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Evaporation model in diesel Spray

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Old   March 20, 2014, 04:48
Post Evaporation model in diesel Spray
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bilal
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I am working on the Fuel Injection Spray Model of Diesel Engine and I have some problem related to Evaporation of Urea and Water. I am using Open Foam 2.1.

I am using "LiquidEvaporation Model" for Water and for Urea i am using "SingleKineticRateDevolatilisation Model".

And other properties are
"
constantProperties
{
parcelTypeId 1;

rhoMin 1e-15;
TMin 200;
pMin 1000;
minParticleMass 1e-15;

rho0 1087;
T0 333.15;
Cp0 3395;

youngsModulus 1e9;
poissonsRatio 0.35;

epsilon0 1;
f0 0.5;

Tvap 406;
Tbp 465;
Pr 0.7;
LDevol 3086523;
hRetentionCoeff 0;

constantVolume false;
}


subModels
{
particleForces
{
sphereDrag;

}

injectionModel coneInjection; // patchInjection

dispersionModel stochasticDispersionRAS;

patchInteractionModel localInteraction; // localInteraction | standardWallInteraction

heatTransferModel RanzMarshall;

compositionModel singleMixtureFraction;//singlePhaseMixture;//singleMixtureFraction;

phaseChangeModel liquidEvaporation;

devolatilisationModel singleKineticRateDevolatilisation;

surfaceReactionModel none;

surfaceFilmModel none;

radiation off;

coneInjectionCoeffs
{
duration 1; // steadyState
positionAxis

"

So can you help and tell me what constant value is not correct or which parameters in this Spray Model i can change so that i get the Complete or Maximum Evaporation of Urea and Water.

your reply should be really Appreciated.
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Old   March 20, 2014, 11:58
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Marco A. Turcios
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Which lagrangian solver are you using? If you could post a link to your sprayProperties (or similar) file you are using we could get a better look. It would be good to see the way the devolatilization model is set up.
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Old   March 21, 2014, 04:37
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bilal
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Hi! Marco,

Thanks for your reply and interest. I am Using "SimpleReactingParcelFoam" as lagrangian solver.

And Properties are like that

//massFlowRate 0.001;
massFlowRate 6.41e-6;

parcelsPerInjector 300;
parcelBasisType mass;
flowRateProfile constant 1.0;
Umag constant 32.0;

thetaInner constant 0;
thetaOuter constant 9;

sizeDistribution (Example*)
{

(
minValue 100e-06;
maxValue 100e-06;

)
}


RanzMarshallCoeffs
{
BirdCorrection true;
}

singleMixtureFractionCoeffs
{
phases
(
gas
{
CH4N2O 1;
}
liquid
{
//CH4N2O 0.32;
H2O 1;
}
solid
{
}
);
YGasTot0 0.32;
YLiquidTot0 0.68;
YSolidTot0 0;
}
singlePhaseMixtureCoeffs
{
phases
(
liquid
{
CH4N2O 0.32;
H2O 0.68;
}
);
}
liquidEvaporationCoeffs
{
enthalpyTransfer enthalpyDifference;
activeLiquids ( H2O );
}



singleKineticRateDevolatilisationCoeffs
{



volatileData (Example*)
(

(CH4N2O 1.467e35)

);

liquid
{ CH4N2O;
}
residualCoeff 1e16;


}


}

so this is the example how i use and setup the properties ....so what you think ?? what is the problem that temperature drop is not steady and not physical applicable where i have to do some changes and which factor is more important i can work or focus on or is there any other model i can choose instead of this??

Last edited by brbbhatti; March 23, 2014 at 15:14.
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dieselspray, evaporation model, spray evaporation, spray model

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