APIdiffCoefFunc.H

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License
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Class
    Foam::APIdiffCoefFunc
 
Description
    API function for vapour mass diffusivity
 
    Source:
    \verbatim
            API (American Petroleum Institute)
                    Technical Data Book
    \endverbatim
 
\*---------------------------------------------------------------------------*/
 
#ifndef APIdiffCoefFunc_H
#define APIdiffCoefFunc_H
 
#include "thermophysicalFunction.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class APIdiffCoefFunc Declaration
\*---------------------------------------------------------------------------*/
 
class APIdiffCoefFunc
:
    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("APIdiffCoefFunc");
 
 
    // Constructors
 
        //- Construct from components
        APIdiffCoefFunc
        (
            const scalar a,
            const scalar b,
            const scalar wf,
            const scalar wa
        );
 
        //- Construct from Istream
        APIdiffCoefFunc(Istream& is);
 
        //- Construct from dictionary
        APIdiffCoefFunc(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_);
        }
 
        //- Write the function coefficients
        void writeData(Ostream& os) const
        {
            os  << a_ << token::SPACE
                << b_ << token::SPACE
                << wf_ << token::SPACE
                << wa_;
        }
 
 
    // Ostream Operator
 
        friend Ostream& operator<<(Ostream& os, const APIdiffCoefFunc& f)
        {
            f.writeData(os);
            return os;
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //