钢液中Al_2O_3夹杂物颗粒布朗碰撞聚合的三维可视化数值模拟研究  

Three-dimensional Visualization Numerical Simulation Research of Brown Collisions and Aggregation Process Between Al_2O_3 Inclusions in Steel

作　　者：王耀[1] 李宏[1] 郭洛方[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,冶金与生态工程学院,北京100083

出　　处：《太原理工大学学报》2014年第2期151-156,共6页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(51074020)

摘　　要：在应用分形理论对凝聚态Al2O3夹杂物形貌结构进行定量分析的基础上,建立了不同尺寸形貌凝聚态Al2O3布朗运动的控制方程。使用Matlab编程,对不同初始条件下钢液中微观区域内Al2O3夹杂物颗粒之间布朗碰撞聚合过程进行了可视化数值模拟研究。研究结果表明:钢液中微观区域内细小Al2O3夹杂物颗粒的布朗运动是大尺寸凝聚态Al2O3生成的重要原因。夹杂物粒子体积浓度和布朗运动步长对其布朗碰撞聚合过程影响较大。在高体积浓度、大运动步长的条件下,Al2O3夹杂物颗粒之间的布朗凝聚速率较大,同时更容易形成大尺寸、结构致密的凝聚态Al2O3。On the basis of the quantitative description of condensed Al2O3 inclusion＇ morphology using fractal theory, Brown motion control equation of condensed Al2O3. inclusions with different sizes and morphologies was built. And then, Brown collision and aggregation process between Al2O3 inclusions in steel were researched by numerical simulation. The results show that： to a great extend, Brown collision and aggregation between tiny Al2O3 inclusions in micro steel region results in the formation of large condensed Al2O3. Volume concentration and Brown motion step of Al2O3 inclusion have a great influence on the collision and aggregation process. Under the condition of high volume concentration and large motion step, Brown co A12O3 inclusions becomes larger, and it is easier to form condensed Al2O3inc and dense structure. lision rate between usions with big size

关 键 词：分形理论 布朗运动 碰撞凝聚 运动步长 

分 类 号：TF777.1[冶金工程—钢铁冶金]