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基于ANSYSFluent的气流喷雾干燥研究与仿真（英文）.docx

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基于ANSYSFluent的气流喷雾干燥研究与仿真（英文） Introduction Spraydryingisawidelyusedprocessinthefood,pharmaceutical,andchemicalindustriestoconvertliquidorslurrymaterialsintopowder.Duringtheprocess,aliquidorslurrymaterialisatomizedintosmalldropletsandthensprayedintoahotairflowtoevaporatethemoistureandsolidifytheparticlesintopowder.Thequalityofthefinalproductdependsonseveralfactorssuchasthedropletsize,feedrate,airflowvelocity,andtemperature.Therefore,itiscrucialtounderstandthefluiddynamicsandheattransferbehaviorduringtheprocesstooptimizetheprocessparametersandproductquality.Inthisstudy,weuseANSYSFluentsoftwaretosimulateandanalyzethefluiddynamicsinaspraydryer. Methodology ThegeometryofthespraydryerisdesignedusingANSYSDesignModelersoftware.Themodelconsistsofacylindricaltower,anatomizeratthetop,andacone-shapedbottomforcollectingthepowder.Theairflowentersfromthebottomandrisesupthroughthetower.Theliquidfeedisatomizedintosmalldropletsusingapressurenozzleandinjectedintotheairflow. TheFluentsoftwareisusedtosimulatetheflowbehaviorandheattransferinthespraydryer.Thegoverningequationsofthesystem,includingthecontinuity,momentum,andenergyequationsaresolvedusingthefinitevolumemethod.Thestandardk-epsilonturbulencemodelisusedtoaccountfortheturbulenceoftheflow. ResultsandDiscussion Thesimulationresultsshowthattheairflowvelocityandtemperaturedistributionarenotuniforminthespraydryer.Thevelocityishighnearthewallsofthetoweranddecreasestowardsthecenter.Thetemperatureishighnearthetopofthetowerwherethehotairentersanddecreasestowardsthebottom.Thedropletsinjectedintotheairflowfollowthesameflowpatternandmovedownwardsduetogravity.Thedropletsgetdriedupandsolidifyastheymovedownwardsandreachthebottomofthetowerwheretheyaccumulateaspowder. Thedropletsizeanddistributionhaveasignificantimpactonthequalityofthefinalproduct.Inthesimulation,wevarythedropletsizeandobservetheeffectontheproductquality.Itisfoundthatsmallerdropletsresultinafinerpowder,butthedryingtimeincreases,whichmayreducetheproductionrate. Conclusion Inthisst