/usr/include/freefoam/coalCombustion/COxidationKineticDiffusionLimitedRate.C is in libfreefoam-dev 0.1.0+dfsg-1build1.
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2008-2010 OpenCFD Ltd.
\\/ M anipulation |
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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.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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
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\*---------------------------------------------------------------------------*/
#include "COxidationKineticDiffusionLimitedRate.H"
#include <OpenFOAM/mathematicalConstants.H>
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template<class CloudType>
Foam::COxidationKineticDiffusionLimitedRate<CloudType>::
COxidationKineticDiffusionLimitedRate
(
const dictionary& dict,
CloudType& owner
)
:
SurfaceReactionModel<CloudType>
(
dict,
owner,
typeName
),
Sb_(dimensionedScalar(this->coeffDict().lookup("Sb")).value()),
C1_(dimensionedScalar(this->coeffDict().lookup("C1")).value()),
C2_(dimensionedScalar(this->coeffDict().lookup("C2")).value()),
E_(dimensionedScalar(this->coeffDict().lookup("E")).value()),
CsLocalId_(-1),
O2GlobalId_(owner.composition().globalCarrierId("O2")),
CO2GlobalId_(owner.composition().globalCarrierId("CO2")),
WC_(0.0),
WO2_(0.0),
HcCO2_(0.0)
{
// Determine Cs ids
label idSolid = owner.composition().idSolid();
CsLocalId_ = owner.composition().localId(idSolid, "C");
// Set local copies of thermo properties
WO2_ = owner.mcCarrierThermo().speciesData()[O2GlobalId_].W();
scalar WCO2 = owner.mcCarrierThermo().speciesData()[CO2GlobalId_].W();
WC_ = WCO2 - WO2_;
HcCO2_ = owner.mcCarrierThermo().speciesData()[CO2GlobalId_].Hc();
if (Sb_ < 0)
{
FatalErrorIn
(
"COxidationKineticDiffusionLimitedRate"
"("
"const dictionary&, "
"CloudType&"
")"
) << "Stoichiometry of reaction, Sb, must be greater than zero" << nl
<< exit(FatalError);
}
}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
template<class CloudType>
Foam::COxidationKineticDiffusionLimitedRate<CloudType>::
~COxidationKineticDiffusionLimitedRate()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class CloudType>
bool Foam::COxidationKineticDiffusionLimitedRate<CloudType>::active() const
{
return true;
}
template<class CloudType>
Foam::scalar Foam::COxidationKineticDiffusionLimitedRate<CloudType>::calculate
(
const scalar dt,
const label cellI,
const scalar d,
const scalar T,
const scalar Tc,
const scalar pc,
const scalar rhoc,
const scalar mass,
const scalarField& YGas,
const scalarField& YLiquid,
const scalarField& YSolid,
const scalarField& YMixture,
const scalar N,
scalarField& dMassGas,
scalarField& dMassLiquid,
scalarField& dMassSolid,
scalarField& dMassSRCarrier
) const
{
// Fraction of remaining combustible material
const label idSolid = CloudType::parcelType::SLD;
const scalar fComb = YMixture[idSolid]*YSolid[CsLocalId_];
// Surface combustion active combustible fraction is consumed
if (fComb < SMALL)
{
return 0.0;
}
// Local mass fraction of O2 in the carrier phase
const scalar YO2 = this->owner().mcCarrierThermo().Y(O2GlobalId_)[cellI];
// Diffusion rate coefficient
const scalar D0 = C1_/d*pow(0.5*(T + Tc), 0.75);
// Kinetic rate
const scalar Rk = C2_*exp(-E_/(specie::RR*Tc));
// Particle surface area
const scalar Ap = mathematicalConstant::pi*sqr(d);
// Change in C mass [kg]
scalar dmC = Ap*rhoc*specie::RR*Tc*YO2/WO2_*D0*Rk/(D0 + Rk)*dt;
// Limit mass transfer by availability of C
dmC = min(mass*fComb, dmC);
// Change in O2 mass [kg]
const scalar dmO2 = dmC/WC_*Sb_*WO2_;
// Mass of newly created CO2 [kg]
const scalar dmCO2 = dmC + dmO2;
// Update local particle C mass
dMassSolid[CsLocalId_] += dmC;
// Update carrier O2 and CO2 mass
dMassSRCarrier[O2GlobalId_] -= dmO2;
dMassSRCarrier[CO2GlobalId_] += dmCO2;
// Heat of reaction [J]
return -HcCO2_*dmCO2;
}
// ************************ vim: set sw=4 sts=4 et: ************************ //
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