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1、ChemicalEngineeringScience,1962,Vol.17,pp.291-305.PergamonPressLtd.,London.PrintedinGreatBritain.TheeffectofambientdensityondropformationinspraysN.DOMBROWSKIandP.C.HOOPERiDepartmentofChemicalEngineering,ImperialCollege,London,S.W.7(Receiued18April1961)Abstract-Astudyhasbeenmadeofthestabilityand
2、disintegrationofflatsheetsproducedbysingle-holespraynozzlesatvariousdensitiesofthesurroundingair.Itisshownthataflatlaminarsheetinjectedinvacuaisstable,andthatdropsareformedonlyatitsedges;theprematurebreakdownreportedearlierhasbeenfoundtobeduetoexternalcauses.Athigherairdensitiesthesheetisdisrup
3、tedbyaerodynamicwavesandprevioustheoriespredictingtheirwavelengthandgrowthhavebeenextendedtoshowthattheformofthecontrollingequationiscriticallydependentontheoperatingconditions;experimentalverificationispresentedforthesefindings.Theoreticalexpressionsforthesizeofdropsgroducedfromfanspraysheetsh
4、avealsobeendeve-loped.Thesedemonstratethesurprisingresultthatundercertainoperatingconditions,thedropsizeincreaseswithambientdensity.Thispredictionhasbeenverifiedexperimentally,thedropsizeinitiallydecreasing,butpassingthroughaminimumwithfurtherincreaseofambientdensityINTRODUCTIONstable.Inpractic
5、e,spraynozzlesproduceattenuat-THEsprayingofliquidsformsanintegralpartofingliquidsheetswhichusuallybecomeunstablemanyprocessesinagricultural,combustionandbythegrowthofwaves,causedbyaerodynamicchemicalengineering,andmuchdataisavailableforces(Fig.1).However,becauseofthecomplexitytothedesigneronthe
6、performancecharacteristicsofthephenomenaithasonlyprovedpossibleofspraynozzlesinthequiescentambientatmo-[l,21toanalysetheconditionsofinstabilityforasphere.However,inmanyapplications,spraysaresheetwhosethicknessremainsconstantasitmovesproducedunderawidevarietyofconditions,theawayfromitsorigin.spr
7、aynozzlebeingsituatedforexample,inhighInthispaper,anattempthasbeenmadetoapplyvelocitygasstreams,andatmospheresofloworthesolutionstotheattenuatingsheetproducedhighdensityandtemperature;littleinformationisfromasingle-holefanspraynoz
