钢液内气泡尾涡去除夹杂物的物理模拟

采用物理模拟方法,基于莫顿数相等及夹杂物运动行为相似准则,采用聚乙烯粒子模拟钢液中夹杂物,并采用高速摄像技术记录气泡及夹杂物颗粒的运动行为,分析了气泡尾涡对夹杂物去除的影响机理.实验结果表明:在气泡尾涡作用下,夹杂物运动轨迹表现为两种方式:一是夹杂物从气泡下端两侧向气泡尾涡靠近,随气泡上浮一段距离后上升速度变快,然后脱离气泡尾涡区;二是位于气泡上方的夹杂物,在不与气泡发生碰撞黏附的条件下,以回旋方式运动至气泡下方,然后在尾涡区内随气泡上浮,从而沿竖直方向以回旋方式上升.在相同上浮距离条件下,与小气泡相比,大气泡的尾涡去除夹杂物颗粒的效果更好.

Physical Simulation of Inclusion Removal by Bubble Trailing Vortex in Liquid Steel

Based on the equal Morton number and inclusion movement similarity， the polyethylene particle was employed to simulate inclusions in liquid steel. The high speed video-photography was used to record the movement of bubble and inclusion. The mechanism of inclusion removal by bubble trailing vortex was analyzed. The experimental results show that there are two kinds of inclusion trajectories under bubble trailing vortex. One is that the inclusions approach to the bubble trailing vortex under both sides of bubble and enter the bubble trailing vortex zone， then float with a greater velocity before leaving the bubble trailing vortex zone. The other is that the inclusions above the bubble move to the bubble rear in a circuit manner without collision or attachment each other， then float with bubble in the trailing vortex and rise helically along the vertical direction. On the condition of the same floatation distance， the effect of the larger bubble trailing vortex on inclusion removal is better than that of the smaller bubble.