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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of transport phenomena in continuous casting of non-dendritic billets
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Modeling of transport phenomena in continuous casting of non-dendritic billets

机译：非枝晶坯坯连铸过程中传输现象的建模

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摘要

A macroscopic model for simulating the phase change process and transport of solid fraction is developed for the case of solidification during direct chill continuous casting of a non-dendritic Al-alloy billet, in presence of electromagnetic stirring. Maxwell's equations are solved to obtain the electromagnetic force field, which is incorporated in the momentum conservation equations as body force source terms. Thereafter, the complete set of equivalent single-phase governing equations (mass, momentum, energy, species conservation and transport of solid fraction) are solved using a pressure-based finite volume method. A variable viscosity approach is employed to model fluid flow in presence of phase change. The model is first validated against some experimental and numerical results available in the literature, pertaining to the case of conventional continuous casting without any externally imposed stirring. The model predicts the temperature, velocity, species and most importantly, the solid fraction distribution in the mold. These predictions are then used for studying the influence of initial superheat, stirring intensity and cooling rate on the macroscopic behavior of the system.
机译：在电磁搅拌的情况下，针对非枝晶铝合金坯料的直接冷连续铸造过程中的凝固情况，开发了一种用于模拟相变过程和固形物传输的宏观模型。求解麦克斯韦方程组以获得电磁力场，将其作为体力源项并入动量守恒方程组。此后，使用基于压力的有限体积法求解整套等效单相控制方程（质量，动量，能量，物种守恒和固体成分的运输）。采用可变粘度方法来模拟存在相变时的流体流动。首先根据文献中可获得的一些实验和数值结果对模型进行验证，该结果与常规连续铸造的情况有关，无需任何外部施加的搅拌。该模型可以预测温度，速度，种类，最重要的是可以预测模具中固体成分的分布。然后将这些预测用于研究初始过热，搅拌强度和冷却速率对系统宏观行为的影响。

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