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<p>In previous numerical modeling studies of continuous casting molds, particle capture criteria have been classified into two categories: those based on critical conditions and those relying on force equilibrium mechanisms. This study proposes an improved particle capture criterion by integrating the flow characteristics of molten steel and particle motion behavior at the solidification front. A dedicated computational framework was established, incorporating critical parameters such as variation of molten steel flow velocity along the casting direction, particle velocity vectors, residence time, and dendrite tip growth velocity. A multi-size argon bubble transport model coupled with inverse heat flux calculation was developed for the mold, explicitly accounting for argon bubble collision, coalescence, and breakup. The discrepancies in capture counts and spatial distributions between the traditional critical-condition-based criterion and the improved criterion were systematically investigated. Key factors influencing large argon bubble (diameter &gt; 0.3&#xa0;mm) capture were analyzed. The results demonstrate that the improved criterion significantly reduces predicted argon bubble capture counts, with orders-of-magnitude differences for bubbles larger than 0.3&#xa0;mm. Captured bubbles are predominantly distributed 4 to 8&#xa0;mm below the strand subsurface. Spatially, capture zones are concentrated 160 to 450&#xa0;mm below the meniscus and within 200&#xa0;mm from the narrow face hot face. The intensity of the mainstream was identified as the dominant factor governing both the quantity and spatial distribution of large bubble capture. This study provides theoretical support for accurately characterizing particle capture mechanisms in continuous casting molds and optimizing process parameters to mitigate subsurface defects.</p>

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A Multiphase Flow-Coupled Particle Capture Criterion for Continuous Casting Molds: Argon Bubble Transport and Solidification Front Interactions

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • ZiJian Wei,
  • BoRan Tao,
  • KaiWen Yan,
  • XiaoBing Yang,
  • LianDong Zhang,
  • QiCan Wang,
  • YongHui Cheng,
  • Man Yao,
  • XuDong Wang

摘要

In previous numerical modeling studies of continuous casting molds, particle capture criteria have been classified into two categories: those based on critical conditions and those relying on force equilibrium mechanisms. This study proposes an improved particle capture criterion by integrating the flow characteristics of molten steel and particle motion behavior at the solidification front. A dedicated computational framework was established, incorporating critical parameters such as variation of molten steel flow velocity along the casting direction, particle velocity vectors, residence time, and dendrite tip growth velocity. A multi-size argon bubble transport model coupled with inverse heat flux calculation was developed for the mold, explicitly accounting for argon bubble collision, coalescence, and breakup. The discrepancies in capture counts and spatial distributions between the traditional critical-condition-based criterion and the improved criterion were systematically investigated. Key factors influencing large argon bubble (diameter > 0.3 mm) capture were analyzed. The results demonstrate that the improved criterion significantly reduces predicted argon bubble capture counts, with orders-of-magnitude differences for bubbles larger than 0.3 mm. Captured bubbles are predominantly distributed 4 to 8 mm below the strand subsurface. Spatially, capture zones are concentrated 160 to 450 mm below the meniscus and within 200 mm from the narrow face hot face. The intensity of the mainstream was identified as the dominant factor governing both the quantity and spatial distribution of large bubble capture. This study provides theoretical support for accurately characterizing particle capture mechanisms in continuous casting molds and optimizing process parameters to mitigate subsurface defects.