BreenWestwater.C

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    Copyright (C) 2021 OpenCFD Ltd
-------------------------------------------------------------------------------
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
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#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_);
}
 
 
// ************************************************************************* //