Development and evaluation of enhanced heat transfer tubes

《Development and evaluation of enhanced heat transfer tubes》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、AppliedThermalEngineeringxxx(2011)1e5ContentslistsavailableatScienceDirectAppliedThermalEngineeringjournalhomepage:www.elsevier.com/locate/apthermengDevelopmentandevaluationofenhancedheattransfertubesa,*bbDavidJ.Kukulka,RickSmith,KevinG.FulleraStateUniv

2、ersityofNewYorkCollegeatBuffalo,1300ElmwoodAvenue,Buffalo,NY14222,USAbVipertexÔ,658OhioStreet,Buffalo,NY14203,USAarticleinfoabstractArticlehistory:HeattransferenhancementhasbecomepopularrecentlyinthedevelopmentofhighperformanceReceived14November2010ther

3、malsystems.Enhancedsurfacesaretypicallyutilizedtoincreaseheattransfer.ThisstudyevaluatedAccepted15January2011theoverallthermalperformanceofVipertubeÔEHT,aseriesofenhancedtubesproducedbyVipertexÔ.AvailableonlinexxxEnhancementheattransferratiosgreaterthan

4、1werefoundforthefourenhancedtubesthatwereevaluatedforsinglephaseflowintherangeofReynoldsNumbersnear2900.Keywords:Vipertubesenhanceheattransferthroughacombinationoffactorsthatinclude:increasingfluidEnhancedheattransfersurfacesturbulence,generatingsecondary

5、fluidflowpatterns,disturbingtheboundarylayerandincreasingtheEnhancedtubesheattransfersurfacearea.Additionally,theVipertexsurfacedesignalsominimizestheeffectsoffouling.HeatexchangerdesignBoilertubeAllthesefactorsleadtoanincreaseintheoverallheattransfercoef

6、ficientforbothnewdesignsandEnhancedalloytubessystemsthathaveoperatedovertime.ThreedimensionalheattransfersurfacesSeveralenhancedtubeconfigurationswerestudiedhereusingheattransferandfoulingmeasure-EnhancedASTMA249tubesments.Whencomparedtosmoothtubes,thepat

7、entedVipertubesincreasetheoverallheattransferbymorethan100%andminimizedtherateoffouling.SeveralversionsofVipertexenhancedalloytubesareproducedunderASTMstandards,therebyprovidingaveryimportantadvancementinheattransferdesign.Ó2011ElsevierLtd.Allrightsrese

8、rved.1.IntroductiontubeperformancebyGeeandWebb[5];internalenhancementsandroughnesseffectsbyZhouandYao[6],Wangetal.[7],LiuandAwidevarietyofindustrialprocessesinvolvethetransferofJensen[8]andRabasandMitchell[9];corrugatedtubesbyMar