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-------------------------------------------------------------------------------
License
    This file is part of the Multiphase Code Repository by HZDR.

    Copyright (C) 2025 by Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR),
    Website: https://hzdr.de

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Class
    Foam::heatTransferModels::Gunn

Description
    Gunn (1978) correlation for fixed and fluidised beds with Re < 10^5
    and continuous phase fraction between 0.35 and 1.

    Reference:
    \verbatim
        Gunn, D. J. (1978).
        Transfer of heat or mass to particles in fixed and fluidised beds.
        International Journal of Heat and Mass Transfer, 21(4), 467-476.
    \endverbatim

SourceFiles
    Gunn.C

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

#ifndef Gunn_H
#define Gunn_H

#include "heatTransferModel.H"

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

namespace Foam
{
namespace heatTransferModels
{

/*---------------------------------------------------------------------------*\
                            Class Gunn Declaration
\*---------------------------------------------------------------------------*/

class Gunn
:
    public heatTransferModel
{
    // Private Data

        //- Interface
        const dispersedPhaseInterface interface_;


public:

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


    // Constructors

        //- Construct from a dictionary and an interface
        Gunn
        (
            const dictionary& dict,
            const phaseInterface& interface,
            const bool registerObject
        );


    //- Destructor
    virtual ~Gunn();


    // Member Functions

        //- The heat transfer function K used in the enthalpy equation
        tmp<volScalarField> K(const scalar residualAlpha) const;
};


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

} // End namespace heatTransferModels
} // End namespace Foam

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

#endif

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