- Return the instantiated type name
        static word typeName()
        {
            return "PengRobinsonGas<" + word(Specie::typeName_()) + '>';
        }
 
        // Fundamental properties
 
 
            //- Is the equation of state is incompressible i.e. rho != f(p)
            static const bool incompressible = false;
 
            //- Is the equation of state is isochoric i.e. rho = const
            static const bool isochoric = false;
 
            //- Return density [kg/m^3]
            inline scalar rho(scalar p, scalar T) const;
 
            //- Return enthalpy contribution [J/kg]
            inline scalar h(const scalar p, const scalar T) const;
 
            //- Return Cp contribution [J/(kg K]
            inline scalar Cp(scalar p, scalar T) const;
 
            //- Return internal energy contribution [J/kg]
            inline scalar e(const scalar p, const scalar T) const;
 
            //- Return Cv contribution [J/(kg K]
            inline scalar Cv(scalar p, scalar T) const;
 
            //- Return entropy contribution to the integral of Cp/T [J/kg/K]
            inline scalar sp(const scalar p, const scalar T) const;
 
            //- Return entropy contribution to the integral of Cv/T [J/kg/K]
            inline scalar sv(const scalar p, const scalar T) const;
 
            //- Return compressibility [s^2/m^2]
            inline scalar psi(scalar p, scalar T) const;
 
            //- Return compression factor []
            inline scalar Z(scalar p, scalar T) const;
 
            //- Return (Cp - Cv) [J/(kg K]
            inline scalar CpMCv(scalar p, scalar T) const;
 
            //- Return volumetric coefficient of thermal expansion [1/T]
            inline scalar alphav(const scalar p, const scalar T) const;
 
 
    // IO
 
            //- Write to Ostream
            void write(Ostream& os) const;
 
    // Member Operators
 
        inline void operator+=(const PengRobinsonGas&);
        inline void operator*=(const scalar);
 
 
    // Friend operators
 
        friend PengRobinsonGas operator+ <Specie>
        (
            const PengRobinsonGas&,
            const PengRobinsonGas&
        );
 
        friend PengRobinsonGas operator* <Specie>
        (
            const scalar s,
            const PengRobinsonGas&
        );
 
        friend PengRobinsonGas operator== <Specie>
        (
            const PengRobinsonGas&,
            const PengRobinsonGas&
        );
 
 
    // Ostream Operator
 
        friend Ostream& operator<< <Specie>
        (
            Ostream&,
            const PengRobinsonGas&
        );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "PengRobinsonGasI.H"
 
#ifdef NoRepository
    #include "PengRobinsonGas.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //