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1、ModelingSprayBehavior:ToolsandApplicationsPreparedforFluentUGM2003byGenongLiOutline•Introductionofapplicationareas.•Basictheoryaboutparticletracing.•Atomizermodelsandsecondaryatomizationmodels.•Someexamples.2DispersedPhaseModel(DPM):Overview•Usetomodelparticles,droplets,orbubble
2、sdispersed(atlowvolumefraction)inacontinuousfluidphase.•Computetrajectoriesofparticle(ordropletorbubble)streamsincontinuousphase.•Computeheat,mass,andmomentumtransferbetweendispersedandcontinuousphases.•Assumethatdispersedphaseoccupieslowvolumefraction.Lessthan10%,butahighmasslo
3、adingisacceptable.•Assumethatparticlesenterandleavecomputationaldomain.Itshouldnotbeusedforcontinuoussuspensionorsettling.3DPM/SprayApplications-CategorizedbyPhysics•Particulateflows–Cyclones–Dryers–Pneumaticconveyors–Coal-firedfurnaces•Dropletflows–Sprays–In-cylinderflows–Combu
4、stors–Quenchers•Bubblyflows–Aerators;bubblecolumnsatlowvolumefractions4DPM/SprayApplications-CategorizedbyApplicationAreas•Productionorprocessing–Spraydrying–Spraycooling–Sprayreaction(absorption,roasting,etc.)–Atomizedsuspension(effluents,wasteliquors,etc.)–Powderedmetals•Treat
5、ments–Evaporationandaeration–Cooling(sprayponds,towers,reactors,etc.)–Humidificationandmisting–Airandgaswashingandscrubbing–Industrialwashingandcleaning5DPM/SprayApplications(Cont’d)•Coating–Surfacetreatment–Spraypainting–Flamespraying–Insulation,fibers,andundercoatingmaterials–
6、Particlecoatingandencapsulation•Powergeneration/combustion)–Oilburner,gasturbines,dieselandrocketfuelinjection•Miscellaneous–Medicalsprays–Dispersionofchemicalagents–Agriculturespraying–Foamandfogsuppression–Printingandacidetching6DPMEquations•Particleexchangesmass,momentum,ande
7、nergywithcontinuumphase.•Particletrajectorycalculation:dup=−+−+FuugDpx()()ρρρppFxdt•Heattransfer:dTdmppmcppp=−hATT()∞pf++hgSxdtdt•Masstransfer:•evaporation,boiling,reaction•Couplingbetweenphases:onewayvstwo-waycoupling7EffectsinDispersedSystems•Hydrodynamics–changeinshape–diamet
8、er–particle-particlecollision:coalescenceorbrea
