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1、InternationalJournalofMultiphaseFlow33(2007)1126–1139www.elsevier.com/locate/ijmulflowAfractalanalysisofsubcooledflowboilingheattransfera,ba,*BoqiXiao,BomingYuaDepartmentofPhysics,HuazhongUniversityofScienceandTechnology,1037LuoyuRoad,Wuhan430074,Hubei,PRChinabDepartmentofPhysics
2、andElectromechanicalEngineering,SanmingUniversity,25JingdongRoad,Sanming365004,Fujian,PRChinaReceived18July2006;receivedinrevisedform8April2007AbstractAfractalmodelforthesubcooledflowboilingheattransferisproposedinthispaper.Theanalyticalexpressionsforthesubcooledflowboilingheattr
3、ansferarederivedbasedonthefractaldistributionofnucleationsitesonboilingsurfaces.Theproposedfractalmodelforthesubcooledflowboilingheattransferisfoundtobeafunctionofwallsuperheat,liquidsubcooling,bulkvelocityoffluid(orReynoldsnumber),fractaldimension,theminimumandmaximumactivecavit
4、ysize,thecontactangleandphysicalpropertiesoffluid.Noadditional/newempiricalconstantisintroduced,andtheproposedmodelcontainslessempiricalconstantsthantheconventionalmodels.Theproposedmodeltakesintoaccountallthepos-siblemechanismsforsubcooledflowboilingheattransfer.Themodelpredicti
5、onsarecomparedwiththeexistingexperi-mentaldata,andfairagreementbetweenthemodelpredictionsandexperimentaldataisfoundfordifferentbulkflowrates.Ó2007ElsevierLtd.Allrightsreserved.Keywords:Subcooledflowboiling;Fractal;Heattransfer1.IntroductionThesubcooledflowboilingiswidelyappliedinen
6、gineeringandtechnology.Inthedevelopmentofmoderncoolingsystemssuchasinternalcombustionengines,powerengineering,nuclearreactorsandmicroproces-sors,theincreasingoutputofspecificpowercombinedwithamostcompactspaceandweightsavingdesignleadstohighthermalloadsonheatingsurfaces.Forsuchde
7、vices,ahighcoolantpoweristoberequiredwithlimitationsontheavailablesurfaceareaandthemassfluxofliquidcoolantaswellastheacceptablewalltem-perature,andacontrolledoperatingmodetotheboilingregimeisdesirable.Insubcooledflowboilingheattransferitisgenerallyrecognizedthattherearethreemainm
8、echanismscon-tributingtothewallheatflux(qW):single-phas
