Author/Authors :
D.C.Groeneveld، نويسنده , , J.Q.Shan، نويسنده , , A.Z.Vasi?، نويسنده , , L.K.H.Leung، نويسنده , , A.Durmayaz، نويسنده , , J.Yang، نويسنده , , S.C.Cheng، نويسنده , , A.Tanase، نويسنده ,
Abstract :
CHFlook-uptablesareusedwidelyforthepredictionofthecriticalheatflux(CHF).TheCHFlook-uptableisbasicallyanormalizeddatabankforavertical8mmwater-cooledtube.The2006CHFlook-uptableisbasedonadatabasecontainingmorethan30,000datapointsandprovidesCHFvaluesat24pressures,20massfluxes,and23qualities,coveringthefullrangeofconditionsofpracticalinterest.Inaddition,the2006CHFlook-uptableaddressesseveralconcernswithrespecttopreviousCHFlook-uptablesraisedintheliterature.Themajorimprovementsofthe2006CHFlook-uptableare:
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Anenhancedqualityofthedatabase(improvedscreeningprocedures,removalofclearlyidentifiedoutliersandduplicatedata).
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Anincreasednumberofdatainthedatabase(anadditionof33recentdatasets).
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AsignificantlyimprovedpredictionofCHFinthesubcooledregionandthelimitingqualityregion.
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Anincreasednumberofpressureandmassfluxintervals(thusincreasingtheCHFentriesby20%comparedtothe1995CHFlook-uptable).
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Animprovedsmoothnessofthelook-uptable(thesmoothnesswasquantifiedbyasmoothnessindex).
Adiscussionoftheimpactofthesechangesonthepredictionaccuracyandtablesmoothnessispresented.The2006CHFlook-uptableischaracterizedbyasignificantimprovementinaccuracyandsmoothness.
