Simulation of Argon Gas Flow Effects in a Continuous Slab Caster
Simulation of Argon Gas Flow Effects in a Continuous Slab Caster
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DOI：
10.1007/bf02650074
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发表时间：
1994-08
期刊：
影响因子：
--
通讯作者：
B. Thomas;X. Huang;R. C. Sussman
中科院分区：
文献类型：
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作者：
B. Thomas;X. Huang;R. C. Sussman
基于有限体积的流体、热量和质量传递的三维数值模型已经被开发并应用于帮助解释连铸钢板过程中多相流体流动、过热耗散和级配混合等复杂的相互关联现象。用连续介质模型模拟了气泡，计算了气体的体积分数和速度，以及它们对液体流动的影响。湍流已被纳入使用标准k -ε湍流模型。在注气和不注气的全尺寸水模型中，预测速度与相应的测量和观测结果之间取得了合理的一致。通过对典型板坯连铸机的数值模拟，研究了氩气气泡注入对连铸机流动现象的影响。氩气气泡改变了上部再循环区的流动形态，使撞击点和再循环区向上移动。随着气体馏分的增加和气泡尺寸的减小，效果越明显。氩气的注入也会导致过热在铸体中被移除，使热点向上移动，降低峰值热流密度，并增加从宽面和半月板区域的热量提取。在钢种转变过程中，喷氩对板坯表面成分有轻微影响，但对板坯内部的混合没有影响。
Three-dimensional finite-volume-based numerical models of fluid, heat, and mass transport have been developed and applied to help explain the complex inter-related phenomena of multiphase fluid flow, superheat dissipation, and grade intermixing during the continuous casting of steel slabs. Gas bubbles are simulated using a continuum model, which calculates the volume fraction and velocities of the gas, and its effect on the liquid flow. Turbulence has been incorporated using the standardK-εturbulence model. Reasonable agreement has been achieved between predicted velocities and corresponding measurements and observations in full-scale water models, both with and without gas injection. The effects of argon gas bubble injection on flow-related phenomena are investigated with simulations of a typical steel slab caster. Argon bubbles alter the flow pattern in the upper recirculation zone, shifting the impingement point and recirculation zones upward. The effect increases with increasing gas fraction and decreasing bubble size. Argon injection also causes superheat to be removed higher in the caster, moves the hot spot upward, lowers the peak heat flux, and increases heat extraction from the wide face and meniscus regions. During a steel grade transition, argon injection slightly affects slab surface composition but has no effect on intermixing in the slab interior.