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March 20, 2014, 05:48 |
Evaporation model in diesel Spray
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#1 |
Member
bilal
Join Date: Mar 2014
Location: Germany
Posts: 30
Rep Power: 12 |
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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March 20, 2014, 12:58 |
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#2 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 |
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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March 21, 2014, 05:37 |
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#3 |
Member
bilal
Join Date: Mar 2014
Location: Germany
Posts: 30
Rep Power: 12 |
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 16:14. |
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Tags |
dieselspray, evaporation model, spray evaporation, spray model |
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