BreenWestwater.C

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    Copyright (C) 2021 OpenCFD Ltd
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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#include "BreenWestwater.H"
#include "addToRunTimeSelectionTable.H"
#include "uniformDimensionedFields.H"
#include "phasePairKey.H"
#include "phaseSystem.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace wallBoilingModels
{
namespace filmBoilingModels
{
    defineTypeNameAndDebug(BreenWestwater, 0);
    addToRunTimeSelectionTable
    (
        filmBoilingModel,
        BreenWestwater,
        dictionary
    );
}
}
}

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::wallBoilingModels::filmBoilingModels::BreenWestwater::BreenWestwater
(
    const dictionary& dict
)
:
    filmBoilingModel(),
    Cn_(dict.getOrDefault<scalar>("Cn", 0.37))
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::tmp<Foam::scalarField>
Foam::wallBoilingModels::filmBoilingModels::BreenWestwater::htcFilmBoil
(
    const phaseModel& liquid,
    const phaseModel& vapor,
    const label patchi,
    const scalarField& Tl,
    const scalarField& Tsatw,
    const scalarField& L
) const
{
    const fvPatchScalarField& Tw =
        liquid.thermo().T().boundaryField()[patchi];

    const auto& g =
        liquid.mesh().time().lookupObject<uniformDimensionedVectorField>("g");

    const labelUList& cells = liquid.mesh().boundary()[patchi].faceCells();
    const scalarField& pw = liquid.thermo().p().boundaryField()[patchi];

    tmp<scalarField> trhoVapor = vapor.thermo().rhoEoS(pw, Tsatw, cells);
    const scalarField& rhoVapor = trhoVapor.ref();

    tmp<scalarField> trhoLiq = liquid.thermo().rhoEoS(pw, Tsatw, cells);
    const scalarField& rhoLiq = trhoLiq.ref();


    const scalarField kappaLiquid(liquid.kappa(patchi));

    tmp<scalarField> tCp = vapor.thermo().Cp(pw, Tsatw, cells);
    const scalarField& CpVapor = tCp();

    const scalarField nuLiquid(liquid.nu(patchi));

    const scalarField Leff
    (
        L*sqr(1 + 0.34*CpVapor*max((Tw-Tsatw), scalar(0))/L)
    );

    const scalarField rhoDiff(rhoLiq - rhoVapor);

    const phasePairKey pair(liquid.name(), vapor.name());
    const scalarField sigma
    (
        liquid.fluid().sigma(pair)().boundaryField()[patchi]
    );

    return
         Cn_
        /pow(sigma/mag(g.value())/rhoDiff, 1/8)
        /pow
         (
             nuLiquid*max((Tw-Tsatw), scalar(1e-3))
            /(pow3(kappaLiquid)*rhoVapor*Leff*mag(g.value())*rhoDiff)
            , 0.25
         );
}


void Foam::wallBoilingModels::filmBoilingModels::BreenWestwater::write
(
    Ostream& os
) const
{
    filmBoilingModel::write(os);
    os.writeEntry("Cn", Cn_);
}


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