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1、AppliedThermalEngineering30(2010)1719e1725ContentslistsavailableatScienceDirectAppliedThermalEngineeringjournalhomepage:www.elsevier.com/locate/apthermengTheexperimentalinvestigationofheattransferandpressuredropinatubewithcoiledwireinsertsplacedseparatelyfromt
2、hetubewalla,*a,1b,2SibelGunes,VeyselOzceyhan,OrhanBuyukalacaaErciyesUniversity,FacultyofEngineering,DepartmentofMechanicalEngineering,Kayseri38039,TurkeybOsmaniyeKorkutAtaUniversity,FacultyofEngineering,DepartmentofEnergySystemsEngineering,Osmaniye80000,Turkey
3、articleinfoabstractArticlehistory:ThepaperpresentstheexperimentalinvestigationofheattransferandpressuredropinatubewithReceived7December2009coiledwireinsertsplacedseparatelyfromthetubewallinturbulentflowregime.TheexperimentswereAccepted1April2010performedwithaco
4、nstantwirethicknessofa¼6mm,threedifferentpitchratios(P/D¼1,P/D¼2andAvailableonline18April2010P/D¼3)andtwodifferentdistances(s¼1mm,s¼2mm)atwhichthecoiledwireinsertswereplacedseparatelyfromthetubewall.UniformheatfluxwasappliedtotheexternalsurfaceofthetubeandKeywo
5、rds:Reynoldsnumbersvariedfrom4105to26400intheexperiments.TheexperimentalresultsobtainedCoiledwireinsertfromasmoothtubewerecomparedwiththosefromthestudiesinliteratureforvalidationofexperi-Heattransfermentalsetup.Theuseofcoiledwireinsertsleadstoaconsiderableincr
6、easeinheattransferandpressurePressuredropOverallenhancementefficiencydropoverthesmoothtube.TheNusseltnumberandfrictionfactorincreasewithdecreasingpitchratio(P/D)anddistance(s)forcoiledwireinserts.Thehighestoverallenhancementefficiencyof50%wasachievedforthecoiled
7、wirewithP/D¼1ands¼1mmatReynoldsnumberof4220.Asaresult,theexperimentalresultsrevealthatusingthesecoiledwireinsertsarethermodynamicallyadvantageousatallReynoldsnumbers.Ó2010ElsevierLtd.Allrightsreserved.1.IntroductionThecoiledwireinsertedintoaflowprovideswirlingfl
8、owandimprovedfluidmixingbetweenthetubecoreandthenearwallManyeffortshavebeenmadeonheattransferenhancementregion,thustheheattransferenhancesbyrapidfluidmixing.accordingtotheprogressoft
