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Experimentalstudyondual - componentssolutestransportin
fluidswithconstantandvariabledensities
2,4
1,2
3
1,2
1
YEYu ,LIUSen,CAIFangmin,LUChunhui ,XIEYifan ,XUTeng 1,2
(1.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China;
2.TheNationalKeyLaboratoryofWaterDisasterPrevention,HohaiUniversity,Nanjing 210098,China;
3.FujianProvincialInvestigation,Design&ResearchInstituteofWaterConservancy&HydropowerCo.,Ltd.,Fuzhou 350000,China;
4.YangtzeInstituteforConservationandDevelopment,HohaiUniversity,Nanjing 210098,China)
Abstract:Inordertoaccuratelypredictthemigrationpathandconcentrationdistributionsofcontaminantsin
groundwatersystem ,itisnecessarytounderstandthedilutionandtransportofmulti - componentsolutesunderdif
ferentdensityconditions.Inthisstudy,transportphenomenaoffluoresceinandsodiumchlorideinthesolutionwith
differentmixingratiosareobserved,andconcentrationdistributions,dilutionindexandconcentrationstandardde
viationbetweentwosolutesarequantifiedattheoutlet.Theresultsshowthatinconstantdensityfluidstwocom
poundsaretransportedindependently,andtheconcentrationdistributionsaredeterminedbythecompound - specific
diffusivitiesand dispersivities.In contrast , in variabledensityfluids, twosolutesinteracteach other.The
transporttrajectoryandtheconcentrationdistributionsareidenticalbetweenthetwosolutesandtheyaredependent
onthesolutewithlargerproportioninthemixture.Comparedtotheconstantdensitycondition,variabledensity
convectionleadstoalargercontactareabetweenthesoluteplumeandthesurroundingfluids ,thusremarkablyen
hancingsolutedilution.
Keywords:variabledensityfluid;constantdensityfluid;dual - components;solutetransport;laboratoryexperiment
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