稠密颗粒两相流的理论与数值模拟

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1、中山大学博士学位论文稠密颗粒两相流的理论与数值模拟姓名：吴春亮申请学位级别：博士专业：工程力学指导教师：詹杰民20041030豹过程。(5)对于气液硒相流的数值计算。计及附加质量力的影响是数值稳怒的必簧条件，两相的升力作用则对模拟气泡特性影响较大。在较大的气体表观速度下，皴漶塔凑滚俸其鸯一令憨钵熬环流，露程较奎鹃袭鼹遽壤下，气泡运动楚弱态，伴随有周期性的垮曲，塔内液体的环流则较复杂，存在二次涡现象。数馕诗算豹镶象表明，本文提出的撩教颗粒模型能够正确地反瘟稠销颗粒耐相流的流态帮动力特髋，论文摄出菲结构两格下翡数篷箨法吴鸯嵩

2、效、扩震性强的特点，由于对连续相街程组采用非结构网格瀚有限体积离散以及对颗粒相采用一些复杂算法，熬努蛙鹅决了在苓援鬟

3、j嚣域下邀行嚣糖流数值诗算存在靛疆鼹。关键词：稠密颗粒磁相流，Euler双流体模型，离散颗粒横挺，非结构网格l

4、lAbstractMuitiphaseflowsexistwidelyinthenaturalenvironment(such撼cloudsandfogs．typhoons,sandstormsandvolcanicactivity)aswellasindustrialfields(suchas

5、fluidizcdbeds,pneumatictransportsandbubblecolun-mreactors)。强owideapplicationsofmultiphasesystemsrequireanalyzingandpredictingtheflowbehaviors。Herethenumericalsimulsdonis箍powerfultooltosolvethemuitiphaseflowproblems．Thesynthesisandcommentofthecurrentknowledgeonmui

6、tiphaseflowsaregivenandmathematicalmodelsa寒谢镞l赫thebasicconceptsofdellseparticulateflowsareintroducedinthisthesis．Accordingtotheparticlemodelingapproach，themathematiealmodelsarebasicallydistinguishedasEuleriantwo-fluidmodelanddiscreteparticlemodel，Bothhavetheiradv

7、antages蕊application。Forthecases，whichconcernonlythebehaviorsofsomeinterfacesorcirculationstructuretheEuleriantwo-fluidmodelmaybeconsideredfirstanditneo畦§lesscomputmiontime。SedimentationofparticlesininclinedandverticalvesselsishumerieallysimulmedwheretheEuleriantW

8、o·fluidmodelisapplied．Theparticlephaseisregarded鹕acontinuumaswellasthefluidphasewhiletheviscosityandsolids轾essofparticulatephasearcmodeledbythekinetictheoryofgranularflows．豇把conservationequationsalediscretizedbythefinitevolumemethod。Th#numeticalresultsshowallinte

9、restingphenomenonwithtwocirculationvortexesofthesedimentationflowin叠verticalvesselbutoneintheinclinedvessel．Sensitivitytestsarecarriedouttounderstandthefactorsthatinfluencethedual-vortexflowstructureinverticalsedimentation．Resultsshowthat镪#largerfluidviscositymak

10、esthetwovortexcentersmuchclosertoea曲otherandthoboundarylayereffectatlateralwaltsisthekeytoinduccthisphenomenon。Inthefluidboundarylayerparticlessedimentmurerapi