ASTM E457-2008 用热容量(芯棒)热量计测量传热速率的标准试验方法
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【英文标准名称】:StandardTestMethodforMeasuringHeat-TransferRateUsingaThermalCapacitance(Slug)Calorimeter
【原文标准名称】:用热容量(芯棒)热量计测量传热速率的标准试验方法
【标准号】:ASTME457-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:calorimeter;heattransferrate;slugcalorimeter;thermalcapacitance;Calorimeter--aerospaceapplications;Heatingtests--aerospacematerials;Heattransfer;Slugcalorimeter;Thermalcapacitance
【摘要】:Thepurposeofthistestmethodistomeasuretherateofthermalenergyperunitareatransferredintoaknownpieceofmaterial(slug)forpurposesofcalibratingthethermalenvironmentintowhichtestspecimensareplacedforevaluation.Thecalorimeterandholdersizeandshapeshouldbeidenticaltothatofthetestspecimen.Inthismanner,themeasuredheattransferratetothecalorimetercanberelatedtothatexperiencedbythetestspecimen.Theslugcalorimeterisoneofmanycalorimeterconceptsusedtomeasureheattransferrate.Thistypeofcalorimeterissimpletofabricate,inexpensive,andreadilyinstalledsinceitisnotwater-cooled.Theprimarydisadvantagesareitsshortlifetimeandrelativelylongcool-downtimeafterexposuretothethermalenvironment.Inmeasuringtheheattransferratetothecalorimeter,accuratemeasurementoftherateofriseinback-facetemperatureisimperative.Intheevaluationofhigh-temperaturematerials,slugcalorimetersareusedtomeasuretheheattransferrateonvariouspartsoftheinstrumentedmodels,sinceheattransferrateisoneoftheimportantparametersinevaluatingtheperformanceofablativematerials.Regardlessofthesourceofthermalenergytothecalorimeter(radiative,convective,oracombinationthereof)themeasurementisaveragedoverthecalorimetersurface.Ifasignificantpercentageofthetotalthermalenergyisradiative,considerationshouldbegiventotheemissivityoftheslugsurface.Ifnon-uniformitiesexistintheinputenergy,theheattransferratecalorimeterwouldtendtoaveragethesevariations;therefore,thesizeofthesensingelement(thatis,theslug)shouldbelimitedtosmalldiametersinordertomeasurelocalheattransferratevalues.Wherelargeablativesamplesaretobetested,itisrecommendedthatanumberofcalorimetersbeincorporatedinthebodyofthetestspecimensuchthataheattransferratedistributionacrosstheheatedsurfacecanbedetermined.Inthismanner,morerepresentativeheattransferratevaluescanbedefinedforthetestspecimenandthusenablemoremeaningfulinterpretationofthetest.Theslugselectionmaybedeterminedusingthenomogramasaguide(seeAppendixX1).1.1Thistestmethoddescribesthemeasurementofheattransferrateusingathermalcapacitance-typecalorimeterwhichassumesone-dimensionalheatconductionintoacylindricalpieceofmaterial(slug)withknownphysicalproperties.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.Note18212;ForinformationseeTestMethodsE285,E422,E458,E459,andE511.
【中国标准分类号】:A54
【国际标准分类号】:17_200_10
【页数】:7P.;A4
【正文语种】:英语
【原文标准名称】:用热容量(芯棒)热量计测量传热速率的标准试验方法
【标准号】:ASTME457-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:calorimeter;heattransferrate;slugcalorimeter;thermalcapacitance;Calorimeter--aerospaceapplications;Heatingtests--aerospacematerials;Heattransfer;Slugcalorimeter;Thermalcapacitance
【摘要】:Thepurposeofthistestmethodistomeasuretherateofthermalenergyperunitareatransferredintoaknownpieceofmaterial(slug)forpurposesofcalibratingthethermalenvironmentintowhichtestspecimensareplacedforevaluation.Thecalorimeterandholdersizeandshapeshouldbeidenticaltothatofthetestspecimen.Inthismanner,themeasuredheattransferratetothecalorimetercanberelatedtothatexperiencedbythetestspecimen.Theslugcalorimeterisoneofmanycalorimeterconceptsusedtomeasureheattransferrate.Thistypeofcalorimeterissimpletofabricate,inexpensive,andreadilyinstalledsinceitisnotwater-cooled.Theprimarydisadvantagesareitsshortlifetimeandrelativelylongcool-downtimeafterexposuretothethermalenvironment.Inmeasuringtheheattransferratetothecalorimeter,accuratemeasurementoftherateofriseinback-facetemperatureisimperative.Intheevaluationofhigh-temperaturematerials,slugcalorimetersareusedtomeasuretheheattransferrateonvariouspartsoftheinstrumentedmodels,sinceheattransferrateisoneoftheimportantparametersinevaluatingtheperformanceofablativematerials.Regardlessofthesourceofthermalenergytothecalorimeter(radiative,convective,oracombinationthereof)themeasurementisaveragedoverthecalorimetersurface.Ifasignificantpercentageofthetotalthermalenergyisradiative,considerationshouldbegiventotheemissivityoftheslugsurface.Ifnon-uniformitiesexistintheinputenergy,theheattransferratecalorimeterwouldtendtoaveragethesevariations;therefore,thesizeofthesensingelement(thatis,theslug)shouldbelimitedtosmalldiametersinordertomeasurelocalheattransferratevalues.Wherelargeablativesamplesaretobetested,itisrecommendedthatanumberofcalorimetersbeincorporatedinthebodyofthetestspecimensuchthataheattransferratedistributionacrosstheheatedsurfacecanbedetermined.Inthismanner,morerepresentativeheattransferratevaluescanbedefinedforthetestspecimenandthusenablemoremeaningfulinterpretationofthetest.Theslugselectionmaybedeterminedusingthenomogramasaguide(seeAppendixX1).1.1Thistestmethoddescribesthemeasurementofheattransferrateusingathermalcapacitance-typecalorimeterwhichassumesone-dimensionalheatconductionintoacylindricalpieceofmaterial(slug)withknownphysicalproperties.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.Note18212;ForinformationseeTestMethodsE285,E422,E458,E459,andE511.
【中国标准分类号】:A54
【国际标准分类号】:17_200_10
【页数】:7P.;A4
【正文语种】:英语
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