首页>
外文期刊>ISIJ international
>Numerical Simulation on Bubble Behavior of Disintegration and Dispersion in Stirring-Injection Magnesium Desulfurization Process
【24h】
Numerical Simulation on Bubble Behavior of Disintegration and Dispersion in Stirring-Injection Magnesium Desulfurization Process
An numerical model for the bubble behavior of disintegration and dispersion is developed by using the model of Euler two-phase flows coupled with the bubble population balance model (BPBM). The gas volume fraction, and bubble size distribution are investigated under different stirring modes and gas flow rates. The results show that bubble behavior of disintegration and dispersion is the best under the clockwise-anticlockwise stirring mode (C-ARM), where effects of impeller rotating speed on the bubble behavior of disintegration and dispersion are different under different stirring modes. The excessive increasing in gas flow rate is not helpful for bubble behavior of disintegration and dispersion, while the gas holdup increases gradually and the mixing time increases rapidly with increasing the gas flow rate. The impeller under C-ARM with 2 rad/s for 2 s switching and the gas flow rate not exceeding 2.0 Nm~(3)h~(?1) are recommended to use for the present system, which can optimize the bubble behavior of disintegration and dispersion in the most space of ladle except for the bottom one. Moreover, numerical results show a good agreement against experimental ones.
展开▼
机译：通过使用欧拉两相流模型和气泡总体平衡模型（BPBM），建立了一个用于崩解和分散的气泡行为的数值模型。研究了不同搅拌方式和气体流速下的气体体积分数和气泡尺寸分布。结果表明，在顺时针-逆时针搅拌模式（C-ARM）下，崩解和分散的气泡行为是最好的，在不同的搅拌模式下，叶轮转速对崩解和分散的气泡行为的影响是不同的。气体流量的过度增加不利于崩解和分散的气泡行为，而气体的滞留量随着气体流量的增加而逐渐增加，并且混合时间迅速增加。建议在本系统中使用2 rad / s的C-ARM进行2 s切换的叶轮，并且气体流量不超过2.0 Nm〜（3）h〜（？1），这样可以优化气泡的性能。除底部钢包外，在钢包的大部分空间内发生分解和分散。而且，数值结果表明与实验结果吻合良好。
展开▼
