Argon bubbles are usually injected into steel continuous casting mold to prevent the clogging of submerged entry nozzle (SEN), but some bubbles may be entrapped to form defects in the final slab. In order to provide a reference for improving the quality of steel, a mathematical model based on the Eulerian-Lagrangian approach with advanced bubble break-up and coalescence models was established to study the effect of operation conditions on bubble distribution in a steel continuous casting mold. A bubble break-up model based on a daughter bubble fraction, which is suitable for the continuous casting system, was considered. The mathematic model was validated by comparing of the size and number of captured bubbles with the plant measurements of previous work. The result shows that argon gas injection has obvious effect on the flow pattern in the upper recirculation zone of the mold. In the upper recirculation zone, the bubbles mean diameter decreases and the bubble number increases with increasing casting speed, and both of the bubble size and number increase with the increase of gas flow rate. From the result, it can be found that the number and diameter of bubbles arriving at the advancing solidified shell region increase with increasing casting speed. In addition, the increase of gas flow rate causes more bubbles arriving at the advancing solidified shell region, but has little effect on the size of bubbles.

通常将氩气气泡注入到钢连铸模具中，以防止淹没浸入式喷嘴（SEN）堵塞，但是有些气泡可能会被夹带而在最终的铸坯中形成缺陷。为提高钢的质量提供参考，建立了基于欧拉-拉格朗日方法和高级气泡分解及聚结模型的数学模型，以研究工作条件对连铸结晶器中气泡分布的影响。 。考虑了基于子气泡分数的气泡破裂模型，该模型适用于连续铸造系统。通过比较捕获的气泡的大小和数量与先前工作的工厂测量结果，验证了数学模型。结果表明，注入氩气对模具上部回流区的流态有明显影响。在上部回流区中，气泡的平均直径减小，气泡数量随铸造速度的增加而增加，气泡的尺寸和数量均随气体流量的增加而增加。从该结果可以发现，到达提前的凝固壳区域的气泡的数量和直径随着铸造速度的增加而增加。另外，气体流速的增加导致更多的气泡到达前进的凝固壳区域，但是对气泡的尺寸影响很小。气泡的大小和数量都随着气体流速的增加而增加。从该结果可以发现，到达前进的凝固壳区域的气泡的数量和直径随着铸造速度的增加而增加。另外，气体流速的增加导致更多的气泡到达前进的凝固壳区域，但是对气泡的尺寸影响很小。气泡的大小和数量都随着气体流速的增加而增加。从该结果可以发现，到达前进的凝固壳区域的气泡的数量和直径随着铸造速度的增加而增加。另外，气体流速的增加导致更多的气泡到达前进的凝固壳区域，但是对气泡的尺寸影响很小。