APIdiffCoef.H

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License
    This file is part of OpenFOAM.
 
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Class
    Foam::Function2s::APIdiffCoefFunc
 
Description
    API function for vapour mass diffusivity
 
    Source:
    \verbatim
            API (American Petroleum Institute)
                    Technical Data Book
    \endverbatim
 
\*---------------------------------------------------------------------------*/
 
#ifndef APIdiffCoef_H
#define APIdiffCoef_H
 
#include "Function2.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function2s
{
 
/*---------------------------------------------------------------------------*\
                         Class APIdiffCoef Declaration
\*---------------------------------------------------------------------------*/
 
class APIdiffCoef
:
    public FieldFunction2<scalar, APIdiffCoef>
{
    // 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 word& name,
            const scalar a,
            const scalar b,
            const scalar wf,
            const scalar wa
        );
 
        //- Construct from name and dictionary
        APIdiffCoef
        (
            const word& name,
            const unitConversions& units,
            const dictionary& dict
        );
 
        //- Construct and return a clone
        virtual tmp<Function2<scalar>> clone() const
        {
            return tmp<Function2<scalar>>(new APIdiffCoef(*this));
        }
 
 
    // Member Functions
 
        //- Inherit base class value methods to prevent clang warnings
        using FieldFunction2<scalar, APIdiffCoef>::value;
 
        //- API vapour mass diffusivity function using properties from
        //  construction
        virtual scalar value(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 value(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
        virtual void write(Ostream& os, const unitConversions& units) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function2s
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //