flow and heat transfer characteristics in high porosity metal foams论文

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1、上海交通大学学位论文FlowandHeatTransferCharacteristicsinHighPorosityMetalFoams专业名称：MechanicalEngineering作者姓名：DaeYeonKim指导教师：YingzhengLIUDissertationSubmittedtoShanghaiJiaoTongUniversityfortheDegreeofMasterFlowandHeatTransferCharacteristicsinHighPorosityMet

2、alFoamsCandidate：DaeYeonKimStudentID:1130209471Supervisor：Prof.YingzhengLIUAcademicDegreeAppliedfor：MasterofEngineeringSpeciality：MechanicalEngineeringAffiliation：SchoolofMechanicalEngineeringDateofDefense：January,2015Degree-Conferring-Institution：ShanghaiJiaoTongU

3、niversityiiiiiiFlowandHeatTransferCharacteristicinHighPorosityMetalfoamsABSTRACTInthisstudy,flowandheattransfercharacteristicsinhighporositymetalfoamswereexaminedtheoretically,numericallyandexperimentally.Highporositymetalfoamsarepromisingmaterialstobeusedforahighe

4、fficiencyheatexchanger.TheoreticalandNumericalapproachesweredevelopedbasedontheDarcy-BrinkmanequationandForchheimer-Darcyequation,respectivelywithamodifiedenergyequationtopredictvelocityandtemperatureprofilesinarectangularchannelfilledwithmetalfoams.Toexamineeffect

5、ofthicknessofmetalfoamfibre,metalfoamwasassumedWeaire-PhelanstructureandNavier-Stokesequationwasemployedforcomputationalfluiddynamics.TheForchheimer-Darcymodificationwasemployedwiththeexperimentalresultstodetermineflowcharacteristics,thepermeabilityandtheinertialco

6、efficient.Nusseltnumberwasderivedfromavolumetricheattransfercoefficientbasedonthelocalwallandfluidtemperatures.Tovalidatethenumericalprediction,anexperimentalstudywascarriedouttoinvestigateflowandheattransfercharacteristicsinmetalfoams.Forthisstudy,thetestsectionch

7、annelsivwerefilledwithseveralmetalfoamsamples(copperandnickel)withdifferentporeperinch(ppi)andairwasusedasacoolantfluid.Temperaturedistributionandpressuredropalongthetestsectionweremeasuredforarangeofcoolantflowrates.Thevelocityprofilebecomesmoreflatwithincreasingp

8、orosityofmetalforms.Predictedpressuredropandheattransferagreewellwiththoseobtainedfromexperiment.KEYWORDS:metalfoam,porosity,poreperinch,effectof