摘要
为了揭示铝熔体净化工艺中除气箱内净化气体的分布特性,利用欧拉模型和多参考坐标系法对铝熔体旋转喷吹除气过程中的气液两相流场进行了数值模拟,考察了离底间隙、气泡直径、除气箱形式等不同因素对流场产生的影响.结果表明,气体易从除气箱中心区域上浮至自由液面逃逸,边壁区的铝熔体不能与足够数量的氩气进行有效接触,不利于边壁区铝熔体的除氢,且在45°相位角位置处更加严重.减小离底间隙、减小气泡尺寸、采用方形除气箱可改善除气箱内气相的分布状况,有利于铝熔体的除氢.
In order to reveal the distribution characteristic of purged gas in degassing tank for molten aluminum cleansing, the Eulerian two-fluid model incorporated with the multiple reference frame method was adopted to predict the gas-liquid flow field that occurs during the rotating spray degassing of aluminum melt. The influ- ences of different factors, such as spinning rotor clearance from the tank bottom, bubble diameter and tank ge- ometry on the flow fields were analyzed. Results show that argon is apt to escape from the central zones of liq- uid surface. The melt/bubble interfaces in the area near the tank wall are seriously inadequate, which decrea- ses the efficiency of hydrogen removal from the melt, and worsens in the longitudinal section with 45~phase an- gle. The smaller spinning rotor clearance from the tank bottom, the smaller size bubbles and square degassing tank can improve the gas distribution, and thus have the advantage the hydrogen removal.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2010年第5期619-623,共5页
Materials Science and Technology
基金
上海市教委项目(06VZ005)
上海市教育委员会重点学科建设项目(J51902)
关键词
旋转喷吹
气液两相流
数值模拟
气含率
rotating spray degassing
gas-melt two phase flow
numerical simulation
gas volume fraction
