Designation:D7896−14StandardTestMethodforThermalConductivity,ThermalDiffusivityandVolumetricHeatCapacityofEngineCoolantsandRelatedFluidsbyTransientHotWireLiquidThermalConductivityMethod1ThisstandardisissuedunderthefixeddesignationD7896;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheuseofatransienthotwireliquidthermalconductivitymethodandassociatedequipment(theSystem)forthedeterminationofthermalconductivity,thermaldiffusivityandvolumetricheatcapacityofaqueousenginecoolants,non-aqueousenginecoolants,andrelatedfluids.TheSystemisintendedforuseinalaboratory.1.2TheSystemdirectlymeasuresthermalconductivityandthermaldiffusivitywithouttherequirementtoinputanyadditionalproperties.Volumetricheatcapacityiscalculatedbydividingthethermalconductivitybythethermaldiffusivityofthesamplemeasured.1.3Thistestmethodcanbeappliedtoanyaqueousornon-aqueousenginecoolantsorrelatedfluidwiththermalconductivityintherangeof0.1to1.0W/m·K.1.4Thistestmethodexcludesfluidsthatreactwithplati-num.1.5Therangeoftemperaturesapplicabletothistestmethodis–20to100°C.1.6Thistestmethodrequiresasampleofapproximately40mL.1.7TheSystemmaybeusedwithoutexternalpressurizationforanyfluidhavingavaporpressureof33.8kPa(4.9psia)orlessatthetesttemperature.1.8Forafluidhavingavaporpressuregreaterthan33.8kPa(4.9psia)atthetesttemperature,externalpressurizationisrequired(seeAnnexA2).1.9ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.9.1Exception—Inch-poundunitsareprovidedin1.7,1.8,4.1,7.8,andA2.1forinformation.1.10Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylim...
