Title of article
BubblerisecharacteristicsafterthedeparturefromanucleationsiteinverticalupflowboilingofsubcooledwaterOriginalResearchArticle
Author/Authors
TomioOkawa، نويسنده , , TatsuhiroIshida، نويسنده , , IsaoKataoka، نويسنده , , MichitsuguMori، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
13
From page
1149
To page
1161
Abstract
Risecharacteristicsofvaporbubblesafterthedeparturefromanucleationsiteinforcedconvectivesubcooledflowboilingwerestudiedvisuallyusingtwosynchronizedhighspeedvideocameras.Thetestsectionwasatransparentglasstubeof20mmininsidediameter,filtratedanddeionizedtapwaterwasusedasaworkingfluid,andtheflowdirectionadoptedwasverticalupward.Theoutersurfaceoftestsectiontubewaselectricallyheatedtogeneratevaporbubblesinsideofthetube.Inthepresentexperiments,themassfluxandliquidsubcoolingwerevariedwithin94–1435kg/m2sand2.2–10K,respectively.Sincetheobservationswereperformedatlowheatfluxestoavoidthesignificantincreaseinthenumberofactivenucleationsites,theobtainedbubbleimageswereclearenoughtocarryoutthedetailedimageanalysisfortherisecharacteristicsofindividualbubbles.Thefollowingthreedifferentbubblerisepathswereobservedafterthedeparturefromnucleationsites:somebubblesslidupwardtheverticalwallforlongdistance,whileotherbubblesweredetachedfromthewallafterslidingforseveralmillimetersandthenmigratedtowardthebulkliquid;afterthemigration,someofthedetachedbubbleswerecollapsedinsubcooledliquidbutothersremainedclosetothewallandwerereattachedtothewall.Theresultsofdetailedimageanalysessuggestedthatthevariationinbubbleshapefromflattenedtomoreroundedwasofprimaryimportancefortheoccurrenceofbubbledetachmentfromthewall.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
894914
Link To Document