融冰過程取冷特性數(shù)值模擬及分析.pdf

1、大連理工大學碩士學位論文融冰過程取冷特性數(shù)值模擬及分析姓名：李永輝申請學位級別：碩士專業(yè)：制冷與低溫工程指導教師：李維仲20061201融冰過程取冷特性數(shù)值模擬及分析NumericalSimulationofIceMeltingandHeatTransferAbstractWebeginwithintroducingthesolutionanddataprocesstechnologyinCFDAndCFDbasictheoryofnu

2、mericalsimulationaswellasgridgenerationtechnologyagepresentedInordertosolvetheboundaryproblemoficcmeltingthebasictheoryofitisintroducedAndthecoupledcalculatingequationoficemeltingboundaryiSeducedIntermsofenergyequationsi

3、nphasechangeAndthenewboundarypositioniSsolved111eSpaceConservationLawisemployedtoupdatetheJacobiannumberinordertoeliminatetheeffectsofmovingmeshonnumericalstabilityandavoidthefalsemasssourcetermariseswithmovinggridInthis

4、thesis，thegoverningequationsarediscretizedonthecollocated面dsinabodyfiuedcoordinatebyusingfinitevolumemethods皿eQUICKandcentraldifferencingschemesaleusedforthediscretizationsofconvectionaltermanddiffusedtermrespectivelyneS

5、IMPLEalgorithmisemployedtodecouplevdocitiesandpressureGridgenerationisusingmovingmeshtechnologyinabodyfittedcoordinatesEnergyreleasefromicemeltingandinternalmelticeoncoilduringachargingcycleproblemissimulatedsuccessfully

6、throughsolvingfinitevolumemethodintheNSequationsrn壕characteristicsofthemovinginterfacebetweentheiceandwaterareaduringmeltingprocessarestudiedPropagationsofthetemperaturefieldandmeltinginterfaceareobtainednechangesofmelti

7、ngcmvelocalNusseltnumberandmeanNusseltnumbervaryingwithtimearepresentedwithfiguresInadditionthispapershowstheanalysisforenergyreleasepropertyvaryingwiththe衄erentinlettemperatureandvelocityduringthedischargingcycleinthedi

8、fferentwayofheattransferandtherulesofheattransferinicemeltingisgainedTheconclusionshows：fortheenergyreleasefromicemeltingproblem，becauseoftheexistenceoftheinfluanceofnaturalandforcedconvectiononbothmeltingofanicelayerand

9、flowofliquidlayertheinfluenceofthewaytoreleaseenergytotherateoficemeltingandeffectoftheenergyreleaseisobviousAnt／clockwisecirculationinwaterareaisformedafterllightemperaturewaterisinjectedtothewaterareaduetotheinfluenceo

10、fnatl1ralconvectionThefurthertheoutletpositioninthisanticlockwisecirculationisfromtheinletpositionwhichisonthebottomoftherightboundary；thebetteristheeffectoftheenergyreleaseFortheinternalmelticeoncoilduringachargingcycle