电磁搅拌钢包内气泡聚并破裂行为

结合气液两相流欧拉模型与考虑气泡破碎聚并的颗粒群平衡模型，研究了电磁搅拌下底吹钢包内流场分布及气泡尺寸分布.结果表明:搅拌器向上搅拌时钢包内形成一个大循环流场，而向下搅拌时钢包内形成了一个大的回流区和一个小的回流区.钢包内气泡分布为气液两相区中心区域气泡直径最大，气液两相区边界处直径较小，且从气液两相区中心到气液边界气泡直径逐渐减小.电流越大，气液两相区域在垂直方向上偏转程度越大，而且电流越大，气液两相区中心大气泡分布区域也越大.电磁搅拌器向下搅拌时气液两相中心区域大气泡直径分布区域小于向上搅拌.大气泡偏转程度小于小气泡，大气泡偏向钢包中心轴线一侧.

Bubble Breakup and Coalescence in Electromagnetic Stirring Ladle

A mathematical model for the gas-liquid flow field in the ladle with argon blowing and electromagnetic stirring was developed based on the Euler model and population balance model(PBM). The results show that the upward stirring only forms a large circulation flow field in the ladle， while the downward stirring forms a large and a small circulation flow fields. The size of the bubble in the center of gas-liquid region is the largest and is gradually reduced when the bubble is changed from the center to the boundary of the gas-liquid two-phase region. With increasing electromagnetic stirring current， the deflection degree in vertical direction in gas-liquid two-phase region is greater and the distribution of large-sized bubble area in the center of the gas-liquid two-phase region becomes wider. The area of large-sized bubbles in the central region from the downward stirring is smaller than that from the upward stirring. The spatial distribution of large-sized bubbles has less effect on the deflection and bends to the center line of the ladle.