2018傳熱傳質(zhì)學(xué)年會(huì)集

，，( 規(guī)律，但其導(dǎo)熱效果要好于Maxwell模型，分析認(rèn)為是由于石墨烯獨(dú)特的片層結(jié)構(gòu)導(dǎo)致的。的廣泛認(rèn)同[1-11]。1995年，Choi等人[1]首次將納米顆粒添加到流體中發(fā)現(xiàn)其能顯著提高流體基液的換熱性能。Masuda[4]Al2O3-water、SiO2-water、TiO2-water等納米流體進(jìn)行納米流體具有更好的傳熱性能[7]。湘等[10]通過(guò)實(shí)驗(yàn)研究發(fā)現(xiàn)通過(guò)球磨處理過(guò)后的碳2.79%Wen等[11]0.8%濃度的碳納米管納米25%。的關(guān)注[12-18]。Amiri等[12]以水、乙二醇混合液為基液配制成石墨烯納米流體，發(fā)現(xiàn)其在0.1%65%，Baby等[13]以去離子水為基液配50℃0.05%時(shí)，相比基液的導(dǎo)熱系數(shù)提高了75%。Naghash等[15]0.1%水基石墨烯納米流體的導(dǎo)熱系數(shù)僅3.8%34%，并認(rèn)為導(dǎo)熱系數(shù)沒(méi)有較大的提升可能是 ）;省教育廳重點(diǎn)科研項(xiàng)SE14301 圖1石墨烯的SEM 圖2石墨烯的XPS（XPS（TGAOH3SE1430450℃

3，50度下進(jìn)行超聲水浴，配制成不同質(zhì)量濃度的水基石墨烯納米流體[21]。并通過(guò)多功能體視顯微鏡（OM奧林巴斯公司）對(duì)溶液進(jìn)行了簡(jiǎn)單的形，

4OM5pHpH6pHpH=2、6pHZeta電勢(shì)分界線在+30mv與-30mvZeta電位高于+30v或者低于-圖7-8為兩種濃度溶液的Zeta電勢(shì)，從圖中可以看出0.01%濃度的溶液Zeta電勢(shì)為-65.41mv，遠(yuǎn)低于-30mv0.1%Zeta70.01%Zeta

80.1%Zeta通過(guò)改良瞬態(tài)平面熱源法[22在環(huán)境溫度為26下對(duì)不同配比的石墨烯納米流體的0.1%1.5%的提升。MeasuredMeasuredMaxwellmodelThermalconductivityratio(kThermalconductivityratio(k/kThermalThermal

圖926℃時(shí)石墨烯納米流體的導(dǎo)熱系 圖10導(dǎo)熱系數(shù)增強(qiáng)實(shí)驗(yàn)與Maxwell模型對(duì)10模型計(jì)算結(jié)果規(guī)律相同，但是其導(dǎo)熱系數(shù)明顯高于Maxwell模型計(jì)算結(jié)果，分析認(rèn)為Maxwell模型是以納米粒子為球狀的條件下所得出的，而石墨烯納米粒子為片層結(jié)構(gòu)并體，實(shí)驗(yàn)并測(cè)試其進(jìn)行分散穩(wěn)定性及導(dǎo)熱性進(jìn)試分析，并得到如下結(jié)論：3%。ChoiSUS,EastmanJA.Enhancingthermalconductivityoffluidswithnanoparticles[J].AsmeFed.1995,231(1):99-105.KeblinskiP,EastmanJA,CahillDG.Nanofluidsforthermaltransport[J].MaterialsToday.2005,8(6):36-LeeSP,ChoiS,LiS,etal.MeasuringThermalConductivityofFluidsContainingOxideNanoparticles[J].JournalofHeatTransfer.1999,121(2):280-289.MasudaH,EbataA,maeK,etal.AltionofThermalConductivityandViscosityofLiquidbySiO2andTiO2Ultra-FineParticles[J].Jp.1993,7(4):227-233.KimD,KwonY,ChoY,etal.Convectiveheattransfercharacteristicsofnanofluidsunderlaminarandturbulentflowconditions[J].CurrentAppliedPhysics.2009,9(2):e119-e123.LiuMS,LinCC,WangCC.EnhancementsofthermalconductivitieswithCu,CuO,andcarbonnanotubenanofluidsandapplicationofMWNT/waternanofluidonawaterchillersystem[J].NanoscaleResearchLetters.2011,6(1):297.ChopkarM,DasPK,MannaI.Synthesisandcharacterizationofnanofluidforadvancedheattransferapplications[J].ScriptaMaterialia.2006,55(6):549-552.CarbonNanotubesBasedNanofluids[J].JournalofPhysicalChemistryC.2008,112(25):9315.InternationalJournalofThermophysics.2004,25(4):971-985. CHANGQiangQIUJinyou,etal.ExperimentalStudyonPreparationandWenD,DingY.EffectiveThermalConductivityofAqueousSuspensionsofCarbonNanotubes(CarbonNanotubeNanofluids)[J].JournalofThermophysics&HeatTransfer.2004,18(4):481-485.pot,microwave-assistedfunctionalizationforuseasahighperformanceenginecoolant[J].EnergyConversion&Management.2015,101:767-777.BabyTT,RamaprabhuS.Enhancedconvectiveheattransferusinggraphenedispersednanofluids[J].NanoscaleResearchLetters.2011,6(1):1-9.LinY,ZhangH,HeC,etal.Anewkindofwater-basednanofluidwithalowloadingofthree-dimensionalporousgraphene[J].JournalofMaterialsScience.2017,52(17):10485-10496.NaghashA,SattariS,RashidiA.Experimentalassessmentofconvectiveheattransfercoefficientenhancementofnanofluidspreparedfromhighsurfaceareananoporousgraphene[J].InternationalCommunicationsinHeat&MassTransfer.2016,78:127-134.HaqueAKMM,KwonS,KimJ,etal.Anexperimentalstudyonthermalcharacteristicsofnanofluidwithgrapheneandmulti-wallcarbonnanotubes[J].JournalofCentralSouthUniversityofTechnology.2015,22(8):mmadM,EmadS,TahanLS,etal.Investigationofthermalconductivityandrheologicalpropertiesofnanofluidscontaininggraphenenanoets[J].NanoscaleResearchLetters.2014,9(1):15.SelvamC,LalDM,HarishS.Thermalconductivityandspecificheatcapacityofwater–ethylenemixture-basednanofluidswithgraphenenanoets[J].JournalofThermalysis&Calorimetry.2017,129(2):1-9.liquid–solidphasetransitions[J].NatureCommunications.2011,2(1):289.HarishS,IshikawaK,ChiashiS,etal.AnomalousThermalConductionCharacteristicsofPhaseChangeCompositeswithSingle-WalledCarbonNanotubeInclusions[J].J.phys.chem.c.2013,117(29):15409-15413.ParkS,