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1、英文原文：Coaloxidationatlowtemperatures:oxygenconsumption,oxidationproducts,reactionmechanismandkineticmodellingTheconservationofmasandenergywillbeappliedtotheregionsdepictedinFigures2a-2c.Theseconsistofthe(a)thechar,@)thevaporizationinterface,and(c)thevirginsolid.
2、Formassconservationwithrespecttoacontrolvolume,therateofchangeofmasswithinthecontrolvolumeplusthenetrateofmassflowoutofthecontolvolumeisequaltozero.Theconservationofenergyforacontrolvolumestatesthattherateofchangeofinternalenergywithinthecontolvolumeplusthenetr
3、ateofenthalpyoutisequaltothenetrateofheataddition.Workisneglected,exceptforflowwork,andcombustionenergycanbetreatedasaneffectiveheataddition.Constantpropertieswillbeassumedforeachdistinctmedia,i.e.charandvirginmaterial;andtheinternalenergyisreferencedattheiniti
4、altemperature.TheconservationofmasforthesolidinFigure1isgivenby(1)whereisthemassofchangeofthesolid,Aisthesurfacearea,Andisthemasflowrateofthegasifiedproductsperunitarea.Hence,isthemaslossrateperunitsurfacearea,orwhichismorecommomlyreferredtoastheburningrate(per
5、unitarea).Eq.(1)isnotessentialtothegoverningequationswhichfollow,butisonlypresentedtoshowtherelationshipbetweentherateoffuelgasseswhichflowoutofthesystemandtherateofmawlossofthesolid.ConservationofmassforthecharByconsideringtheconservationofmassforthecharlayeri
6、nFigure2a,andassumingthatthevaporizedfuelinstantaneouslyleavesthesolid,itfollowsthat(2)wherepcisthechardensity,andxh,"isthecharmassflowrateperunitareafromthevaporizationplane.Theaccumulationofthefuelgasesinthecharmatrixistakentobenegligible,sothattherateofgaseo
7、usfuelenteringfromthevaporizationinterfaceisequaltotherateoffuelgaseswhichleavethesolidtobeburned.ConservationofmassforthevireinsolidConsequently,aconservationofmassonthevirginfuelelementinFigure2cyields(3a)Wherepisthedensityofthevirginsolid,andwherethecontrolv
8、olumesurfacemovesatthespeedofthevaporizationplane,v=.Itisassumedthatthethicknessofthesolidstaysconstantasdecompositionoccurs.Conservationofmassforthevaporizationinterface.Am
