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1、北京交通大學(xué)碩士學(xué)位論文脈動(dòng)熱管傳熱特性實(shí)驗(yàn)研究姓名：李燕申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：環(huán)境工程指導(dǎo)教師：賈力20081201北京交通大學(xué)碩士堂堡笙窒壘里璺里墜竺!——————二_———————————————————————————‘————————————。————————————————————一ABSTRACTPulsatingheatpipe(PHP)isanewtypeofheatpipes，especiallysuitedforthenlicro．ele咖11icscoolingofhighheatflux．Differentfrom
2、conventionalheatpipes，heatt舳sferofPHPincludeslatentheatandsensibleheat．Thetwo—phasesystemwhichembodiesmulti．disciplinaryphysicsisSOcomplicatedthattheinvestigationonPHPsisstillataprimarystage．OscillationmechaIljsmandheattransfercharacteristicsofpulsatingheatpipearesnJdiedint
3、hispaper．EffectsofsomefactorsinfluencingontheperformanceofPHPsareinvestigated．Andtheoscillationregularityisanalyzedpreliminarily．IIltllevisualizedexperimental，topheatmodevisualizingexperimentalsystemwasestablishedfirstly．Themainflowmodeintopheatmodeisbulkflowinsteadofannula
4、rflowwhichappearsinbottomheatmode．IntopheatmodetherearemanyTaylortypebubblesdistributinginevaporatorsectionwhileinbottomheatingmodetherearemanyglobetypebubblesdistributinginevaporatorsection．ItiseasiertOgeneratenewbubbleson吐Iewallaroundsmallglobebubblesinevaporatorsection·I
5、tmakesthestart．．upmuchharderfortopheatmode．FortheexperimentalofulleventunerdiameterPHP，itiseasiertOmaintainannularflowatthestablestate．‘TherunningandheattransferofcopperloopedandUll—loopedPHPsunderwatercoolingconditionwereinvestigated．Effectsoffillingratio，inputpower,workin
6、gfluid，協(xié)clineangleandturnsonheattransferperformancewerestudied．TheexperimentalresultsiIldicatethatfortheworkablefillingratiothermalresistanceincreaseswithfillingratio．Whenusingwater，ethanolandacetoneasworkingfluid，thethermalresistallceofPHPwithacetoneisthelowest,thestart·up
7、timeofPHPwithacetoneismeshortest．ThethermalresistanceofPHPinverticalbottomheatisthelowestforallinclineangles．a(chǎn)ndtheheattransferperformanceofloopedPHPisbetterthanun。loopedPHPsinceitiseasertOformcirculationflowinloopedP腫．KEYWORDS：pulsatingheatpipe；topheatmode；heattransferperf
8、ormance；affectingfactors；thermalresistance．CLASSN0：TKl24學(xué)位論文版權(quán)使用授權(quán)書(shū)本學(xué)位論文作者完全了解北京交通
