铝合金旋转脉冲精炼过程气泡形成与运动(Ⅱ)——数值模拟

• 作 者: 吴士平 王汝佳 王晔 王惠 熊守美
• 机 构: 哈尔滨工业大学金属精密热加工国家级重点实验室,清华大学机械工程系,
• 出 处: 特种铸造及有色合金
• 发表日期: 2013年12期
• 关键词: Rotary Pulse Refining Bubble VOF Model Numerical Simulation

对铝合金旋转脉冲精炼过程的气泡运动规律进行了研究,采用VOF模型及数值模拟方法模拟了气泡在液体中的运动行为,研究了液相物性对气泡形成以及上升过程的影响。结果表明,气泡经历了形核与长大过程,气泡形核初期呈现球状,在随后的脱离和长大过程中,气泡的形状发生改变,从球状变为椭球状。随着粘度增加,气泡的形状趋近于球状,运行轨迹从曲线趋近于直线。随着表面张力增大,气泡越来越难以变形,气泡开始破碎的时间推迟,甚至不发生破碎。

The bubble motion of aluminum alloy during pulse pulse refining was studied. The VOF model and numerical simulation were used to simulate the bubble behavior in liquid. The effect of liquid phase properties on bubble formation and ascending process was also studied. The results show that the bubble undergoes the nucleation and growth process, and the bubble nucleation presents spherical shape at the initial stage. During the subsequent detachment and growth, the shape of the bubble changes from spherical to ellipsoidal. As the viscosity increases, the shape of the bubble tends to be spherical and the trajectory approaches the straight line from the curve. As the surface tension increases, the bubbles become more and more difficult to deform, the time at which the bubbles begin to crumble is delayed, or even broken.