摘要
本文用电位法自动扫描在线测试系统测量了底吹自由表面的形状,考察了喷吹流量,喷嘴大小及液面高度对自由表面形状的影响。在继研究初始段和上升段流动特性的基础上,建立了自由表面形状的数学模型和末段的气、液上升速度模型。模型和实验达到较好地一致.
The free surface shape of the bottom-blown process is measured by use of an automatic scanning on-line measurement system with electropotential rrrethod.The influences of flow rate,nozzle diameters and the depth of liquid bath on the free surface are investigated.On the bases of studying the flow characteristics of initial and middle bubble rising regions,mathematical models for the free surface shape and gas-liquid rising velocity in the upper region are established. From the experimentation and calculation by these models,we can see that the free surface height is increased with the increase of gas injection flow rate and with the decrease of liquid depth;the free surface shape bec- omes steepy with the decrease of nozzle diameters and the liquid depth,but the influence of diameter variation on the variation of free surface height is not notable.Combining this study with former investigation,we can predict completely the gas-liquid rising velocity distribution along all the liquid depth in the jet zone of the bottom-blown process.Therefore,the deficiency of buoyance model has been overcome by the present study.The calculated values by this model are in good agreement with experiments.
出处
《化工冶金》
CSCD
北大核心
1989年第2期85-89,共5页
基金
国家自然科学基金资助
关键词
底吹
熔池
自由表面
数学模拟
Bottom-blown process
Free surface shape
Multiple flow
Gas-liquid rising velocity
