Analysis of the air flow in a cold store by means of computational fluid dynamics.pdf

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1、InternationalJournalofRefrigeration23(2000)127±140www.elsevier.com/locate/ijrefrigAnalysisoftheair¯owinacoldstorebymeansofcomputational¯uiddynamicsM.L.Hoang*,P.Verboven,J.DeBaerdemaeker,B.M.NicolaõÈDepartmentofAgro-Engineeringand-Economics,K.U.Leuven,KardinaalMercierlaan92E,B-

2、3001Heverlee,BelgiumReceived14January1999;receivedinrevisedform19July1999;accepted22July1999AbstractAir¯owinsideacoldstoreisinvestigatedusingcomputational¯uiddynamics.Theair¯owmodelisbasedonthesteadystateincompressible,Reynolds-averagedNavier±Stokesequations.Theturbulenceistak

3、enintoaccountusingakÿ"model.ThestandardaswellastheRenormalisation-Group(RNG)versionofthekÿ"modelisinvestigated.Theforced-circulationaircoolerunitismodelledwithanappropriatebodyforceandresistance,correspondingtothecharacteristicsofthefanandthetube-bankevaporator.The®nitevolumem

4、ethodofdiscretisationisused.Thevali-dationofthemodelhasbeenperformedbyacomparisonofthecalculatedtime-averagedvelocitymagnitudeswiththemeanvelocitiesmeasuredbymeansofahot-®lmtypeomni-directionalvelocitysensor.Arelativeerroronthecalcu-latedairvelocitiesof26%wasobserved.TheRNGkÿ"

5、modeldoesnothelptoimprovethepredictionoftherecir-culation.Botha®nergridandenhancedturbulencemodelsareneededtoimprovethepredictions.#2000ElsevierScienceLtdandIIR.Allrightsreserved.Keywords:Coldstore;Airdistribution;Simulation;ComputerizedAnalysedudeÂbitd'airdansunentrepoÃtfrigo

6、ri®queaÁl'aidedeladynamiquedes¯uidesinformatiseÂeReÂsumeÂLedeÂbitd'airaÁl'inteÂrieurd'unentrepoÃtfrigori®queaeÂteÂeÂtudieÂaÁl'aidedeladynamiquedes¯uidesinformatiseÂe(CFD).LemodeÁledudeÂbitd'airestfondeÂsurlereÂgimepermanentincompressibleetdeseÂquationsdeNavier-Stokesaveclesmoy

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