资源描述:
《Radiative heat transfer calculation section(辐射换热计算部分)》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、Radiativeheattransfercalculationsection(辐射换热计算部分)Thispaperconsistsof314243530contributionsDOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.RadiativeheattransfercalculationsectionAbasicconcept
2、,mainlyincludes:thedefinitionandpropertiesofanglecoefficient;diffusegraysurfaceradiationheattransfercharacteristics;fromtheprincipleandapplicationofhotplate;gasradiationandsolarradiationcharacteristics.1,theradiationheatsealedcavitynetworkmethod.A:solvingtheradiative
3、transferproblemofthermalandelectricalOhm'slawincomparableanddrawaclosedcavitynetworkmethod.Aformulaforcalculatingtheradiativeheattransferbetweentwoarbitraryblackbodysurfacesispresented:,Informula(Eb1-Eb2),equaltopotentialdifference,Equivalenttoresistance,calledspacet
4、hermalresistance;Thenetradiationheattransferformulaofasurfacebetweentheashesisalsoderived:,Informula(Eb1-Eb2),equaltopotentialdifference,Equivalentresistance,calledsurfacethermalresistanceThespecificstepsareasfollows:firstofallthesurfacemustformaclosedsystem,andthend
5、rawtheresistancenetworkdiagram,thespecificmethodsare:1eachsurfacewith1nodes(thesurfaceshouldhavethecharacteristicsoftemperatureandsurfaceradiation,thesameabsorption)thermalpotentialforeffectiveradiationJi;thesurfaceofeachofthetwoconnectionaspacecorrespondingtothether
6、malresistance;eachsurfaceandgroundconnectionbetweenasurfaceresistanceandthe"battery"(blackbodyradiationforceEb);ifananglecoefficientis0,thespaceresistanceapproachesinfinity,thecorrespondingbetweenthetwosurfacescanbedisconnected,thespaceisnotconnectedifasurfaceinsulat
7、ionresistance;itishot,floatingpotential,andthegroundconnected.2,comparedwiththesurfaceblackbodyradiationsurfaceareJ=Eb.heavy,doesthismeanthattheblackbodysurfaceandheavyradiationmaskhavethesameproperties?Answer:Althoughthecharacteristicsofblackbodysurfaceandheavyradia
8、tionsurfaceareJ=Eb,butthetwohavedifferentThetemperatureoftheblackbodysurfacedoesnotdependonthesurfaceoftheotherparticipatingradiati