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1、ExperimentalThermalandFluidScience28(2004)639–653www.elsevier.com/locate/etfsPIVmeasurementoftheflowfieldinrectangularductswith60°parallel,crossedandV-shapedribsXiufangGao,BengtSunden*DivisionofHeatTransfer,LundInstituteofTechnology,OleRomersVag1,Box118,SE-22100L
2、und,SwedenReceived12December2002;receivedinrevisedform23September2003;accepted29October2003AbstractTheflowcharacteristicsinrectangularductswithaspectratioof1:8wereinvestigatedexperimentallyusingparticleimageve-locimetrytorevealthefunctionoftheinclinedribsasturbul
3、atorsorgeneratorsoffavorableflows.Circularribswereattachedonthewidewallsandtheribheight-to-hydraulicdiameterratiowaskeptas0.06withanattackangleof60°.Theobtainedresultsshowedstrongeffectsoftheinclinedribsontheflowbehaviorbythedevelopmentofsecondaryflows.Themagnitudeo
4、fthestreamwisevelocitycomponentwasdetectedtohavespanwisevariation.Theflowcharacteristicswerecorrelatedwiththepreviouscorrespondingheattransferresultsobtainedbythesameauthors.Ó2003ElsevierInc.Allrightsreserved.Keywords:Rib-roughenedduct;Particleimagevelocimetry;He
5、attransferenhancement;Secondaryflow1.IntroductionformanceofCFDcodes,avalidationofthepredictionsisnecessaryanddetailedmeasurementsoftheflowArtificialroughnesselementssuchasperiodicribsinstructureintheflowpassagesarethusrequiredtopro-rectangularductsforheattransferenh
6、ancementarevidedatabasesforcomparison.foundinawiderangeofapplications,e.g.,compactheatMostflowfielddataavailablewereobtainedwithexchangers,turbinecoolingschemes,etc.Thepresencelaserdopplervelocimetry(LDV)orhotwires.Liouetal.ofperiodicribschangestheflowcharacteristi
7、csinthe[7]measuredmeanvelocities,turbulenceintensitiesandductsandinducesdifferentsecondaryflowssoastoReynoldsstressesbyLDVina1:2rectangularductwithenhancetheheattransferprocess.squareperpendicularribsataReynoldsnumberofThusfarmostofthepublicationshaveobtainedheat3
8、3,000.Hirotaetal.[8]examinedthesecondaryflowtransferresults.Experimentaltechniquessuchasliquidpatternscausedbyperpendicularlyarrangedsquareribscrystalthermography[1,2]
