APIdiffCoefThermophysicalFunction.H

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Class
    Foam::thermophysicalFunctions::APIdiffCoefFunc

Description
    API function for vapour mass diffusivity

    Source:
    \verbatim
            API (American Petroleum Institute)
                    Technical Data Book
    \endverbatim

\*---------------------------------------------------------------------------*/

#ifndef APIdiffCoefThermophysicalFunction_H
#define APIdiffCoefThermophysicalFunction_H

#include "thermophysicalFunction.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace thermophysicalFunctions
{

/*---------------------------------------------------------------------------*\
                      Class APIdiffCoef Declaration
\*---------------------------------------------------------------------------*/

class APIdiffCoef
:
    public thermophysicalFunction
{
    // Private Data

        // API vapour mass diffusivity function coefficients
        scalar a_, b_, wf_, wa_;

        // Helper variables
        scalar alpha_, beta_;


public:

    //- Runtime type information
    TypeName("APIdiffCoef");


    // Constructors

        //- Construct from components
        APIdiffCoef
        (
            const scalar a,
            const scalar b,
            const scalar wf,
            const scalar wa
        );

        //- Construct from dictionary
        APIdiffCoef(const dictionary& dict);


    // Member Functions

        //- API vapour mass diffusivity function using properties from
        //  construction
        scalar f(scalar p, scalar T) const
        {
            return 3.6059e-3*(pow(1.8*T, 1.75))*alpha_/(p*beta_);
        }

        //- API vapour mass diffusivity function using properties from
        //  construction - with specified binary pair
        scalar f(scalar p, scalar T, scalar  Wa) const
        {
            const scalar alphaBinary = sqrt(1/wf_ + 1/Wa);
            return 3.6059e-3*(pow(1.8*T, 1.75))*alphaBinary/(p*beta_);
        }

        using thermophysicalFunction::write;

        //- Write the function coefficients
        virtual void write(Ostream& os) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace thermophysicalFunctions
} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //