analysis of uniform semi-porous heat sink medias …分析semi-porous均匀散热媒体…

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1、ANANALYSISOFPOROUSMEDIAHEATSINKSFORNATURALCONVECTIONCOOLEDMICROELECTRONICSYSTEMS.byEricR.SaveryEngineeringProjectsubmittedinpartialfulfillmentoftherequirementsforthedegreeofMasterofEngineeringInMechanicalEngineeringApprovedbyErnestoGutierrez-Miravete

2、,EngineeringProjectAdvisorRensselaerPolytechnicInstituteHartford,ConnecticutDecember,2011viiTableofContents:ListofTablesiiiListofFiguresivNomenclaturevAcknowledgementviAbstractvii1.Introduction13.Methodology/Approach53.1.Assumptions53.2.Theory63.3.Fi

3、niteElementModeling104.ResultsandDiscussion145.Conclusion266.Appendix1277.Appendix2288.Appendix3299.Appendix43010.Reference31viiListofTablesTable1:PorousHeatSinkCharacteristics10Table2:BlockForm11Table3:ControlBlockHeatSinkResults14Table4:PorousHeatS

4、inkResults17Table5:NumberofElementforElementPre-set25viiListofFiguresFigure1:FinHeatSink1Figure2:SchematicRepresentationofMicroelectronicHeatSink2Figure3:NoHeatSink3Figure4:SolidBlockHeatSink3Figure5:PorousHeatSink4Figure6:SchematicRepresentationofsy

5、stem5Figure7:Temperaturevs.Density7Figure8:DifferentPorosity,SamePermeability8Figure9:SamePorosity,DifferentPermeability8Figure10:NoHeatSinkMesh12Figure11:SolidBlockMesh12Figure12:PorousBlockMesh13Figure13:NoHeatSinkT-V(IsothermsandVelocityVectors15F

6、igure14:SolidHeatSinkT-V(IsothermsandVelocityVectors)15Figure15:PorousHeatSinkIsothermsandVelocityField16Figure16:PorousHeatSinkStreamlinesandVelocityMagnitude17Figure17:EffectofPorosityEffectonHeatRemoval19Figure18:PermeabilityEffectonHeatTransfer20

7、Figure19:PermeabilityEffectonVolumetricFlowRate21Figure20:EffectofPermeabilityonTotalHeatFlux22Figure21:EffectofPermeabilityonVolumeFlowRate22Figure22:EffectofMeshonTotalFlux24Figure23:EffectofMeshonVolumeFlowRate24viiNomenclatureSymbolsCp=J/kgK=Heat

8、CapacityatConstantPressureK=m^2=Permeabilityρ=g/m^3=Densityε=-=Porosityϕ=W/m^2=HeatFluxP=N/m^2=PressureT=K=Temperaturek=W/(m*K)=ThermalConductivityu=m/s=FluidVelocityg=m/s^2=Gravityt=sec=Timev=m/s=VelocityFieldμ=N*s/m^2=FluidViscositySubscriptsAir=Ai