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首页> 外文会议>International Symposium on Computer Applications in Metals Processing Aug 26-29, 2001 Toronto, Ontario, Canada >The Effects of Mold Heat Extraction Rates on the 3D Turbulent Transport Phenomena and Solidification in a Continuous Slab Caster for Steel
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The Effects of Mold Heat Extraction Rates on the 3D Turbulent Transport Phenomena and Solidification in a Continuous Slab Caster for Steel

机译：铸型连铸机中结晶器吸热速率对3D湍流传输现象和凝固的影响

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摘要

It is now well known that the quality of the slab and unwanted breakouts depend critically on the rate of heat transfer at the mold walls of a continuous casting system. In this study, we have evaluated the effects of various heat extraction rates on the mold through the numerical modeling of three-dimensional coupled turbulent flow, heat transfer, and solidification in a continuous slab caster for stainless steel. The generalized transport equations for the model are based on the continuum mixture formulation which are applicable to the liquid, mushy and solid regions within the caster. The turbulent characteristics of the molten steel were taken into account through the implementation of the now popular low-Reynolds number κ-ε turbulence model by Launder and Sharma. For the mushy region, the model was modified by suitably imposing a damping coefficient to suppress the turbulent effect in that region. The model equations were iteratively solved employing the non-dimensional primitive variables and using the control volume based finite-difference scheme on a staggered grid. The effects of the various heat extraction rates on the velocity, temperature and turbulent eddy viscosity distributions as well as the extent of the solidification and mushy regions were reported and discussed. The slab surface temperature profiles were also plotted in a three-dimensional perspective in order to obtain a clear understanding of the developed thermal fields. The present numerical predictions of solidification profile are compared with the other numerical results available from simple heat transfer models and limited experimental data. A significant discrepancy between the 3-D model and the simple heat transfer models was found although a very good agreement was found with the experiment results.
机译：现在众所周知，板坯的质量和不希望的破裂严重地取决于连续铸造系统的模具壁处的热传递速率。在这项研究中，我们通过三维连铸不锈钢板坯连铸机中的三维耦合湍流，传热和凝固的数值模型，评估了各种排热速率对模具的影响。该模型的通用运输方程基于连续混合配方，适用于连铸机内的液体，糊状和固体区域。通过由Launder和Sharma实施目前流行的低雷诺数κ-ε湍流模型，考虑了钢水的湍流特性。对于糊状区域，通过适当地施加阻尼系数以抑制该区域的湍流效应来修改模型。使用无量纲原始变量并在交错网格上基于控制量的有限差分方案迭代求解模型方程。报道并讨论了各种热量提取速率对速度，温度和湍流涡流粘度分布以及凝固和糊状区域的程度的影响。还以三维透视图绘制了板坯表面温度曲线，以便对已开发的热场有清晰的了解。将当前凝固轮廓的数值预测与可从简单传热模型和有限的实验数据获得的其他数值结果进行比较。尽管与实验结果非常吻合，但在3-D模型和简单传热模型之间发现了显着差异。

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