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<p>To investigate the effects of electromagnetic fields (EMF) on argon bubble collisions, breakups, capture, and size distribution in a continuous casting mold, a 3D coupled model of the EMF and volume of fluid-discrete phase model has been developed. A model utilizing user definition function has been created to predict bubble interaction behavior under the EMF. The results show that the EMF causes bubbles near the mold walls to spiral with the molten steel. The bubbles mainly coalesce above the submerged entry nozzle (SEN) and near the narrow face. The bubbles near the narrow face move and accumulate toward the 1/4 width region due to the EMF, reducing the total volume of bubbles captured by solidified shell by 27.6&#xa0;pct and increasing the ratio of small-sized bubbles (0.5 to 1&#xa0;mm) among those captured by 16.7&#xa0;pct. For a 1300&#xa0;×&#xa0;230&#xa0;mm slab, a magnetic flux density of 0.075 T combined with a stirrer positioned 0.1&#xa0;m optimally facilitates bubble to distribute and accumulate above SEN and near the 1/4 width, enhancing their flotation removal efficiency which subsequently decreases their probability of being captured by solidified shell and improves the cleanliness of the molten steel.</p>

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Numerical Simulation of Bubbles Coalescence-Breakup and Capture Behavior in Continuous Casting Mold under Electromagnetic Field

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Xiaojia Zhou,
  • Tao Xu,
  • Anyuan Deng,
  • Qingshan Yang,
  • Lintao Zhang,
  • Engang Wang

摘要

To investigate the effects of electromagnetic fields (EMF) on argon bubble collisions, breakups, capture, and size distribution in a continuous casting mold, a 3D coupled model of the EMF and volume of fluid-discrete phase model has been developed. A model utilizing user definition function has been created to predict bubble interaction behavior under the EMF. The results show that the EMF causes bubbles near the mold walls to spiral with the molten steel. The bubbles mainly coalesce above the submerged entry nozzle (SEN) and near the narrow face. The bubbles near the narrow face move and accumulate toward the 1/4 width region due to the EMF, reducing the total volume of bubbles captured by solidified shell by 27.6 pct and increasing the ratio of small-sized bubbles (0.5 to 1 mm) among those captured by 16.7 pct. For a 1300 × 230 mm slab, a magnetic flux density of 0.075 T combined with a stirrer positioned 0.1 m optimally facilitates bubble to distribute and accumulate above SEN and near the 1/4 width, enhancing their flotation removal efficiency which subsequently decreases their probability of being captured by solidified shell and improves the cleanliness of the molten steel.