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1、RheolActa36:56-65(1997)©SteinkopffVerlag1997ErikA.ToormanModellingthethixotropicbehaviourofdensecohesivesedimentsuspensionsAbstractAdensecohesivesedi-oftherateequation.Theapplicabil-Received:22May1996Accepted:9October1996mentsuspension,whichcontainsityofthemodelisdemonstrated
2、byprimarilyclayparticles,isathixo-examplesofthepredictionofcon-tropicnon-idealBinghamfluidwithstantstructurecurvesandoftransi-atrueyieldstress.Itstime-depen-entbehaviour.ThethixotropymodeldentrheologicalbehaviourcanbeisincorporatedintoaNavier-StokesDr.E.A.Toorman(~)describedb
3、ythestructuralkineticssolvertostimulatetheflowbehav-HydraulicsLaboratorytheoryinwhichtheyieldstressisiourinaCouetteviscometer.CivilEngineeringDepartmenttakenasameasureforthestructuralKatholiekeUniversiteitLeuvenparameter.ThistheoryallowstheKeywordsThixotropy-structuralDeCroyl
4、aan23001Heverlee,Belgiumconstructionofamoregeneralequa-kineticstheory-cohesivesedimenterik.toorman@bwk.kuleuven.ac.betionofstate,whichisindependentsuspension-numericalmodellingNotationIntroductionaAggregationorrecoveryrateparameterThestudyoftherheologicalbehaviourofcohesivese
5、-bBreak-downrateparameterdimentsuspensions,suchasclaysuspensions,isofc=po-Ctoepracticalimportanceinhydraulicengineering(dredging,kGeneralrateparameterhyperconcentratedflow,erosionresistance;e.g.Enge-rRadialcoordinatelundandWan,1984,andGularteetal.,1979),miningtTimeengineering
6、(drillingmuds;e.g.NguyenandBoger,fiBreak-downtorecoveryrateratio=b/a1985),civilengineering(cementandgrouts;e.g.Lapa-Shearratesinetal.,1983)andchemicalengineering(ceramicma-t/o~Dynamicviscosityforfullybrokenstructureterials;e.g.Moore,1959).Sincetheearly1980sexten-2Structuralpa
7、rameter='cy/'Cosivestudieshavebeencarriedoutontherheologicalbe-/~0Initialdifferentialviscosityhaviourofestuarinecohesivesedimentsuspensions.Im-~o~BinghamviscosityportantreviewshavebeenpresentedbyWilliams"cShearstress(1984),VerreetandBerlamont(1989)andWilliamsand%Initialyields
8、tress(fullyrecoveredstructure)Williams(1989a,1989b).Thisworkismissin
