(安徽工業(yè)大學(xué)機(jī)械工程學(xué)院，馬鞍山243002)
摘 要: 針對高溫鎂熔液中氫氣泡析出過程的可監(jiān)控性難問題，利用建立的鎂熔液氫氣泡析出動力學(xué)模型分析多個因素對氣泡析出動態(tài)變化的影響。采用傳統(tǒng)的單因素法，設(shè)定不同初始半徑、不同初始高度以及不同鎂熔液溫度的工藝參數(shù)條件，探究氫氣泡的各項特性參數(shù)隨時間的變化關(guān)系。將特定工藝參數(shù)下的動力學(xué)方程在MATLAB中進(jìn)行編程計算，得到氣泡上浮速度、氣泡半徑及氣泡上浮高度的變化曲線。結(jié)果表明：在滿足鎂熔液-氫氣泡相體系條件下，氣泡初始形核高度及鎂熔液溫度對氫氣泡析出變化影響較小，氣泡初始半徑對其析出影響較為顯著。相同時刻下，氫氣泡初始半徑與氣泡上浮速度、上浮高度都成正相關(guān)；且在一定變化范圍內(nèi)，隨著氣泡初始半徑增大，氣泡到達(dá)最大上浮速度的時間滯后性更大。
關(guān)鍵字: 鎂熔液；氫氣泡；工藝參數(shù)；動力學(xué)
（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
