工程科学学报，第39卷，第2期：196-201,2017年2月 Chinese Journal of Engineering,Vol.39,No.2:196-201,February 2017 DOI:10.13374/j.issn2095-9389.2017.02.005;http://journals.ustb.edu.cn 液态夹杂与固态夹杂碰撞聚合的物理模拟和机理 研究 倪 冰)四，聂海棋2)，张涛2) 1)钢铁研究总院冶金工艺研究所，北京1000812)东北大学治金学院，沈阳110819 ☒通信作者，E-mail:nibingzang(@sina.com 摘要针对钢液中液态夹杂与固态夹杂碰撞聚合的现象，采用水模型实验模拟了液态夹杂去除固态夹杂的行为.实验结 果表明：其与液滴去除夹杂的机理类似，流体内液滴与固粒的碰撞存在3种形式：惯性碰撞、截留捕获和尾流捕获。通过理论 公式计算了单独的惯性碰撞捕获效率及同时考虑惯性碰撞和截留的捕获效率，发现二者的趋势基本一致，尤其当液滴直径较 大时，二者曲线大致重合，因此，可以得出惯性捕获占据主导地位的结论.这与实验中观察到的液滴与固粒聚合大多数都是 惯性碰撞相吻合.对实验数据进行了分析计算，得到了实验中液滴捕获固粒的捕获效率，发现所得曲线与理论计算捕获效率 值相比，有一定差异，但是趋势基本一致.这是因为湍动程度较低，不同直径的捕获效率相对较为均匀，没有理论计算曲线那 样陡峭. 关键词液滴：固粒：夹杂物：捕获：聚合 分类号TF777.1 Physical simulation and mechanism study of solid inclusion removed by liquid inclusions NI Bing,NIE Hai-qi2),ZHANG Tao 1)Department of Metallurgical Technology,Central Iron and Steel Research Institute,Beijing 100081,China 2)School of Metallurgy,Northeastem University,Shenyang 110819.China Corresponding author,E-mail:nibingzang@sina.com ABSTRACT For studying the collision and coalescence phenomena between liquid inclusions and solid inclusions in liquid steel,a water model experiment was conducted to simulate the process of solid inclusions captured by liquid inclusions.The results show that the main mechanisms on coalescence of droplet and inclusion collision are inertial impaction,intercept capture and wake flow trapping. This is similar to the mechanism of solid inclusions removed by liquid inclusions in molten steel.After the efficiency of capture by in- ertial impaction and the efficiency of capture by inertial impaction and intercept capture were calculated through the theoretical formu- la,it is found that the trend of the two is the same basically.The two curves of efficiency are roughly coincident,especially when the droplet diameter is larger.Therefore,it can be concluded that inertial impaction dominates in both approaches,which is consistent with the observed phenomena in the experiment that the most coalescence of droplet and inclusion collision is inertial impaction.The experimental data were analyzed and calculated.It is shown that the efficiency of droplet capturing solid particles is different from the calculated theoretical capture efficiency,but the trend is basically the same.This is because the fluid turbulence is low,the capture efficiency of different droplet diameters is relatively uniform,not as steep as the theoretical curve. KEY WORDS droplet;solid particles;inclusions;capture;coalescence 收稿日期：2016-04-11 基金项目：国家自然科学基金资助项目(51374081)工程科学学报,第 39 卷,第 2 期:196鄄鄄201,2017 年 2 月 Chinese Journal of Engineering, Vol. 39, No. 2: 196鄄鄄201, February 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 02. 005; http: / / journals. ustb. edu. cn 液态 夹 杂 与 固 态 夹 杂 碰 撞 聚 合 的 物 理 模 拟 和 机 理 研究 倪 冰1) 苣 , 聂海棋2) , 张 涛2) 1) 钢铁研究总院冶金工艺研究所, 北京 100081 2) 东北大学冶金学院, 沈阳 110819 苣 通信作者, E鄄mail: nibingzang@ sina. com 收稿日期: 2016鄄鄄04鄄鄄11 基金项目: 国家自然科学基金资助项目(51374081) 摘 要 针对钢液中液态夹杂与固态夹杂碰撞聚合的现象,采用水模型实验模拟了液态夹杂去除固态夹杂的行为. 实验结 果表明:其与液滴去除夹杂的机理类似,流体内液滴与固粒的碰撞存在 3 种形式:惯性碰撞、截留捕获和尾流捕获. 通过理论 公式计算了单独的惯性碰撞捕获效率及同时考虑惯性碰撞和截留的捕获效率,发现二者的趋势基本一致,尤其当液滴直径较 大时,二者曲线大致重合,因此,可以得出惯性捕获占据主导地位的结论. 这与实验中观察到的液滴与固粒聚合大多数都是 惯性碰撞相吻合. 对实验数据进行了分析计算,得到了实验中液滴捕获固粒的捕获效率,发现所得曲线与理论计算捕获效率 值相比,有一定差异,但是趋势基本一致. 这是因为湍动程度较低,不同直径的捕获效率相对较为均匀,没有理论计算曲线那 样陡峭. 关键词 液滴; 固粒; 夹杂物; 捕获; 聚合 分类号 TF777郾 1 Physical simulation and mechanism study of solid inclusion removed by liquid inclusions NI Bing 1) 苣 , NIE Hai鄄qi 2) , ZHANG Tao 2) 1) Department of Metallurgical Technology,Central Iron and Steel Research Institute,Beijing 100081,China 2) School of Metallurgy,Northeastern University,Shenyang 110819,China 苣 Corresponding author, E鄄mail: nibingzang@ sina. com ABSTRACT For studying the collision and coalescence phenomena between liquid inclusions and solid inclusions in liquid steel, a water model experiment was conducted to simulate the process of solid inclusions captured by liquid inclusions. The results show that the main mechanisms on coalescence of droplet and inclusion collision are inertial impaction, intercept capture and wake flow trapping. This is similar to the mechanism of solid inclusions removed by liquid inclusions in molten steel. After the efficiency of capture by in鄄 ertial impaction and the efficiency of capture by inertial impaction and intercept capture were calculated through the theoretical formu鄄 la, it is found that the trend of the two is the same basically. The two curves of efficiency are roughly coincident, especially when the droplet diameter is larger. Therefore, it can be concluded that inertial impaction dominates in both approaches, which is consistent with the observed phenomena in the experiment that the most coalescence of droplet and inclusion collision is inertial impaction. The experimental data were analyzed and calculated. It is shown that the efficiency of droplet capturing solid particles is different from the calculated theoretical capture efficiency, but the trend is basically the same. This is because the fluid turbulence is low, the capture efficiency of different droplet diameters is relatively uniform, not as steep as the theoretical curve. KEY WORDS droplet; solid particles; inclusions; capture; coalescence