液态钐铁合金中氮气泡的运动行为
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摘要
对于钢包内底吹气体的精炼方法,通过物理实验和理论计算相结合的方法,研究了液态钐铁合金中底吹氮气泡的运动行为,重点讨论了氮气泡在液态钐铁合金中上浮时的形态。结果表明:液态钐铁合金中,底吹氮气泡生成时的最小压力与外界气压以及吹气管的半径有关;当外界压力一定时,吹气管的半径越小,生成气泡所需的最小压力越大;当吹气管的半径一定时,生成气泡所需的最小压力随外界压力的增大而增大。在常压条件下,底吹氮气泡半径随时间的的增大而增大,实验表明,2.5 s之前,氮气泡的长大速率比较缓慢。同一时刻,压力越大则氮气泡的半径越小,且不同压力下氮气泡的长大速率不同,压力越大,气泡的长大速率越小。
For the refining method of blowing gas from the bottom of ladle, the movement behavior of bottom-blown nitrogen bubbles in liquid Sm-Fe alloy were studied through combination of physical experiment and theoretical calculation,and the morphology of nitrogen bubbles during the floating in the liquid Sm-Fe alloy were emphatically discussed. The results show that in the liquid Sm-Fe alloy, the minimum pressure in the formation of bottom blowing nitrogen bubbles is related to the ambient pressure and the radius of blow pipe. When the ambient pressure is certain, the smaller the radius of the blowing pipe is, the bigger the minimum pressure required to generate bubbles is. When the radius of bowing pipe is fixed, the minimum pressure needed to generate bubbles increases with the increase of the ambient pressure. Under normal pressure, the radius of the bottom blowing nitrogen bubble increases with the increase of time. The experiment shows that the growth rate of nitrogen bubbles is slow before 2.5 s. At the same time, the bigger the pressure is, the smaller the radius of the bubble is. In addition, the growth rate of nitrogen bubbles is different under different pressures. The bigger the pressure is, the smaller the growth rate of the bubbles is.
For the refining method of blowing gas from the bottom of ladle, the movement behavior of bottom-blown nitrogen bubbles in liquid Sm-Fe alloy were studied through combination of physical experiment and theoretical calculation,and the morphology of nitrogen bubbles during the floating in the liquid Sm-Fe alloy were emphatically discussed. The results show that in the liquid Sm-Fe alloy, the minimum pressure in the formation of bottom blowing nitrogen bubbles is related to the ambient pressure and the radius of blow pipe. When the ambient pressure is certain, the smaller the radius of the blowing pipe is, the bigger the minimum pressure required to generate bubbles is. When the radius of bowing pipe is fixed, the minimum pressure needed to generate bubbles increases with the increase of the ambient pressure. Under normal pressure, the radius of the bottom blowing nitrogen bubble increases with the increase of time. The experiment shows that the growth rate of nitrogen bubbles is slow before 2.5 s. At the same time, the bigger the pressure is, the smaller the radius of the bubble is. In addition, the growth rate of nitrogen bubbles is different under different pressures. The bigger the pressure is, the smaller the growth rate of the bubbles is.
引文
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[2]车得福,林宗虎,陈学俊.气泡在液体中形成的试验研究[J].钢铁研究学报,1994(1):9-14.
[3]车得福,李会雄.多相流及其应用[M].西安:西安交通大学出版社,2007:1-4.
[4]Sezkely J,Wang H J,Kaiser K M.Flow pattern velocity and turbulence energy measurements and predictions in a water model of an argon-stirred ladle[J].Metallurgical Transactions B,1976,7(2):287-295.
[5]Szekely J,Lehner T,Chang C W.Flow phenomena,mixing and mass transfer in argon-stirred ladles[J].Ironmaking&Steelmaking,1979,6(6):285-293.
[6]唐萍,周海,李敬想,等.钢包底吹氩钢液流动行为与夹杂去除率的关系[J].过程工程学报,2015,15(5):744-745.
[7]巨建涛,王睿,折媛,等.钢包底吹氩去除钢中夹杂物的数值模拟[J].过程工程学报,2015,15(1):68-69.
[8]李孟,李向阳,王宏智,等.鼓泡塔气液两相流不同曳力模型的数值模拟[J].过程工程学报,2015,15(2):181-182.
[9]林仕,黄成,李学来.水平降膜管外液膜厚度分布[J].过程工程学报,2017,17(2):210.
[10]杨志方,杜峰,王晓杰,等.反应器类型对流动影响的数值模拟[J].过程工程学报,2015,15(5):721-722.
[11]王若瑾,徐军,龙文宇,等.矩形错流移动床稠密气固两相流的实验和模拟[J].过程工程学报,2015,15(3):361-362.
[12]范兵强,张洋,郑诗礼,等.气液搅拌体系中宏观气含率的预测[J].过程工程学报,2016,16(4):565-566.
[13]李光晓,王钊,范怡平,等.气液两相逆流-错流撞击洗涤器内两相流动与传质特性[J].过程工程学报,2015,15(2):199.
[14]陈方圆,李平平,李向阳,等.侵入式光纤照相法测量气泡尺寸分布[J].过程工程学报,2016,16(3):361-362.
[15]朱江江,陈柏义.水面舰船尾流气泡半径变化规律的研究[J].热科学与技术,2005,4(2):146-147.