气-液-固三相流载气蒸发传热的研究

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1、大连理工大学硕士学位论文气-液-固三相流载气蒸发传热的研究姓名：舒纪恩申请学位级别：硕士专业：化学工程指导教师：于志家19990601大连理工大学硕士学位论文HeatTransferofGasCarryingEvaporationwithHuidizedSofidParticlesUnderAtmosphel‘icPresureShujlen(ChemicalEngineeringDepartment,DalianUniversityofTechnology)ABSREACTCombmedwiththecharacteristicsoffluidizedbedh

2、eatexchangesandthatofGasc舒AngEvapomtion(GCE)，aprocesscalled‘'gas—liquid—solidthree-phaseGasCm-DingEvaporation”wasdevelopedbytheintroductionoffluidizedsohdparticlesintoGCEprocess．ExperimentalandtheoreticalanalyseswerecarriedoutOHtheheatu碰-tsferprincipleoftheprocess．Heatteamferexperime

3、ntswerecarriedoutinathree．phasenaturalcirculatin=systemwithallextemalloop．Thetestsectionconsistsofa酉瑟scolumnof50mmi．d．withaconcentricallyinsertedcylindricalheaterwhichiS28rammdiameterand700rammlongtU．Ajrwasadopedasthecanyinggasandwater笛theliquidtobeevaporated．Solidparticleswereglassb

4、alls．titaniumparticlesandsteelspheres．Theexperimentswereconductedunderatmosphericpresure．Parametersare诅thefollowingranges：superfacialcarr)，iIlggasvelocity：0-7mm／s(steelspheres：31-65mm／s)particlediameter：0～3ram．particleholdupinthehquid：0-10v01．％particledensity：2319-7143kg／m3hcatnux：32

5、．5～65．0kw／rn2Theinfluencesofcarryinggasvelocit3,particlesize，particledensil3；particleholdupiIlthehquidandheatfluxontheheattransfercoef五ciemofthe爨玛．hquid-sohdthree．phaseGCEprocesswereconsidered．刀鼯experimentalresultsshowthat曲eheattransferisremarkablyenhanced,thesuperheatoftheliquidatth

6、eheatingsurfaceobviouslvreducedandthenucleateboilingeffectivelysuppressedwiththeintroductionofthecarry证ggasandthesolidparticles．Theheattransferenhancementismainlycausedbytheagitationofthecarr35nggasbubblesandthefluidizedparticles，andalsoduetothedirectcollisionofsohdparticlesontothehe

7、atingwall．Theenhancementofheattransferbythe“interracialevaporativelleatsink～ofGCEprocessismuchincreasedwi也thefluidizedsolidparticles．Theheattransferexperimentaldatawerecorrelatedas：Nu=472：5[等厂2(是1C厂搿。5例D订4K0。85

8、、、y×段／{、一二／l、p／Ji＼。／j5大连理工大学硕士学位论文谢manaverageeITOrof4．64％Keywords：gas—·li

9、quid··solidt