FullerDiffusionCoefficient.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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Class
    Foam::Function2s::FullerDiffusionCoefficient
 
Description
    Fuller et al. correlation for vapour mass diffusivity.
 
    \verbatim
        E. N. Fuller, E. N., Schettler P. D.,  Giddings, J. C. (1966).
        A New Method For Prediction Of Binary Gas-Phase Diffusion Coefficients
        Ind. Eng. Chem. 58(5), 19.
    \endverbatim
 
\*---------------------------------------------------------------------------*/
 
#ifndef FullerDiffusionCoefficient_H
#define FullerDiffusionCoefficient_H
 
#include "Function2.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function2s
{
 
/*---------------------------------------------------------------------------*\
                         Class FullerDiffusionCoefficient Declaration
\*---------------------------------------------------------------------------*/
 
class FullerDiffusionCoefficient
:
    public FieldFunction2<scalar, FullerDiffusionCoefficient>
{
    // Private Data
 
        // Vapour mass diffusivity function coefficients
        scalar Va_, Vb_, Ma_, Mb_;
 
        // Helper variables
        scalar alpha_, beta_;
 
 
public:
 
    //- Runtime type information
    TypeName("FullerDiffusionCoefficient");
 
 
    // Constructors
 
        //- Construct from name and dictionary
        FullerDiffusionCoefficient
        (
            const word& name,
            const unitSets& units,
            const dictionary& dict
        );
 
        //- Construct and return a clone
        virtual tmp<Function2<scalar>> clone() const
        {
            return tmp<Function2<scalar>>
            (
                new FullerDiffusionCoefficient(*this)
            );
        }
 
 
    // Member Functions
 
        //- Inherit base class value methods to prevent clang warnings
        using FieldFunction2<scalar, FullerDiffusionCoefficient>::value;
 
        //- Vapour mass diffusivity function
        virtual scalar value(scalar p, scalar T) const
        {
            return 101325e-7*(pow(T, 1.75))*alpha_/(p*beta_);
        }
 
        //- Write the function coefficients
        virtual void write(Ostream& os, const unitSets& units) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function2s
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //