【英文标准名称】:StandardTestMethodforMeasuringHeatFluxUsingSurface-MountedOne-DimensionalFlatGages
【原文标准名称】:使用安装于表面的单维扁平式量表测量热通量的标准试验办法
【标准号】:ASTME2684-2009
【标准状态】:现行
【国别】:
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:heat-fluxgage;temperaturegradient;thermaltransport
【摘要】:Thistestmethodwillprovideguidanceforthemeasurementofthenetheatfluxtoorfromasurfacelocation.Todeterminetheradiantenergycomponenttheemissivityorabsorptivityofthegagesurfacecoatingisrequiredandshouldbematchedwiththesurroundingsurface.Thepotentialphysicalandthermaldisruptionsofthesurfaceduetothepresenceofthegageshouldbeminimizedandcharacterized.Forthecaseofconvectionandlowsourcetemperatureradiationtoorfromthesurfaceitisimportanttoconsiderhowthepresenceofthegagealtersthesurfaceheatflux.Thedesiredquantityisusuallytheheatfluxatthesurfacelocationwithoutthepresenceofthegage.Temperaturelimitationsaredeterminedbythegagematerialpropertiesandthemethodofapplicationtothesurface.Therangeofheatfluxthatcanbemeasuredandthetimeresponsearelimitedbythegagedesignandconstructiondetails.Measurementsfrom10W/m2toabove100kW/m2areeasilyobtainedwithcurrentsensors.Timeconstantsaslowas10msarepossible,whilethickersensorsmayhaveresponsetimesgreaterthan1s.Itisimportanttochoosethesensorstyleandcharacteristicstomatchtherangeandtimeresponseoftherequiredapplication.Themeasuredheatfluxisbasedonone-dimensionalanalysiswithauniformheatfluxoverthesurfaceofthegagesurface.Becauseofthethermaldisruptioncausedbytheplacementofthegageonthesurface,thismaynotbetrue.Wesley(3)andBabaetal.(4)haveanalyzedtheeffectofthegageonthethermalfieldandheattransferwithinthesurfacesubstrateanddeterminedthattheone-dimensionalassumptionisvalidwhen:where:ks
【中国标准分类号】:
【国际标准分类号】:17_200_10
【页数】:7P.;A4
【正文语种】: