Heattransfertosupercriticalfluidsflowinginchannels—empiricalcorrelations(survey)OriginalResearchArticle

Thisliteraturesurveyisdevotedtotheproblemofheattransferoffluidsatsupercriticalpressuresincludingnearcriticalregion. Theobjectivesaretoassesstheworkthatwasdoneintheareaofheattransferatsupercriticalpressures,tounderstandthespecificsofheattransferattheseconditions,tocomparedifferentpredictionmethodsforsupercriticalheattransferintubesandbundles,andtochoosethemostreliableones. Thecomparisonsshowedthereisasignificantdifferenceinheattransfercoefficientvaluescalculatedaccordingtovariouscorrelations.Onlysomecorrelationsshowsimilarresults,whicharequiteclosetotheexperimentaldatafornormalsupercriticalheattransferinwaterandcarbondioxide.Also,noonecorrelationcanaccuratelypredictthemagnitudeandonsetofdeterioratedheattransfer. Theexhaustiveliteraturesearch,whichincludedhundredsofpapers,showedthatthemajorityofcorrelationswereobtainedintubesandjustfewoftheminotherflowgeometriesincludingbundles. Thevariationsinthepredictionofsupercriticalheattransferarerelatedtothesignificantchangesinthermophysicalpropertiesnearthecriticalandpseudocriticalpoints.Therefore,adiscussiononthegeneraltrendsofvariousthermophysicalpropertiesatnearcriticalandpseudocriticalpointsisalsoincluded. Basedonseveralchosencorrelations,theheattransfercoefficientsandtemperatureprofilesintheCANDU-Xreactorcooledwithsupercriticalwaterwerecalculated.