This study describes a new tanks-in-series model for analyzing non-ideal flow regimes in a single-strand tundish. The tundish was divided into two interconnected tanks, namely an inlet tank and an outlet tank. A water model experiment was carried out to separately measure the residence-time distribution (RTD) of the two tanks. Drift beads were adopted in the water model experiment to simulate the non-metallic inclusions in molten steel. Dead volume fraction was evaluated by analyzing measured RTD curves. The ratio between mixed flow volume and plug flow volume was proposed as a new criterion to evaluate the inclusion removal. In the inlet tank, a higher mixed flow fraction was preferred to effectively release turbulent kinetic energy and enhance inclusion collision growth. In the outlet tank, a higher plug flow fraction was preferred to facilitate inclusion removal by flotation. The optimal positions of the weir were recommended based on the RTD analysis and the inclusion removal from the results of water model experiments. A theoretical equation was derived based on the tanks-in-series model, providing a good fitting function to analyze the experimental data. The confirmation test was performed by applying computational fluid dynamics simulations of liquid steel flow in the real tundish.

中文翻译：

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储罐串联模型在连铸中间包非理想流态表征中的应用

这项研究描述了一种新的串联式储罐模型，用于分析单股中间包中的非理想流动状态。中间包被分成两个相互连接的罐，即入口罐和出口罐。进行了水模型实验以分别测量两个水箱的停留时间分布（RTD）。在水模型实验中采用漂移珠来模拟钢水中的非金属夹杂物。通过分析测得的RTD曲线评估死体积分数。提出了混合流量与活塞流量的比值作为评价夹杂物去除率的新标准。在进料罐中，较高的混合流量分数是优选的，以有效释放湍动能并增强夹杂物碰撞的增长。在出水槽里 优选较高的活塞流分数以促进通过浮选除去夹杂物。根据RTD分析和水模型实验结果中的夹杂物去除，推荐了堰的最佳位置。基于串联坦克模型推导了理论方程，为分析实验数据提供了良好的拟合功能。通过应用真实中间包中钢水流动的计算流体动力学模拟来执行确认测试。