Euler–Lagrange Two‐Way‐Coupled Simulation of Multiphase Flow and Meniscus Dynamics in an Argon‐Blown Slab Mold With Chamfered Corners

Chamfered mold technology effectively mitigates corner transverse cracks in microalloyed steel slabs by modifying heat transfer. However, paradoxically, when combined with argon blowing, the chamfered geometry induces distinct hydrodynamic behaviors. Specifically, it generates low‐velocity recirculation zones near the narrow face that preferentially trap bubbles, a phenomenon absent in conventional right‐angle molds. In this study, a high‐fidelity Euler–Lagrange two‐way‐coupled mathematical model was developed to investigate the gas–liquid two‐phase flow in a 1490 mm × 230 mm slab‐chamfered mold, validated by water modeling. A systematic parametric study was conducted to examine the effects of casting speed (0.6–1.8 m/min), argon flow rate (0–15 L/min), mold geometry (30°, 45°, 60° chamfered, and right‐angle corners), and submerged entry nozzle (SEN) design. Results reveal opposing influences: increasing casting speed enhances jet momentum, suppressing bubble‐induced flow, whereas higher argon flow promotes a transition from double‐roll to single‐roll patterns. Quantitative analysis shows that the maximum meniscus fluctuation reaches 8.9 mm at 15 L/min, exceeding the safety threshold by 78%, indicating high slag entrainment risk. Furthermore, the chamfered geometry, particularly the 30° design, reduces corner surface velocity compared to right‐angle molds, increasing bubble entrapment risk. These findings provide quantitative guidance for optimizing chamfered mold technology and argon blowing parameters.