EFFECT OF A PROPELLER AND GAS DIFFUSION ON BUBBLE NUCLEI DISTRIBUTION IN A LIQUID

(整期优先)网络出版时间:2012-06-16
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Amulti-bubbledynamicscodeaccountingforgasdiffusionintheliquidandthroughthebubblewallwasdevelopedandusedtostudythemodificationofabubblenucleipopulationdynamicsbyapropeller.ThepropellerflowfieldwasobtainedusingaReynolds-AveragedNavier-Stokes(RANS)solverandbubblenucleipopulationswerepropagatedinthisfield.Thenumericalpro-cedureenabledestablishmentofthepossibilityofproductionbehindthepropellerofrelativelylargevisiblebubblesstartingfromtypicaloceannucleisizedistributions.Theresultinglargerbubblesareseentoclusterinthebladewakesandtipvortices.Parametricinvestigationsoftheinitialnucleisizedistribution,thedissolvedgasconcentration,andthecavitationnumberwereconductedtoide-ntifytheireffectsonbubbleentrainmentandtheresultantvoidfractionsandbubbledistributionmodificationsdownstreamfromthepropeller.Imposedsyntheticturbulence-likefluctuationsuntotheaverageRANSflowfieldwerealsousedtostudytheeffectavera-gingintheRANSprocedurehasontheresults.