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采用大涡PIV研究Taylor-Couette流及其对混凝过程的影响.docx

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采用大涡PIV研究Taylor-Couette流及其对混凝过程的影响 Title:InvestigationofTaylor-CouetteFlowandItsInfluenceonFlocculationProcessusingLarge-scaleParticleImageVelocimetry(PIV) Abstract: Taylor-Couetteflowisafundamentalfluidflowpatterngeneratedbetweentwoconcentricrotatingcylinders.ThispaperaimstoinvestigatethecharacteristicsofTaylor-Couetteflowanditsinfluenceontheflocculationprocessusinglarge-scaleParticleImageVelocimetry(PIV).ThestudyprovidesinsightsintothecomplexflowdynamicsofTaylor-Couetteflowanditspotentialapplicationsinimprovingflocculationoperationsinwatertreatmentprocesses. 1.Introduction: Taylor-Couetteflowisawell-knownsystemforanalyzingthebehavioroffluidflowbetweenconcentricrotatingcylinders.Ithasbeenextensivelystudiedforunderstandingvariousfluidflowphenomenasuchastransitiontoturbulence,flowinstabilities,andconvectiveheattransfer.Inrecentyears,researchershavebegunexploringthepotentialofTaylor-Couetteflowinenhancingflocculationprocessesinwatertreatment. 2.ExperimentalSetup: Alaboratory-scaleTaylor-Couettesystemwasdesignedandfabricatedforthisstudy.TheinnerandoutercylindersweremadeoftransparentmaterialstofacilitateopticalaccessforPIVmeasurements.Theworkingfluidwaspreparedtomimicthewatertreatmentprocess,andprimaryflocswereaddedtosimulateflocculation.ThePIVsetupconsistedofapowerfullightsource,ahigh-resolutioncamera,andalasermoduleforparticletracking. 3.CharacterizationofTaylor-CouetteFlow: Thelarge-scalePIVmeasurementsallowedforthedetailedcharacterizationoftheTaylor-Couetteflowfields.Quantitativemeasurementsofvelocityandvorticityprofileswereobtainedtoanalyzetheflowstructure,suchastheformationofTaylorvortices,boundarylayerformation,andflowinstability.Differentoperationalparameters,suchascylinderrotationspeedsandfluidviscosities,werevariedtoobservetheirimpactontheflowpatterns. 4.InfluenceonFlocculationProcess: TheinfluenceofTaylor-Couetteflowontheflocculationprocesswasassessedbasedonbothqualitativeandquantitativeanalysis.TheflowpatternsinducedbyTaylorvorticeswerefoundtoenhancecollisio