采用烧结Ni微纤多孔结构材料的微型换热器及其性能李剑锋

　20073612　　　　　　　　　PETROCHEMICALTECHNOLOGY[]2006-06-26;[]2007-08-29。[](1978—),,,,021-62233882,[e-mail]。:,021-62233424,[e-mail]。[](20573036,20590366);“”(NCET-06-0423);“”(06SG028);2007。Ni李剑锋,路　勇,何鸣元(,200062)[]Ni(Ni),,。,Ni,2;Ni,;。Ni95.1%、0.3mm、0.1mm、14.6L/h,40.0MW/(m3·K),20kW/(m2·K),0.2MPa。[];;;;[]1000-8144(2007)12-1239-05　　　[]TQ051.5　　　[]AMicroHeatExchangerwithaNovelSinteredNiMicrofibrousStructuredWickandItsPerformanceLiJianfeng,LuYong,HeMingyuan(ShanghaiKeyLaboratoryofGreenChemistryandChemicalProcesses,DepartmentofChemistry,EastChinaNormalUniversity,Shanghai200062,China)[Abstract]Ahigh-performancemicroheatexchangerhasbeenconstructedbyusinganovelmicrofibrousstructuredwick.Influenceofmicroheatexchangerstructureparametersonheattransfercoefficientandpressuredropwaspresented.Heattransferperformanceofmicroheatexchangercouldbeenhanceddramaticallybyusingamonolithicmicrofibrousstructureconsistingofnickelfiber8μmindiameter.Theuseofthisapproachprovided2-foldormoreincreaseinvolumetricheattransfercoefficientundersameoperationalconditions.Reductionofmicrofibrousstructureporosityandflowchanneldepthpromotedheattransferperformancebutcausedlargepressuredrop.Moreover,useofthinnerheattransferplatemadeofcopperwithhigherthermalconductivitycoefficientalsoprovidedsignificantpromotionofheattransferperformanceathighflowrate.Underoptimalstructureofmicroheatexchangerasmicrofibrousporosity95.1%,flowchanneldepthof0.3mm,copperheatexchangeplatethicknessof0.1mmandwatervolumeflowrateof14.6L/h,volumetricheattransfercoefficient,overallheattransfercoefficientandpressuredropcanbe40.0MW/(m3·K),20kW/(m2·K)and0.2MPa,respectively.[Keywords]sinterednickelmicrofiber;porousmaterial;nickelfiber;microheatexchanger;heattransferperformance　　100μm1mm,、、、,1～2。,、、、[1～3]。,,、·1239·　　　　　　PETROCHEMICALTECHNOLOGY　　　　　200736,、,[4～10]。、,[4,11～13]。,;,,。Ni(Ni),Ni、、。1　1.1　Ni5g8μm、2～3mmNi1.67g,1L,,110℃,450℃,H2950℃1h,Ni。Ni1。1a,Ni,;1b,,Ni。(a)CompositesheetofNiandcellulosefiberdriedat110℃inair(b)SinteredNimicrofibersheetpreoxidatedinairat450℃for0.5handthensinteredinH2at950℃for1h1　NiFig.1　OpticalmicroscopicphotographsofmicrofibrousstructureandsinteredNimicrofiber.1.2　Ni2。24mm、24mm、0.3～1.0mm,9.4mm、13.0mm、0.3～1.0mmNi。、3,,0.1～1.0mm。,(),,。1.3　3。、。,;,,;。。41.0mm-(K);40.25、0.1MPa0.6MPa。,。2　NiFig.2　StructureofmicroheatexchangerfillingwithsinteredNimicrofiber.　　±0.2℃,1.0%,0.0019MPa,5%·1240·　12.Ni,。Ni(φ)、(KV)(KA):　　　　　　　　　φ=mρLWDC(1)　　　　　　　　　KV=QVΔTmN(2)　　　　　　　　　KA=QAΔTmN(3)3　Fig.3　Schematicdiagramofheatexchangeexperimentbetweencoldandhotwater.1　Hotwatertank;2　Hotwaterpump;3　Filter;4　Coldwaterpump;5　Coldwatertank;6　Microheatexchanger;T1,T2,T3,T4　Thermocouple;P1,P2,P3,P4　Precisemanometer2　2.1　NiNiKV4。4,Ni95.1%、14.6L/h,KV40.0MW/(m3·K),(φ=100%)KV(13.3MW/(m3·K))2。KA20kW/(m2·K),KA1～2,0.2MPa。Ni,Ni95.1%90.6%,KV。Ni,,,,。Ni,。Ni5。5,,Ni。,3.2L/h、Ni95.1%90.6%,0.056MPa0.128MPa。Ni,Ni,,。,Ni,,。Ni,Ni,,。2.2　67。67,KV。14.6L/h、1.0mm0.3mm,KV6.6MW/(m3·K)40.0MW/(m3·K),6。·1241·　　　　　　PETROCHEMICALTECHNOLOGY　　　　　200736,,,Ni,。,,,KV。2.3　KAKV89。89,(2L/h),KAKV;,。400W/(m·K)14W/(m·K),。,KV,KA。,,,KAKV。3　(1),Ni。Ni,。(2):Ni95.1%,0.3mm,0.1mm;14.6L/h,KV40.0MW/(m3·K),KA20kW/(m2·K)。　　　A,m2DC,mmKA,kW/(m2·K)·1242·　12.NiKV,MW/(m3·K)LNi,mmNi,kgΔp,MPaQ,WTP,mmV,m3WNi,mΔTmN,KρNi,kg/m3φNi　　　1　DameanN,RegtienPP,ElwenspoekM.HeatTransferinaMEMSforMicrofluidics.SensActuators,A,2003,105(2):137～1492　SchneegassI,KohlerJM.Flow-ThroughPolymeraseChainReac-tionsinChipThermocyclers.RevMolBiotechnol,2001,82(2):101～1213　DelsmanER,deCroonMHJM,KramerGJ,etal.Experi-mentsandModellingofanIntegratedPreferentialOxidation-HeatExchangerMicrodevice.ChemEngJ,2004,101(1～3):123～1314　,,..,2003,20(2):8～125　MoriniGL.Single-PhaseConvectiveHeatTransferinMicrochan-nels:AReviewofExperimentalResults.IntJThermSci,2004,43(7):631～6516　JiangPeixue,FanMinghong,SiGuangshu,etal.Thermal-HydraulicPerformanceofSmallScaleMicro-ChannelandPorous-MediaHeat-Exchangers.IntJHeatMassTransfer,2001,44(5):1039～10517　ShenSheng,XuJinliang,ZhouJijun,etal.FlowandHeatTrans-ferinMicrochannelswithRoughWallSurface.EnergyConversManage,2006,47(11～12):1311～13258　GaoPuzhen,StephaneLP,MichelFM.ScaleEffectsonHydro-dynamicsandHeatTransferinTwo-DimensionalMiniandMicro-channels.IntJThermSci,2002,41(11):1017～10279　KandlikarSG.FundamentalIssuesRelatedtoFlowBoilinginMinichannelsandMicrochannels.ExpThermFluidSci,2002,26(2～4):389～40710　,,..,2005,56(10):1849～185511　,..(A),2003,18(3):276～28212　TadristL,MiscevicM,RahliO,etal.AbouttheUseofFibrousMaterialsinCompactHeatExchangers.ExpThermFluidSci,2004,28(2～3):193～19913　,,..,2003,24(6):1016～1018(　)··。,,,,。20076Naftan。,,。。,,、、,、、,、、。。,,,,,,、。,、。、。、,20069,。,、,,。·1243·