附加相变材料层的热防护服装传热数值模拟

1005-0930201104-0635-009TS101．923Adoi10．3969/j．issn．1005-0930．2011．04．0132009-11-172010-12-2820100476651977—[e-mail]450007．．．PCMPCM．PCMsPhaseChangeMaterials1-2．207080NASA．．—．3．PCM．1“—19420118JOURNALOFBASICSCIENCEANDENGINEERINGVol．19No．4August2011—”2．1．14ρmcpmTt=λm2Tx2+γ·qrade－γx+ρmQZt1ρm、cpmλm、．QZZ=1Z=0．γ1γ·qrade－γx．1ρmQZtPCMZ10．ZZ=12erfcT－TmT()02TmT0±2℃．．．．．t≥0－λmTx=qrad+qcon3qradqcon21kW/m250%42kW/m2．－λmTx=qaircon+qairrad4qairconqairradqaircon=hifTif－Tos5qairrad=σεifεosT4if－T4os6TifTosσStephan-Boltzmannεifεoshif4．636Vol．191．2Pennes’5ρscpsTr=λsT+ρbcpbωbTs－T7ρscpsλs、3ρbcpbλb、ωb0．00125m3/sTs．37℃、34℃—37℃．176．—．21Fig．1Testingapparatusforthermalprotectiveperformance2．117NFPA1971．21kW/m25∶542kW/m2．55．4mm．ASTMF1939ASTMF1930．1．46W/m·K7．3×10－7m2/s．736No．412．8mm37℃．T380℃．2．23、．30℃—80℃．-microPCMsmicroPCMs8．1．1Table1Structuredetailsofeachlayerinthermalprotectiveclothing/mm/g/m2/W/m·K/J/kg·K1Metamax0．640．640．6410152PTFE0．830．830．83115030．620．620．6212500．610．610．611．1×105．TmTm+ΔTm3T＜Tm、T＞Tm+ΔTmTm＜T＜Tm+ΔTm39．3mm2．2Fig．2Schematicdiagramofmaterialcombinations836Vol．1922．1RPP．“+++”1．21kW/m230s76℃．3、0—6s．3Fig．3Comparisonbetweennumericalandexperimentalresultsoftemperatureevolutionofeachlayer、、．102Tr2+1rTr=1αTt82Tx2=1αTt9892Tr2+1rTr=2Tx210101rTr．936No．4．2．2．42kW/m250%30sTm39．6℃、35．8℃32．6℃．415—20s4℃．．4Fig．4RelationbetweenvariationofskinsurfacetemperatureandmelttemperatureofPCM2．333℃33℃100℃．．Henriques11HenriquesArrheniust2t2．21kW/m242kW/m230s32．6℃76℃2．2046Vol．19．21kW/m232．6℃75．6s．76℃32．6℃．40℃40℃．42kW/m276℃44．5s．．．．12．2Table2EffectofconfigurationofPCMlayeronthermalprotectiveperformance/kW/m2214250%50%/℃32．67632．676123——/s47．566．375．660．954．227．936．838．744．541．64．1146No．423．1．、J．19961454-7ZhangXingxiangZhuMingru．Heat-preserveandtemperature-adaptablefiberandfabricsJ．TechnicalTextiles19961454-72．J．2008165671-678LiFengzhiWuChengyunLiYi．NumericalstudyoninfluenceofradiiandamountsofthephasechangemicrocapsulespackedintextilefabriconheatandmoisturetransferinthefabricJ．JournalofBasicScienceandEngineering2008165671-6783．J．200728168-7280LiHuaMaXiaoguangZhangXiaolinetal．CompositeofphasechangematerialsandautomatictemperatureconditioningtextilesmadethereofJ．JournalofTextileResearch200728168-72804ZhuFanglongZhangWeiyuan．Heattransferinacylindersheathedbyflame-resistantfabricsexposedtoconvectiveandradiantheatfluxJ．FireSafetyJournal2008436401-4095PennesHH．AnalysisoftissueandarterialbloodtemperaturesinrestinghumanforearmJ．JApplyPhysiology194893-1226PatankarSV．NumericalheattransferandfluidflowM．Taylor＆Francis19802367．J．20071711134-140ZhuFanglongZhangWeiyuan．StudyonestimationofthermalprotectiveclothingbasedonhumanskinheattransfermodelJ．ChinaSafetyScienceJournal20071711135-1408．J．2002618-19ZhangFuli．MicroencapsulatedtechnologyanditsapplicationinprotectiveclothingJ．ChinaPersonalProtectionEquipment2002618-199．J．2005266825-830ZhangHaifengGeXinshiYeHong．CharacteristicsoftheheatchargeanddischargeoftheencapsulatedphasechangematerialsJ．ActaEnergySolarisSinica2005266825-83010ZhuFanglongMaSuqinZhangWeiyuan．StudyofskinmodelandgeometryeffectsonthermalperformanceofthermalprotectivefabricsJ．HeatandMassTransfer200845199-10511HenriquesFCJr．StudiedofthermalinjuriesV．ThepredictabilityandthesignificanceofthermallyinducedrateprocessesleadingtoirreversibleepidermalinjuryJ．ArchPathol194743489-50212．J．2006347928-932ZhangDongZhouJianminWuKeru．TemperaturemodelofphasechangeprocessofphasechangematerialJ．JournalofTongjiUniversityNaturalScience2006347928-932246Vol．19NumericalSimulationofHeatTransferforThermalProtectiveClothingIncorporatingPhaseChangeMaterialLayerZHUFanglongFashionInstituteZhongyuanUniversityofTechnologyZhengzhou450007ChinaAbstractPhase-changematerialsPCMscanbeusedtoreducethermalstressandimprovethermalcomfortforworkerswearingthermalprotectiveclothingunderfire．InthispaperanumericalmodelisdevelopedwhichinvestigatesheattransferwithinprotectiveclothingsystemcoupledwithPCMlayerwhensuddenlyexposedtoconvectiveandradiantheatfluxfromsimulatedpre-flashoverfireradiation．Thesimulationresultsarevalidatedbytheexperimentalvaluesconductedintheapparatusforevaluatingthermalprotectiveperformanceandthecomputerresultsagreedwellwiththeexperimentalvalues．TherelationsamongprotectiveperformanceandmeltingpointconfigurationofPCMlayerintheprotectiveclothingarealsoinvestigatedbythemodelresults．ItwasfoundthatPCMhaveapositiveeffectonheatprotectioncomparedwiththefireprotectiveclothingcommonlyused．HowevertheefficiencyofprotectionforhumanskinburninjurydependsonthelocationandthethermalpropertiesofPCMlayer．Keywordsthermalprotectiveperformancephasechangematerialskinburnprotectiveclothing346No．4