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ID:40557128
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页数:8页
时间:2019-08-04
《a general expression for the correlation of rates of Transfer and Other Phenomena》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、AGeneralExpressionfortheCorrelationofRatesofTransferandOtherPhenomenaTheexpressionY=(1+Zn)l;nwhereYandZareexpressedintermsofthesolutionsforasymptoticallylargeandsmallvaluesoftheindependentvariableisshowntoberemarkablysuccessfulincorrelatingratesoftransferforproc
2、esseswhichvaryuniformlybetweentheselimitingcases.Thearbi-S.W.CHURCHILLtraryexponentncanbeevaluatedsimplyfromplotsofYversusZandY/ZandR.USAGIversus1/Z.Theexpressionisquiteinsensitivetothechoiceofnandtheclosestintegralvaluecanbechosenforsimplicity.Theprocessofcorre
3、la-SchoolofChemicalEngineeringtioncanberepeatedforadditionalvariablesinseries.Illustrativeapplica-UniversityofPennsylvaniaPhiladelphia,Pennsylvania19104tionsarepresentedonlyforflow,conduction,forcedconvection,andfreeconvection,buttheexpressionandprocedureareappl
4、icabletoanyphe-nomenonwhichvariesuniformlybetweenknown,limitingsolutions..Thelimitingsolutionsforlargeandsmallvaluesofthemethodofevaluatingtheconstanthasnotbeenproposed.independentvariables,andparameterssuchastheReyn-Thegeneralapplicabilityoftheequationandthepro
5、-oldsnumber,thePrandtlnumber,andtimeareknownforcedureofcorrelationareillustratedforanumberofproc-manytransferprocessessuchaslaminarandturbulentessesofflowandheattransfer.Theexpressionandpro-flowthroughporousmedia,laminarforcedconvection,cedureappearhowevertobeap
6、plicabletoanyphenom-andthermalconduction.Solutionsforintermediatecasesenonwhichvariesuniformlybetweenknown,limitingaregenerallynotinclosedform.solutions.TheuseofasimpleequationcontainingonearbitraryTheproposedexpressionisusefulforevaluatingasconstantisproposedfo
7、rinterpolationbetweentheselim-wella;summarizingexperimentaldataandvaluesob-itingsolutions.Theconstantcanbeevaluatedfromoneormoreexperimentalortheoreticalvalues.Theequationtainedfromcomputersolutions.Itisconvenientforde-itselfhasbeenusedpreviouslyforcorrelation,b
8、utitssignpurposes,particularlysinceallofthecorrelationsgeneralutilityhasnotbeenrecognizedandasystematichavethesameform.CONCLUSIONSANDSIGNIFICANCETheequationY=(1+Zn)l/
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