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Numerical and Modeling Analysis of Fluid Flow and Heat Transfer of Liquid Steel in a Tundish with Different Flow Control Devices

机译:不同流量控制装置的中间包中钢液的流动与传热的数值模拟分析

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摘要

Fluid flow and heat transfer of liquid steel in a two-strand tundish of a slab caster were analyzed using water modeling and numerical techniques. Three cases were considered: A bare tundish, a tundish equipped with a pair of weirs and a pair of baffles (arrangement TI&B) and a tundish equipped with a turbulence inhibitor and a pair of baffles (arrangement TI&B). The water modeling, under isothermal conditions, indicated the existence of a strong bypass-flow for the bare tundish and the W&B arrangement while the TI&B arrangement reported a longer minimum residence time and higher plug flow characteristics. Numerical results verified the trend mentioned with the water model. The numerical study showed also that cold and hot steel affected considerably the flow patterns of steel due to the existence of buoyancy forces. In the case of a step-input of cold steel, bypass-flow was intensified for the bare tundish and the tundish with a W&B arrangement. When a step input of hot steel is introduced into the system buoyancy forces make the steel to flow preferentially near the free surface.
机译:利用水模型和数值技术,分析了板坯连铸机两股中间包中钢液的流动和传热。考虑了三种情况:一个裸露的中间包,一个装有一对堰和一对挡板的中间包(布置TI&B)和一个装有湍流抑制剂和一对挡板的中间包(布置TI&B)。等温条件下的水模型表明,裸包中间包和W&B装置存在强大的旁通流,而TI&B装置报告了更长的最小停留时间和更高的塞流特性。数值结果验证了水模型中提到的趋势。数值研究还表明,由于存在浮力,冷热钢对钢的流动方式有很大影响。在冷钢步进输入的情况下,裸露中间包和带W&B布置的中间包的旁通流量增加。当将热钢的步进输入引入系统时,浮力使钢优先在自由表面附近流动。

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