毛細(xì)泵回路流動與換熱機(jī)理研究

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1、南京理工大學(xué)博士學(xué)位論文毛細(xì)泵回路流動與換熱機(jī)理研究姓名：錢吉裕申請學(xué)位級別：博士專業(yè)：工程熱物理指導(dǎo)教師：宣益民20051220摘要博士論文CPL系統(tǒng)的反重力性能，結(jié)果表明，當(dāng)前的小型化CPL系統(tǒng)在2．0米反重力高度可以傳輸超過150W的熱量。根據(jù)實(shí)驗(yàn)現(xiàn)象分析了系統(tǒng)中溫度波動的起因以及充液率對系統(tǒng)性能的影響。另外，數(shù)值模擬結(jié)果與實(shí)驗(yàn)結(jié)果也進(jìn)行了對比，進(jìn)一步驗(yàn)證了上述數(shù)值模型的正確性。5．孔隙尺度研究毛細(xì)芯中熱量和質(zhì)量的傳遞過程探索性地運(yùn)用Lattice-Boltzmann(LB)方法，從孔隙尺度研究了多孔毛細(xì)芯內(nèi)熱量和工質(zhì)傳遞過程。當(dāng)前的研究結(jié)果表明，L

2、B流動模型和熱模型的精度都較高，適合用于研究CPL和LHP毛細(xì)芯內(nèi)復(fù)雜的能量與質(zhì)量傳遞過程，并行模型的運(yùn)用使該數(shù)值計(jì)算方法更有效。本文還介紹了一種基于圖像分析以及傅立葉變換的三維毛細(xì)芯的計(jì)算機(jī)重構(gòu)技術(shù)，并應(yīng)用該技術(shù)成功地重構(gòu)出了具有已知毛細(xì)芯的特征的三維“數(shù)字化”毛細(xì)芯，為利用LB方法計(jì)算CPL和LHP毛細(xì)芯中復(fù)雜孔隙間工質(zhì)流動與能量傳遞過程奠定了基礎(chǔ)。關(guān)鍵詞：CPL，LHP，毛細(xì)芯，反重力，蒸發(fā)器，LB模型Ⅱ博士論文毛鯫象鞠豁流動與揍熱楓理研究ABSTRACTCapillaryPumpedLoops(CPLs)andLoopHeatPipes(LI-IP

3、s)aretwo-phaseheattransportdeviceswMchutilizetheeapiUaryforcesdevelopedinevaporator謝ck協(xié)drivetheworki端fluid。They&recapableoftransferringlargeheatloadsoverlongdistances、啦也smalltemperaturedifferentials．BothCPLsandLHPsareconsidered幻bemostpromisingthermalcontroldevicesofspacecraftsinth

4、efuture．ThepurposeofthisthesisistOinvestigateoperationalmechanismsoftheevaporatorandthewholesystem,optimizethedesignandtesttheoperationcharacteristicsofsmall·scaleCPLsandLI-IPs．Theinvestigationisfocusedonthefollowingaspects．I．NumericalinvestigationoftheporouswickandevaporatorA2Dge

5、neralizedmathematicalmodelisgiven,whichincludescoupledheatandmasstransferprocessintheporous、ⅣickWiththismodel．thetemperaturefield,liquid-vaporfrontandvelocityfieldcouldbeeasilysimulate&whichrevealsthephysicaloperationalmechanismsoftheporouswicLA3Dnmnericalmodeloftheevaporatorisdev

6、elopedwithsoftwareFLUENT．Theheatandmasstransferprocessesintheevaporatorwithdifferentstructurearecalculatedanddiscussed．ThenumericalresultswillguidetheevaporatordesignofCPLsandLHPs。2．AnalyticalinvestigationofCPLandLHPsystemAmathematicalmodelisproposedtopredictthesteady—stateperform

7、ancecharacteristicsoftheLHP．Somefactorsofaffectingtheoperationaltempermnre。suchastemperatureofheatsink,temperatureofambientandadverseheight,a糟included．AtransientmodelisdevelopedtOpredictthethermalanddynamicbehaviorofaCPL．ThismodelcanbeusedtOexplainthestarbupprocessfailureandtheeva

8、poratordeprimingwhenabruptchangeo