炭阳极下“Fortin”型气泡运动的数值模拟  

Numerical investigation of Fortin bubble dynamics under carbon anode

作　　者：李茂[1] 白晓[1] 詹水清[1] 侯文渊[1] 李远[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《轻金属》2015年第8期31-35,共5页Light Metals

基　　金：国家高技术研究发展计划"863"资助项目(2010AA065201)

摘　　要：基于铝电解槽内二分之一个倾斜阳极的二维几何模型,采用VOF多相流计算方法分别对空气-水和二氧化碳-冰晶石两种系统中的单个"Fortin"型气泡的微尺度气泡运动行为进行了数值模拟研究,对比和分析了两种系统下"Fortin"型气泡的动力学特征。研究结果发现:两系统下随气泡体积增大,气泡会由扁平的椭球型变成具有厚而短的头部以及薄而长的尾部的"Fortin"型气泡;气泡终极滑移速度随气泡当量直径的增加而增大;气泡内部及周围流场存在一定差异。此微尺度研究结果可为减少阳极大气泡以及阳极效应的有效控制提供理论参考依据。Based on a two - dimensional geometry of half oblique anode of a real aluminum reduction cell, the motion of different sized bubbles （ micro - scale bubble dynamics） has been simulated by using the volume - of - fluid （VOF） method in air - water system and CO2 - cryolite system. Comparisons between the two systems are conducted through the dynamic characteristics of the ＂Fortin＂ bubbles. It is found that： with the increasing of bubble vol- ume, the bubble with circular shape tends to form a non - regular shape with thick head and a long thinner tail, which is called ＂Fortin＂ bubble. The mean sliding velocity increases as the bubble volume increases for both systems. The flow fluid inside and around the bubble has some differences. The micro - scale study provides theoretical basis for the reduction of anode large bubbles as well as the effective control of anode effect.

关 键 词：铝电解槽 “Fortin”型气泡 VOF 终极速度 

分 类 号：TQ133.1[化学工程—无机化工] O359[理学—流体力学]