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MEASlJREl¥1ENTOFA3心 (GASANDLIQUID)FLOWSTRUCTURES GENERATEDB YA SPREADINGFLAMEOVERN圃 BUTANOL
GhassanTashtoush，KozoSaito，ClifordCremers Universi句rofKentucky DepartmentofMechanicalEnginering Lexington，K Y40506-0108，USA
TadashiKonishiandAkihikoIto OitaUniversity DepartmentofProductionSystemsEnginering Oita870-1，Japan
ABSTRACT
Thispaperdiscusesnew3-Dexperimentaldatathatwereobtainedbyalaser回 shet-particle- tracking(LSPT)techniqueforaspreaclingf1ameovern-butano.lThem句orheat-transferproces betwenthef1ame'sleadingedgeand仕leliquidisahi出ly仕ansientphenomenoninvolvingboth liquidandgasphases. Theseinteractwitheachotherthroughexchangesofmomentum，heat， and mas s. W e improved our original 2-D LSPT and made it ap plicable to study 3-D measurement.Usingthisnew3-DLSPTwemeasuredaseriesofvelocityprofilesinapulsating E紅nespreadover任 butanolatdiferentdistancesaboveorbelowtheliquidsurfaceandobtained 3-Df10wvisualizationinbothliquidandgasphases. ThenewLSPTcon五rmedtheexistenceof twinvortexf10wontheliquidsurfaceanddepintheliquidseveralm mbelowthesurface. Thesevorticesgradualydisapearasthelasershetmovesdown企omtheliqu.idsurface. A similartwin-vortexstructure也 thegasphasewasalsoobservedfor也e五rsttime. Theseresu1ts haveproventhat也econvectivef10winbothliquidandgasphasesis3-DinnatureinPyrex narowtrayswiththrediferentwidth.
KEYWORDS:Fl釦 lespreadoverliquids，Pulsating，Laser-shet-particle仕acking. INTRODUCTION
Thisisacontinuationofourpreviousworkonf1amespreadoverliquids[1-2].Inthispapぽ， we focuson也e3-Dmeasurementtechniqueandrecentnewlyobtainedrepresentativedata. Flame spread over liquids is of our cur rent interest because of 吐le fundamental curiosity .of its
