稀土金属钆在双辊薄带连铸过程中流动、传热和凝固行为的数学模拟

Mathematical Simulation of Fluid Flow,Heat Transfer,and Solidification Behaviors of Rare-Earth Metal Gadolinium during Continuous Casting of Twin-Roll Strip

采用ANSYS Fluent商业软件,建立了三维流动和传热数学模型,探索了不同浇注温度下稀土金属钆在双辊薄带连铸过程中的流动、传热和凝固行为。结果表明:浇注温度对钆液的流动模式和铸坯的温度分布影响很小;浇注温度从1673 K升高至1698 K再至1723 K,回流区面积增大,液面流速减小,整体铸坯温度提高,凝固坯壳减薄,凝固终点位置下移;1723 K浇注温度下铸坯在中心对称面出口处未完全凝固,容易发生漏液;在浇注温度为1673 K条件下,可以获得较合理的凝固坯壳厚度分布。

A three-dimensional mathematical model of fluid flow and heat transfer was developed by employing the commercial software ANSYS Fluent, and the fluid flow, heat transfer and solidification behaviors of rare-earth metal gadolinium during continuous casting of twin-roll strip at different pouring temperatures were explored. The results showed that the pouring temperature had little effect on the flow pattern of liquid gadolinium and the temperature distribution of the strand. When the pouring temperature increased from 1 673 K to 1 698 K and then to 1 723 K, the area of the recirculation zone increased, the velocity of the liquid level decreased, the temperature of the overall strand increased, the solidifying shell became thinner, and the solidification end moved down. When the pouring temperature was 1 723 K, the strand was not fully solidified at the outlet of the symmetry plane, which was prone to breakout. At the pouring temperature of 1 673 K, the reasonable distribution of solidifying shell thickness could be obtained.