水平管外套丝网壁面液体升膜形成机理及其特性研究

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1、中国海洋大学硕士学位论文水平管外套丝网壁面液体升膜形成机理及其特性研究姓名：何明珠申请学位级别：硕士专业：工程热物理指导教师：梅宁20080601ThestudyoftheformationandheattransferoftheriSingIiquidfiImoRthesurfaceofahorizontaImetalIiCmeshtubeAbstractobjectiveofthisstudyistoinvestigatetheformationoftherisingliquidfiImonthesurfaceo

2、fahorizontalmetallicmeshtubeanditscharacteristics．formationoftherisingliquidfilmcouldbeconsideredaslowReynoldsnumberflowofsingle-phasefluidanditsmathematicalmodelisestablishedusingNavier—Stokesequation．Thedistributionofthevelocityundertheevaporationoftheliquidf

3、ilmisachievednumericallyandthefactorsthatinfluencethecharacteristicsoftherisingliquidfilmhavebeenanalyzed．Besides，theexperimentisalsodonetoseetheflowstateoftherisingliquidfilm．Intheexperiment，themicroscopehasbeenusedtoobservetheformationandflowstateoftherisingl

4、iquidfilmonthesurfaceofahorizontalmetaliictube．Theaveragevelocityoftherisingliquidfilmisgotbyusingthetrackingmethod．Thetemperaturefieldofthesteadyandunsteadyprocessoftherisingliquidfilmisachievedbytheinfraredthermalimagerandtheinfluenceofthethermo—capillaryflow

5、hasbeenanalyzed．Establishheattransferequipmentofrisingliquidfilmonthesurfaceofahorizontalmetallictubeandthecircumferentialtemperatureofthesurfaceismeasuredby0．5mmarmoredthermocouplelaidusinglaserscanningtechnologytoachievethedistributionoftheheattransfer．OnthiS

6、basis，acombustiontrainutilizingtherisingliquidfilmisinventedanditsauxiliaryprogramisdeveloped．numericalandexperimentalresultsshowthatthecontinuousandevenrisingliquidfilmcanformbyusingahorizontalmetallicmeshtube，whichisinfluencedbymicrocapillarypressure，wettingf

7、orce，circumferentialtemperaturedifference，bubbles，andotherfactorscombined．Thevelocityoftherisingliquidfilmisalsoinfluencedbythesizeofthetubeandthegapbetweenthem．Thehorizontalmetallicmeshtubecouldstrengthentheheatandmasstransfer，whichhassomethingⅡtodowiththeheat

8、fluxandthemesh．ThestudyhasakeyroleOnthedesignofmicroandsuper—microcombustor．Keywords：horizontaImetaIIiCmeshtube：riSingfiIm：wetting；thermocapiIIaryforce：heattransferIlI水平管外套丝