Flash-boiling atomization

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1、ARTICLEINPRESSProgressinEnergyandCombustionScience34(2008)417–439www.elsevier.com/locate/pecsFlash-boilingatomizationEranSher,TaliBar-Kohany,AlexanderRashkovanSirLeonBagritProfessor,ThePearlstoneCenterforAeronauticalStudies,DepartmentofMechanicalEngineering,Ben-GurionUniversi

2、ty,Beer-Sheva,IsraelReceived1May2007;accepted10May2007Availableonline3December2007AbstractFlash-boilingatomizationisoneofthemosteffectivemeansofgeneratingafineandnarrow-dispersedspray.Owingtoitscomplexityitspotentialhasnotbeenfullyrealizedtodate.Thepaperreviewsthepresentknowled

3、geofthedifferentmechanismsinvolvedintheflash-boilingatomizationprocess.Theseincludeintensenucleation,fastbubbles’growthandliquidatomization.Theinter-relationshipsbetweenthedistinctiveprocessesdeterminethesprayquality.Recentexperimentalobservationsandphysicalinterpretationshavei

4、mprovedourinsightandledtobetterunderstandingofthewholeprocess.Onepracticalresultistheestablishmentofdesigncriteriaforanoptimalflash-boilingatomizingsystem.r2007ElsevierLtd.Allrightsreserved.Contents1.Introduction..................................................................

5、.............4182.Nucleation................................................................................4193.Bubblegrowth.............................................................................4213.1.Growthrate..........................................................

6、.................4213.2.Factorsinfluencingbubblegrowth...........................................................4234.Two-phaseflow.............................................................................4254.1.Simpleanalyticalmodelsandflowpatterns............................

7、.........................4254.2.Flowofatwo-phasefluidthroughanaperture..................................................4264.2.1.Aspectratiolowerthan5(l/dp5).....................................................4264.2.2.Aspectratioof5–10(l/d45)...................................

8、......................4264.3.Chokedflowofatwo-phasefluidthrough