Mathematical modelling and simulation for the drying process of vegetable

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1、JournalofFoodEngineering59(2003)151–160www.elsevier.com/locate/jfoodengMathematicalmodellingandsimulationforthedryingprocessofvegetablewholesaleby-productsinarotarydryera,*bcbaA.Iguaz,A.Esnoz,G.Martıınez,A.Loopez,P.VıırsedaaAreasdeTecnologııadeAlimentose,UniversidadPublicadeNavarra,

2、CampusArrosadııa,s/n,31006Pamplona,SpainbAreadeTecnologııadeAlimentos,UniversidadPolitecnicadeCartagena,PaseoAlfonsoXIII,44,30203Cartagena,SpaincIngenierııadeSistemasyAutomatica,UniversidadPublicadeNavarra,CampusArrosadııa,s/n,31006Pamplona,SpainReceived1March2000;receivedinrevise

3、dform29May2001;accepted15April2002AbstractDisposalofagriculturalandagro-foodindustryby-productshasbecomeanincreasingenvironmentalproblem.Dryingisoneofthepossibleconditioningprocessesthatcanbeappliedtotheseby-productsbeforeusingthemascattlefeedorsoilconditioner.Inthispaper,adynamicmodeltos

4、imulatethedehydrationprocessofwastesofvegetablefromawholesalemarketinarotarydryerisproposed.Thedryerwasdividedinto10sectionsandmassandenergybalanceswereestablishedineachofthem.Theresultshavebeenvalidatedinasemi-industrialdryer.Themodelpredictsairandproductmoistureandtemperaturedependingon

5、workingconditionsoftherotarydryer.Inletairtemperaturehasbeenshowntobethevariablethathasthegreatesteffect,onbothoutletmoisturecontentoftheproductandonoutletairtemperature.Ó2003ElsevierScienceLtd.Allrightsreserved.Keywords:Vegetableby-products;Modelling;Rotarydryer;Simulation1.Introductionro

6、tarydryingprocess.Staticmodelsareingeneraldif-ferentialequationsandtheyaresuitableforinvestiga-Inwholesalemarketsgreatvolumesoforganicby-tionofstaticdistributions.Myklestad(1963)wastheproductsareproduced.Vegetableby-productscon-firsttoobtainanexpressiontopredictproductmoisturestituteabigan

7、dveryproblematicportionofthesecontentthroughoutarotarydryerbasedondryingairby-productsbecauseofitshighspecificvolumeandtemperature,initialmoisturecontentandproductfeedmoisturecontent.Dryingandutilisationoftheseby-rate.Sharples,Glikin,andWarne(1964)developedaproductsa