基于微喷射流的高功率led芯片散热的-研究

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1、AbstractForLED，itslOWlurninousefficiencyresultsfromnoeffectiveheatdissipation．Asaresult,itisveryurgentandnecessarytosolveitsheatdissipationproblem．Microjetsystemadoptsin零ingingjetwhichhasagoodheattransfercoefficient．Inaword，microjetsystemcanbeapotentialsolutiontoh

2、eatdissipationproblemofLEDwith魏ighpower．Inthisarticle，microjetdevicewillbethemaintopic．Withnumericalsimulation,astudywillbedoneonthefollowingaspects：theeffectofchipheatdensity,theeffectofinletflo、玛theeffectofmicrojetclassnumber,theeffectofmicrojetradius，theeffecto

3、fupper-downbodysizeonmicrojetdevice，andtheeffectofinletwatertemperature．Ifinletflowspeedis0．8m／sandchipsclassnumberis2x2，theeffectofheatdissipationwillbebetterwithmicrojetclassnumber2x2comparingwithotherclassnumbersandwhentheradiusofthenozzleis0．2mm，theeffectofhea

4、tdissipationisthebest．Itisbetteriftheheightofupperanddownbodycanbeassmallasposs稻le．Whentheheightofupperanddownbodygetssmaller,theeffectofheatdissipationcanbebetteraccordingly．Tooptimizethestructureofthemicrojet,astudywillbedoneonthefollowingaspects：theeffectofinle

5、t&outletnumber,theeffectoftheshapeofmicrojetdevice，theeffectofchipsetnumber,aswellasthecomparisonofthestructurewithoutmicrojet。ComparedtoOneinletandOneoutlet,theeffectofheatdissipationisbetterifthereisOneinletbuttwooutlets．Amongthethreearrangements，theeffectistheb

6、estiftwoinletsaleonastraightlineandinletisverticaltotheoutlet．WhentheshapeofthenozzleisCOne，theeffectofheatdissipationwillbeworseiftheproportionofupper&downradiusincreases．Thesrmllertheproportionofupper&downradiusis．thebetteritis。Surely,whenmicrojetisdoingheatdiss

7、ipation,itisverynecessarytochooseasuitableclassnumberandradiusofmicrojet．Otherwise，theeffectcanbeevenworsethanwatercooling．Intheabovesimulation,workingmediumiswater．Thearticlestudysrefrigerantastheworkingmediumfirsttime。Accordingtothebackgroundandprinciplewhenchoo

8、singrefrigerant,thefollowingcommonsixOnesalethepreliminaryoptions。TheyareR22，R123，R134a，R290，R407CandR410A．Analysistheperformanceofeveryrefrigerant,prov