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ID:34857685
大小:2.68 MB
页数:61页
时间:2019-03-12
《flow and heat transfer characteristics in high porosity metal foams论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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:YingzhengLIUDissertationSubmittedtoShanghaiJiaoTongUniversityfortheDegreeofMasterFlowandHeatTransferCharacteristicsinHighPorosityMet
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
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