Title of article
HeattransportandvoidfractioningranulateddebrisOriginalResearchArticle
Author/Authors
AndreasZeisberger، نويسنده , , FranzMayinger، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
7
From page
2117
To page
2123
Abstract
Thepaperdiscussestheboilingheattransferfromaporousbedwithinternalheatsourcesandreferstotheconfigurationinanuclearreactorafterapartialcoremelt.Theflowofcoolant,thetemperatureandthelocalliquid/vapordistributionwereinvestigatedinatwo-dimensionalconfiguration.Experimentswereconductedusingmonodispersebedsaswellasamixtureoftwodifferentparticlesizeswithatotalporositybelow20%.Insometeststhebedwassupportedbyashellofporousmaterialtocreateagapalongthebottomofthetestcontainer.Waterwasusedfortestsupto9%ofthecriticalpressure,whileothertestsweremadewithR134aupto44%ofthecriticalpressure.Themaximumheatingraterealizedinductivelywas730kW/m2.Theexperimentshavebeencomparedtoanalyticalresultswithaone-dimensionalapproach.
Itisshownthatincontrarytothesituationinsmallcylindricalconfigurationstheheattransferwasincreasedbylargebuoyancydrivenconvectiveflows.Iftherewasagapalongthecontainerbottomanadditionalflowofliquidimprovedthecoolabilityofthebottomregioneveniftheupperpartoftheparticlebedwasalreadyoverheated.Incaseofhighdensityratios(wateratlowpressure),themeasurementsindicatedastrongenhancementofthecoolantflowaboveacertainminimumheatingrateresultingindecreasingvaporfractionvalueswhichwerenearlyindependentofthesystempressure.Thiswasassumedtobecausedbytheappearanceofverticalchannelsthroughwhichthevaporcouldflowthroughtheparticlebed.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
941326
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