• Title of article

    Fluctuationcharacteristicsofheatingsurfacetemperaturenearanobstacleintransientboilingtwo-phaseflowinaverticalannularchannelOriginalResearchArticle

  • Author/Authors

    TFukano، نويسنده , , SMori، نويسنده , , TNakagawa، نويسنده ,

  • Issue Information
    روزنامه با شماره پیاپی سال 2003
  • Pages
    14
  • From page
    47
  • To page
    60
  • Abstract
    Whenaflowobstructionsuchasaspacerissetinaboilingtwo-phaseflowwithinanannularchannel,theinnertubeofwhichisusedasaheater,thetemperatureonthesurfaceoftheheatertubeisseverelyaffectedbytheexistenceofthespacer.Insomecasesthespacerhasacoolingeffect,andinothercasesitcausesthedryoutofthecoolingwaterfilmontheheatingsurfaceresultingintheburnoutofthetube.Inthepresentpaperwewilldiscusstemperaturefluctuationsinrelationtothechangeintheflowconfigurationnearthecylindricalspacerintransientboilingtwo-phaseflowcausedbythestepwisechangeoftheoperationparameterssuchastheheatflux,themassflowrate,andtheinletqualityofthetestsection.Asaresultitisconcludedthat:Eveniftheflowpatternchangesrapidlybyastepwisechangeofanoperationparameter,thetransitionofflowproceedssafelyprovidedthatthechangecausestheincreaseofvaporvelocity,i.e.theincreaseoftheshearforcewhichisactingonliquidfilmflow.Ontheotherhandifthechangecausesthedecreaseofthevaporvelocity,itmustbenoticedthatthetransientburnoutpossiblyoccursevenwhentheoperatingconditionafterthechangeislessthanthesteadyburnoutcondition.
  • Journal title
    Nuclear Engineering and Design Eslah
  • Serial Year
    2003
  • Journal title
    Nuclear Engineering and Design Eslah
  • Record number

    894477