Vol.26 No.1 唐复平等：钢包保护套管中弥散微小气泡的生成机理 ·25 参考文献 1091 1 ZhangL,Taniguchi S.Fundamentals of inclusion removal 5 Sevik M,Park S H.The splitting of drops and bubbles by from liquid steel by bubble flotation [J.Int Mater Rev, turbulent fluid flow []J Fluids Eng,1973,March:53 2000,45(2:59 6 Evans GM,Jameson G J,Atkinson B W.Prediction of the 2 Wang L,Lee H,Hayes P.Prediction of the optimum bubble size generated by a plunging liquid jet bubble col- bubble size for inclusion removal from molten steel by umn).Chem Eng Sci,1992,47(13/14)53265 flotation [J].ISIJ Int,1996,36(1):7 7 Clift R,Grace JR,Weber ME.Bubbles,Drops,and Par- ticles [M].New York:Academic Press,1978 3 Wang L,Lee H,Hayes P.A new approach to molten steel refining using fine gas bubbles[J].ISIJ Int,1996,36(1):17 8 WangL,Lee H,Hayes P.Modelling of air ingress and pres- 4 Zhang X,Hayes P,Lee H.Particle removal from liquid sure distribution in ladle shroud system for continuous phase using fine gas bubbles [J].ISIJ Int,1997,37(11): casting of steel [J].Steel Res,1995,66(7):279 Formation Mechanism of Fine Bubbles in the Shroud Nozzle of a Ladle TANG Fuping,LIU Jianhua,BAO Yanping,XU Baomei Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT Highly turbulent flow in the shroud nozzle of a ladle can split introduced inert gas into fine bubbles, which enhances the removal of fine inclusions from molten steel.The maximum size of the bubbles was obtained through calculating the energy dissipation rate of liquid flow in the shroud.The pressure distribution of the fluid flow within shroud was analyzed with Bernoulli equation as well.The results by theoretic calculations are agreeable with these by water modeling experiment. KEY WORDS shroud nozzle;fine bubble;maximum size;pressure distribution、 N6 2 L b o . 唐 复 平等 1 : 钢 包保护 套 管 中弥散微 小气泡 的生 成 机理 . 5 2 . 参 考 文 献 L g h n a Z , 工功i gu e h i 5 . F un d am e nat l s o f inc l u s i o n er m o va l for m il qu id s et e l 妙 b ub bl e fl o t a t lon [月 . ntI M at e r 称V, 2 0 0 0 , 4 5 (2 ) : 5 9 W ia l g L , L e H , H ay e s .P P er di ict o n o f ht e o Pt im um bub b le s诫 fo r inc lus io n er m o v a l for m m o lot n s et e l by if o at t i o n [月 . I S IJ ntI , 19 9 6 , 36 (l ) : 7 W面g L , L e H , H ay e s R A new a PP r o a c h ot m o lt en set e l er ifn ign u s i n g fm e g as b u b bl e s [月 . I SIJ Iin , 19 9 6 , 3 6( 1) : 1 7 hZ an g X , H ay e s P, L e e H . Part i e l e er m o v al for m li q u id hP a s e u s ign fm e g as b u b bl e s [月 . I S IJ Iin , 19 97 , 37 ( 1 1 ) : 1 09 1 5 S e v 水 M , P ar k S H . Th e sP li t i n g o f dr o P s 阴d bub b l e s b y 加r b u l e nt fl ul d if ow 明 . J F l u id s E n g , 1 97 3 , M ar c h : 5 3 6 E v an s G M , J am e s on G J , A t七的s on B W. P r e d ict i o n o f ht e b ub b l e s iez g en r a et d by a Plun g ing li q u id j et bub b l e e o l - u m nL 田 . C he m E n g s e i , 1 9 92 , 4 7 (13 / 14 ) ; 32 6 5 7 C li ft 又 G r a c e J R, W七b e r M E . B ub bl e s , D r o P s , 阴d P ar - t i e l e s 【M」 . N e w OY kr : A c a d e m i e P er s s , 1 97 8 S W如g L , L e e H , H ay e s .P M o d e l l ing o f iar in gr e s s an d P r e s · s uer d i s itr b讯i o n in lad l e s h ro ud s y s t e m fo r e o以 i n u o us e as t ing o f s t e e l [刀 . Set e l 助 s , 19 9 5 , 6 6 ( 7 ) : 2 7 9 F o r 幻n at i o n M e e h an i s m o f F i n e B ub b l e s i n ht e Shr o u d N o z z l e o f a L a d l e AT N G F 匆动9 L I U J 故 hn au, BA 口 为即才呀 刃 U B ao m ie M e at l哩l ic a l an d CE o l o ig e a l Egn ien e ir n g S c b o l , U咖 e r s ity o f s e i e n c e 阴d eT c h n o l o gy B e ij i n g , B e ij i gn l 0 0 0 8 3 , C加匕a A B S T R A C T iH hg ly 仇叮 b u l e in fl o w in het s hr o u d no z l e o f a l ed le e an sP lit i n tr o du e e d in e rt g as iin o if n e b ub b 1 e s , w h i e h e hn a n e e s ht e er m vo al o f if n e in e lus i o n s fr o 幻。 m o let n s t e e l . T h e m ax l幻Quj m s讫e o f ht e b u b b l e s 、 v a s o b at i n e d 加 o u hg e al cul at in g het e n e堪沙 d i s s iP at i o n art e o f liqu i d fl ow in ht e shr o u d . hT e Per s s uer id s t ir b ut ion o f het flu id fl o w iw ht i n s hr o u d w a s an a ly z e d w iht B e m o u lli e q ua t l o n as we ll . hT e er s ult s 妙 ht e oer it c e a l e ul at i o sn aer a gr e e ab l e w it h het se 勿 w a t e r m ed el 吨 e xP e n m ent . K E Y WO R D S s hr o u d n o z l e ; ifn e b ub b l e : m ax 而um s 说e : p r e s s uer d i s itr b u t i o n