Fluid flow and mixing in a six strand billet caster tundish: A parametric study
Fluid flow and mixing in a six strand billet caster tundish: A parametric study
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DOI：
10.2355/isijinternational.41.1437
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发表时间：
2001-12
影响因子：
1.8
通讯作者：
P. Jha;S. Dash;Sanjay Kumar
中科院分区：
文献类型：
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作者：
P. Jha;S. Dash;Sanjay Kumar
通过数值求解纳维斯托克斯方程以及包含中间包几何形状的边界拟合坐标系中的物质浓度方程，研究了六流方坯连铸机中间包中的混合现象。利用物质浓度方程的解来计算不同流动条件下中间包的混合量、死体积和塞体积。通过比较数值获得的停留时间分布曲线，首先验证了数值程序和求解算法，该曲线与Singh和Koria对单流裸中间包所做的实验非常吻合。 44) 据观察，六流中间包的混合物与死体积之比对于出口的特定位置具有最大值。在出口的特定位置（混合效果最好的地方），将 APB 放置在中间包底部，围绕进入的入口射流，并且 APB 的高度发生变化，以观察对中间包中混合的影响。据观察，随着 APB 的使用，混合与死体积的比率进一步增加，并达到峰值，之后随着 APB 高度的增加而降低，这表明存在最佳 APB 高度。在 APB 的最佳高度处，护罩浸入深度从 0 变为 400 mm。还观察到存在护罩的最佳浸入深度，其中混合与死体积的比率仍然达到另一个峰值，这意味着更好的混合。然而，将浸没深度增加到更高的值会显着破坏混合。
Mixing phenomena in a six strand billet caster tundish has been studied by numerically solving the Navier Stokes equations along with the species concentration equation in a boundary fitted coordinate system comprising the geometry of the tundish. The solution of the species concentration equation has been utilized to compute the mix, dead and plug volume of the tundish under different flow conditions. The numerical procedure and solution algorithm has been first verified by comparing the numerically obtained residence time distribution curve, which agree well with that of the experiments done for a single strand bare tundish by Singh and Koria. 44) It has been observed that the ratio of the mix to dead volume for the six strand tundish has a maximum value for a particular position of the outlets. At that particular position of the outlets (where mixing is best), an APB is placed on the bottom of the tundish surrounding the incoming inlet jet and the height of the APB has been varied to see the effect on mixing in the tundish. It has been observed that the ratio of mix to dead volume further increases with the use of APB and attains a peak value after which it decreases with the increase of the height of the APB signifying the existence of an optimum APB height. At this optimum height of the APB, the shroud immersion depth was made to change from 0 to 400 mm. It was also observed that there exists an optimum immersion depth of the shroud where the ratio of mix to dead volume still attains another peak signifying still better mixing. However, increasing the immersion depth to higher values spoils mixing significantly.