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1、InternationalJournalofThermalSciencesxxx(2012)1e13ContentslistsavailableatSciVerseScienceDirectInternationalJournalofThermalSciencesjournalhomepage:www.elsevier.com/locate/ijtsCFDsimulationontheeffectofprimarynozzlegeometriesforasteamejectorinrefrige
2、rationcycleaaa,*bNatthawutRuangtrakoon,TongchanaThongtip,SathaAphornratana,ThanarathSriveerakulaSirindhornInternationalInstituteofTechnology,ThammasatUniversity,POBox22,ThammasatRangsitPostOffice,Patumthani12121,ThailandbDepartmentofMechanicalEngineer
3、ing,UbonRatchathaniUniversity,Ubonratchathani34190,ThailandarticleinfoabstractArticlehistory:Inthisstudy,theCFDtechniquewasemployedtoinvestigatetheeffectoftheprimarynozzlegeometriesReceived8December2011ontheperformanceofanejectorusedinthesteamjetrefr
4、igerationcycle.Inallcases,onlyonefixed-Receivedinrevisedformgeometrymixingchambertogetherwitheightdifferentprimarynozzleswasinvestigatednumerically23July2012usingthecommercialCFDpackage,FLUENT6.3.Theeffectsontheprimaryfluidpressure,massflowrateAccepted2
5、3July2012andMachnumberwereobservedandanalyzed.TheMachnumbercontourlineswereusedtoexplainAvailableonlinexxxthemixingprocessoccurringinsidetheejector.Itwasfoundthatshock’spositionofthemixedfluidandtheexpansionangleoftheprimaryfluidjetstreamwithinthemixin
6、gchamberplayedaveryimportantKeywords:roleintheejectorperformance.EjectorJetrefrigerationÓ2012ElsevierMassonSAS.Allrightsreserved.JetcoolingCFDPrimarynozzle1.IntroductionPerformanceofthesteamjetrefrigerationisdefinedintermsofthecoefficientofperformance(
7、COP):Asteamjetrefrigerationsystemisaninterestingheat-poweredrefrigerationsystemduetoitsenvironmentalfriendlyoperatinghgevaphfconCOP¼Rm$(1)character.Itcanconvertwasteheat(low-gradethermalenergy)hgboilerhfconthatisrejectedfrommanyindustrialproces
8、sestousefulrefriger-ation,therebyreducingtheelectricalenergyconsumptionofthewhereRmisdefinedastheentrainmentratiooftheejector:air-conditioningsystem.Anotheradvantageisthatwater,themostenvironmentalfriendlysubstance,canbeusedastheworkingfluidRm¼massflow
