碳纤维类毛细材料在低温下的传热特性研究

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1、兰州理工大学硕士学位论文碳纤维类毛细材料在低温下的传热特性研究姓名：李慧燕申请学位级别：硕士专业：化工过程机械指导教师：陈叔平20080518碳纤维类毛细材料在低温下的传热特性研究ABSTRACTProblemsinvolvingmultiphaseflow，multicomponenttransportandheattransferinporousmediaariseinanumberofscientificandengineeringdisciplines．Thoseimportanttech

2、nologicalareasincludeaero-space，oilreserVoirengineering，groundwatercontaminationandremediation，heatpipetechn0109ies，dryingprocesses，particulatemateriaIsprocessing，tricklebedreactors，geothermalreserVoirsandsoon．Basedonthetheoriesoffluidmechanics，massan

3、dheattransferinporousmedia，gas-liquidtwo_phaseflow，computationalfluiddynamics，theexperimentresearchandthenunflericalsil】[1ulation，thisthesisresearchedtheheattransfercharacteristicsofcapillaryporousmediainhypothermia．Firstly，analysiswascarriedoutofthet

4、ransferprocessesincapillaryporousmedia．Theemphasiswasplacedonthedeductionofcontinuousequation，momentumconserVationandenergyconserVation．Andthreemodelsofthetwo—phaseflowinporousmediawerepresented：SFMseparateflowmodel，two·phasemixturemodelandthenewthree

5、—zonemodel．Secondly，astudyonheattransfercharacteristicofporousmaterialunderthelowtemperaturewasintroduced．TheexperimentalresulttestifiedthatthelowtemperaturemaintainingtimeincreasesobViouslyafterfillingintheporousmaterialwhichchangestheheattransfercha

6、racteristic．Itisfbundthatthereisaconsanguineousrelationbetweenheattransfercharacteristicandmaterialdensity．Withthedecreaseofporousmaterial’sdensity，theheattransfercharacteristicisenhancedcontinuously．Andalsofoundthattheliquidnitrogenconsumptionincreas

7、edafterfillingintheporousmaterial．Thirdly，F1uentisusedtosimulatethetemperaturefieldsofthetransferprocessesincapilIaryporousmedia．Itcanbedrawnthatthewalltemperatureisminimumatthesametimewhentheporosityis0．85．Andthoughcontrastingtheexperimentalresultswi

8、thsimulationcalculationitcanbeconcludedthatthemaininfluencingfactorsaretheheatleakageofexperimentalapparatus，heatfluxfromenvironmentanderrorofⅡtemperatureinstrument．硕士学位论文Keywords：PorousMaterial；HeatTransferCharacteristic；Gas—liquidTwo—phase；M