Tian Yushi, Xu Lijun, Qiu Shengtao, Zhu Rong
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China.
Materials (Basel). 2023 Jun 28;16(13):4666. doi: 10.3390/ma16134666.
In this paper, a fully coupled large eddy simulation model, including the volume of fluid model, the discrete phase model, the bubble-collision model, and the bubble-breakup model was used to simulate the spatial distribution of multi-size bubbles and its impact on the instantaneous two-phase flow in a slab continuous-casting mold. The influence of the bubble-interaction model on the bubbles' three-dimensional spatial distribution and size distribution, as well as on two-phase flow was discussed. By comparison with the velocity on the meniscus and the average bubble diameter inside a continuous-casting slab water model, the appropriate numerical model was recommended to accurately simulate the two-phase flow and characteristics of discrete bubbles. The submerged entry nozzle and the area around it saw bubble coalescence and breakage more frequently than other areas. The key interaction between the bubbles was their bouncing in the deep region of the mold. In the mold, the average bubble diameter was 0.741 mm, and 44.5% of the total number of bubbles had an approximately average diameter.
本文采用一个完全耦合的大涡模拟模型，该模型包括流体体积模型、离散相模型、气泡碰撞模型和气泡破碎模型，用于模拟板坯连铸结晶器中多尺寸气泡的空间分布及其对瞬时两相流的影响。讨论了气泡相互作用模型对气泡三维空间分布和尺寸分布以及对两相流的影响。通过与结晶器弯月面处的速度和连铸板坯水模型内气泡平均直径进行比较，推荐了合适的数值模型，以准确模拟两相流和离散气泡的特性。浸入式水口及其周围区域比其他区域更频繁地出现气泡聚并和破碎现象。气泡之间的关键相互作用是它们在结晶器深部区域的弹跳。在结晶器中，气泡平均直径为0.741mm，且占气泡总数44.5%的气泡直径近似为平均值。
