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Volume 24 Issue 11
Nov.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(11): 1251-1259
Bing Ni, Tao Zhang, Hai-qi Ni,  and Zhi-guo Luo, Mechanism and simulation of droplet coalescence in molten steel, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1251-1259. https://doi.org/10.1007/s12613-017-1517-z
Cite this article as:
Bing Ni, Tao Zhang, Hai-qi Ni,  and Zhi-guo Luo, Mechanism and simulation of droplet coalescence in molten steel, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1251-1259. https://doi.org/10.1007/s12613-017-1517-z
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研究论文

Mechanism and simulation of droplet coalescence in molten steel

  • Department of Metallurgical Technology, Central Iron and Steel Research Institute, Beijing 100081, China

  • School of Metallurgy, Northeastern University, Shenyang 110004, China

  • 通讯作者:

    Tao Zhang    E-mail: zhangt1022@gmail.com

  • Droplet coalescence in liquid steel was carefully investigated through observations of the distribution pattern of inclusions in solidified steel samples. The process of droplet coalescence was slow, and the critical Weber number (We) was used to evaluate the coalescence or separation of droplets. The relationship between the collision parameter and the critical We indicated whether slow coalescence or bouncing of droplets occurred. The critical We was 5.5, which means that the droplets gradually coalesce when We ≤ 5.5, whereas they bounce when We > 5.5. For the carbonate wire feeding into liquid steel, a mathematical model implementing a combined computational fluid dynamics (CFD)-discrete element method (DEM) approach was developed to simulate the movement and coalescence of variably sized droplets in a bottom-argon-blowing ladle. In the CFD model, the flow field was solved on the premise that the fluid was a continuous medium. Meanwhile, the droplets were dispersed in the DEM model, and the coalescence criterion of the particles was added to simulate the collision-coalescence process of the particles. The numerical simulation results and observations of inclusion coalescence in steel samples are consistent.
    • Research Article

    Mechanism and simulation of droplet coalescence in molten steel

    + Author Affiliations
      Abstract
    • Droplet coalescence in liquid steel was carefully investigated through observations of the distribution pattern of inclusions in solidified steel samples. The process of droplet coalescence was slow, and the critical Weber number (We) was used to evaluate the coalescence or separation of droplets. The relationship between the collision parameter and the critical We indicated whether slow coalescence or bouncing of droplets occurred. The critical We was 5.5, which means that the droplets gradually coalesce when We ≤ 5.5, whereas they bounce when We > 5.5. For the carbonate wire feeding into liquid steel, a mathematical model implementing a combined computational fluid dynamics (CFD)-discrete element method (DEM) approach was developed to simulate the movement and coalescence of variably sized droplets in a bottom-argon-blowing ladle. In the CFD model, the flow field was solved on the premise that the fluid was a continuous medium. Meanwhile, the droplets were dispersed in the DEM model, and the coalescence criterion of the particles was added to simulate the collision-coalescence process of the particles. The numerical simulation results and observations of inclusion coalescence in steel samples are consistent.
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