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1、LiquidFlowonaRotatingDiskPriortoCentrifugalAtomizationandSprayDepositionY.Y.ZHAO,M.H.JACOBS,andA.L.DOWSONVideoobservationsofthe¯owpatternsthatdeveloponarotatingdiskduringcentrifugalatomizationandspraydeposition,andsubsequentmetallographicstudiesconductedonsolidsku
2、llsremovedfromthediskafterprocessing,haveindicatedacirculardiscontinuityorhydraulicjump,whichismani-festedbyarapidincreaseinthethicknessoftheliquidmetalandbyacorrespondingdecreaseintheradialvelocity.Amathematicalmodelhasbeendevelopedthatiscapableofpredictingbothth
3、eoccurrenceandlocationofthejump,andtheassociatedchangesinthethicknesspro®leandintheradialandtangentialvelocitiesoftheliquidmetal.Goodcorrelationshavebeenobservedbetweenmodelpredictionsandthe¯owpatternsobservedontheskullafteratomization,andtheeffectsofchangesinmate
4、rialandoperationalparameterssuchaskinematicviscosity,volume¯owrate,me-tallostatichead,anddiskrotationspeedhavebeenquanti®ed.Liquidmetal¯owiscontrolledpri-marilybythevolume¯owrateandbythemetallostaticheadpriortothehydraulicjumpandbythecentrifugalforcesafterthejump.
5、Theimplicationsoftheseobservationsintermsoftheatomizationprocessarediscussed.I.INTRODUCTIONcon®guredtooperateeitherunderreducedpressuresorinavacuumenvironment.Inthisrespect,theprocessoffersTHEpotentialbene®tsofsprayformingprocessesinbotheconomicandtechnicaladvanta
6、gesovergasassistedproducingmicrostructurallyre®ned,chemicallyhomoge-depositionprocessesinthattheproblemsassociatedwithneous,near-net-shapedcomponentsarewelldocu-gasentrapmentarevirtuallyeliminatedandprocessingmented.[1,2]Inthisrespect,sprayformingprocessesarecosts
7、arereducedbecausethereisnolongertheneedtouseknowntoofferbothcommercialandtechnologicaladvan-largequantitiesofexpensiveprocessgases.Inaddition,fur-tagesovertraditionalcast-wroughtprocessingroutes,par-thertechnologicaladvantagesstemfromthegreater¯exi-ticularlyinthep
8、rocessingofsomeofthemoreadvancedbilityincontrollingdropletsizedistribution,andhencematerialsofcurrentinteresttotheaerospaceindustry.Con-microstructurald
