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Numerical Analysis of Fluid Flow and Heat Transfer by Means of a Unified Model in a Direct Current Electric Arc Furnace
Steel Research International ( IF 1.9 ) Pub Date : 2021-02-23 , DOI: 10.1002/srin.202000664 Cong-Lin Yao 1 , Hong-Chun Zhu 1 , Zhou-Hua Jiang 1, 2 , Tao Pan 1
Steel Research International ( IF 1.9 ) Pub Date : 2021-02-23 , DOI: 10.1002/srin.202000664 Cong-Lin Yao 1 , Hong-Chun Zhu 1 , Zhou-Hua Jiang 1, 2 , Tao Pan 1
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Herein, a unified 2D axially symmetric model coupling the plasma arc and molten bath in a direct current electric arc furnace is established, with the physical phenomena at the plasma arc/molten bath interface to be confronted by the “local thermodynamic equilibrium diffusion approximation” method. After ensuring model validation and grid independence test, the fluid flow and heat transfer processes are analyzed. The numerical investigation reveals that in terms of the relative importance of driving forces in the molten bath, an anticlockwise eddy is formed at the molten bath center driven by electromagnetic force, whereas a clockwise eddy is formed near the lateral part of the molten bath driven by buoyancy force. Regarding the distribution of heat flux, the convection–conduction and radiation heat govern the rate of heat transfer from the plasma arc to the molten bath. In addition, for larger arc current, higher arc power in the plasma arc region and higher heating rates in the molten bath are obtained when the arc length is held constant; for shorter arc length, lower arc power in the plasma arc region but higher heat transfer efficiency in the molten bath is attained when the arc current is held constant.
中文翻译：
基于统一模型的直流电弧炉流体流动和传热数值分析
在此，建立了直流电弧炉中等离子弧与熔池耦合的统一二维轴对称模型，用“局部热力学平衡扩散近似”方法来解决等离子弧/熔池界面处的物理现象. 在确保模型验证和网格独立性测试后，分析流体流动和传热过程。数值研究表明，就熔池中驱动力的相对重要性而言，在电磁力的驱动下熔池中心形成逆时针涡流，而在熔池侧面附近形成顺时针涡流，由电磁力驱动。浮力。关于热流分布，对流-传导和辐射热控制着从等离子弧到熔池的热传递速率。此外，对于较大的电弧电流，在保持电弧长度不变的情况下，在等离子弧区获得更高的电弧功率和在熔池中更高的加热速率；对于较短的电弧长度，等离子弧区域的电弧功率较低，但当电弧电流保持恒定时，熔池中的传热效率较高。
更新日期：2021-02-23
中文翻译：
基于统一模型的直流电弧炉流体流动和传热数值分析
在此，建立了直流电弧炉中等离子弧与熔池耦合的统一二维轴对称模型，用“局部热力学平衡扩散近似”方法来解决等离子弧/熔池界面处的物理现象. 在确保模型验证和网格独立性测试后，分析流体流动和传热过程。数值研究表明，就熔池中驱动力的相对重要性而言，在电磁力的驱动下熔池中心形成逆时针涡流，而在熔池侧面附近形成顺时针涡流，由电磁力驱动。浮力。关于热流分布，对流-传导和辐射热控制着从等离子弧到熔池的热传递速率。此外，对于较大的电弧电流，在保持电弧长度不变的情况下，在等离子弧区获得更高的电弧功率和在熔池中更高的加热速率；对于较短的电弧长度，等离子弧区域的电弧功率较低，但当电弧电流保持恒定时，熔池中的传热效率较高。
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