(安徽工业大学机械工程学院，马鞍山243002)
摘 要: 针对高温镁熔液中氢气泡析出过程的可监控性难问题，利用建立的镁熔液氢气泡析出动力学模型分析多个因素对气泡析出动态变化的影响。采用传统的单因素法，设定不同初始半径、不同初始高度以及不同镁熔液温度的工艺参数条件，探究氢气泡的各项特性参数随时间的变化关系。将特定工艺参数下的动力学方程在MATLAB中进行编程计算，得到气泡上浮速度、气泡半径及气泡上浮高度的变化曲线。结果表明：在满足镁熔液-氢气泡相体系条件下，气泡初始形核高度及镁熔液温度对氢气泡析出变化影响较小，气泡初始半径对其析出影响较为显著。相同时刻下，氢气泡初始半径与气泡上浮速度、上浮高度都成正相关；且在一定变化范围内，随着气泡初始半径增大，气泡到达最大上浮速度的时间滞后性更大。
关键字: 镁熔液；氢气泡；工艺参数；动力学
（School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243002, China）
Abstract:For a problem of monitoring and controlling of hydrogen gas bubble in high temperature magnesium melt, a built kinetic model of hydrogen gas bubble evolution was used to analyze the effect of factors on bubble evolution. The traditional single factor analysis method was adapted to study the relationship of characteristic parameters of hydrogen gas bubble with time under the condition of setting up different process parameters, including primary radius, primary height and magnesium melt temperature. The dynamics formulas with different process parameters were calculated by MATLAB, the changing graphs of bubble rising speed, bubble radius and bubble rising height were gotten. The results show that, if the set parameters are satisfied for magnesium melt-hydrogen gas bubble phase system, the primary bubble nucleation height and magnesium melt temperature have little influence on bubble evolution, while the primary radius has more influence on that. Meanwhile, with the increase of the primary radius of bubble, the rise speed and rise height are all increasing at the same time. But, with the bubble radius increasing in a certain range, the time researching up to the maximum rising speed has larger delay.
Key words: magnesium melt; hydrogen gas bubble; process parameter; dynamics
