Multi-hole ceramic filter is regarded as an effective and cheap method of additional flow control device in tundish. In order to evaluate the performance of the ceramic filter, a transient three-dimensional (3D) comprehensive numerical model has been developed to study the flow pattern, temperature distribution and residence time of the molten steel, as well as the elimination of inclusion in a full size two-strand tundish. One-way coupled Euler–Lagrange approach with random walk model was adopted to track the inclusion motion trajectory. The gravity, buoyancy, drag, virtual mass, lift, pressure gradient, and rebound forces were included. The inclusion Reynolds number was utilized for the judgment of the inclusion separation at the slag-steel interface and the internal surface of the filter hole. Besides, the residence time distribution curve has been analyzed for figuring out the macroscopic mixing of the molten steel. The results indicate that the ceramic filter increases the flow resistance of the molten steel in the tundish, resulting in a longer residence time and a higher temperature drop. Except removed by the covering molten slag, the inclusion could also be trapped by the filter hole when the molten steel travels through the ceramic filter. The elimination of the smaller inclusion is significantly improved. The removal ratio of the 1 μ m inclusion in the tundish without ceramic filter is only 59.3 pct, while the value is improved to 65.3 pct if we apply the ceramic filter with slenderness ratio of 3 to the tundish. And with the slenderness ratio changing from 3 to 5, the removal ratio of the 1 μ m inclusion increases from 65.3 to 72.0 pct. Additionally, the ceramic filter could counteract certain side effects of the increasing inclusion density on the removal, especially for the smaller inclusion. With the inclusion density increasing from 3990 to 5000 kg/m 3 , the removal ratio of the 1 μ m inclusion decreases by 14.5 pct in the tundish without ceramic filter, and after using the ceramic filter, the removal ratio decreases by 13.0, 7.4, and 5.0 pct with the slenderness ratio varies from 3 to 5.

中文翻译：

---

多孔陶瓷过滤器对双流中间包夹杂物去除效果的CFD研究

多孔陶瓷过滤器被认为是中间包附加流量控制装置的一种有效且廉价的方法。为了评估陶瓷过滤器的性能，开发了瞬态三维 (3D) 综合数值模型来研究钢水的流动模式、温度分布和停留时间，以及消除夹杂物全尺寸两股中间包。采用带随机游走模型的单向耦合欧拉-拉格朗日方法跟踪夹杂物运动轨迹。重力、浮力、阻力、虚拟质量、升力、压力梯度和回弹力都包括在内。夹杂物雷诺数用于判断钢渣界面和滤孔内表面夹杂物的分离情况。除了，分析了停留时间分布曲线，以确定钢水的宏观混合。结果表明，陶瓷过滤器增加了中间包内钢水的流动阻力，导致停留时间更长，温降更大。钢水通过陶瓷过滤器时，夹杂物除了被覆盖的熔渣去除外，还可能被过滤孔截留。较小夹杂物的消除得到显着改善。不带陶瓷过滤器的中间包对1μm夹杂物的去除率仅为59.3%，而在中间包上加长细比为3的陶瓷过滤器，去除率提高到65.3%。并且随着细长比从3变为5，1μm夹杂物的去除率从65.3增加到72.0 pct。此外，陶瓷过滤器可以抵消增加夹杂物密度对去除的某些副作用，特别是对于较小的夹杂物。随着夹杂物密度从3990增加到5000 kg/m 3 ，没有陶瓷过滤器的中间包对1 μm夹杂物的去除率降低了14.5%，使用陶瓷过滤器后，去除率降低了13.0、7.4，和 5.0 pct 细长比从 3 到 5 不等。