中高溫熔點金屬及合金固-液相變點導熱系數(shù)測試新方法研究.pdf

1、中南工業(yè)大學碩士學位論文中高溫熔點金屬及合金固液相變點導熱系數(shù)測試新方法研究姓名：劉健君申請學位級別：碩士專業(yè)：熱能工程指導教師：周子民20000301中南工業(yè)大學碩士學位論：￡／ABSTRACT———————————————————__———————_———_———————————————————————————————ResearchOnaNovelMethodforDeterminationofThermalConductivit

2、yofMetals&EutectieAlloyswithMediumhighMeltingPointduringPhaseTransitionABSTRACTBasedoathethermophysicalpropertymeasurementtechniquesinitialedbyMLamvik，anovelexperimentalmethodisadoptedinthisthesisinthedeterminationofthet

3、hermalconductivtyofmetalsandeutecticalloyswithmedium—hi曲freezing／meltingpointduringthephasetransitionThemethodmakesfulluseofthelatentheatastheheatfluxthatflowsthroughthefreezing／meltingzone，enablesthesolid／liquidinterfac

4、etoactasoneoftheheattransfersurfaces，andthusincorporatestherealisticfeaturesofthephasechangeprocessThemethodalsoemploysanovelnumericaltechniquetocalculatethethermalconductivityofthesampleAttheaidofthetechnique，thefundame

5、ntalequmiongoverningtheheatconductionprocessisconvenedintoafinitedifferentialoneThephasetransitionisconsideredtotakeplaceinalimitedtemperaturerangenearthefreezing／meltingpoint，wherethelatentheatactsasaheatsource(sink)，an

6、disrecognizedasalargespecificheatcapacityComparedthesolid／liquidinterfaceCurvemeasuredintheexperimentwiththeonescalculatedbyemployingthetechniquewithdifferentassumedvaluesforthethermalconductivity，thethermalconductivityo

7、fthesamplecanbedetermJnedZinc，aluminumandseveraleutecticalloysampleshavebeentestedwiththemethod，andreasonableresultshavebeenobtainedascomparedwiththerelativeliteraturevalues，whichprovethemethodisfeasible，andenrichthether