连铸结晶器内Ar气泡破碎-聚合和捕获行为的数值模拟

徐涛, 邓安元, 李阳, 王恩刚

Numerical Simulation of Ar Bubbles Fragmentation-Polymerization and Trapping Behavior in Continuous Casting Mold

XU Tao, DENG Anyuan, LI Yang, WANG Engang

表1 模拟计算主要参数

Table 1 Parameters of numerical simulation

Process parameter Symbol Value Unit Mold length, width, and thickness Lm × Wm × Tm 800 × 1300 × 230 mm3 Nozzle diameter din 80 mm Nozzle outlet height and width Hout × Wout 83 × 65 mm2 Nozzle angle dθ -10, -15, -20 (°) Nozzle immersion depth dim 130, 180, 230 mm Casting speed vp 1.2, 1.4, 1.6 m·min-1 Degree of superheat Tsub 15 K Initial particle diameter of argon bubbles dinit 1 mm Ar blowing rate Qb 5, 10, 20 L·min-1 Density of molten steel ρ 7020 kg·m-3 Viscosity of molten steel μ 0.0067 Pa·s-1 Specific heat capacity at constant pressure cp 750 J·kg-1·K-1 Thermal conductivity λ 30 W·m-1·K-1 Coefficient of thermal expansion γt 0.0001 K-1 Latent heat Lh 270 kJ·kg-1 Argon-liquid steel surface tension coefficient γb 1.4 N·m-1 Bubble density ρb 0.56 kg·m-3 Solidus temperature TS 1730 K Liquidus temperature TL 1786 K