摘要
基于群体平衡模型,在奥斯特瓦尔德熟化的基础上,考虑布朗碰撞对分子扩散长大的影响,建立了钢液中Al2O3夹杂物碰撞生长的动力学模型,包括分子扩散长大以及由于布朗、斯托克斯和湍流碰撞引起的夹杂物聚集、生长,采用颗粒尺寸分组法对夹杂物的聚集生长进行了模拟.结果表明,湍动能耗散率从0.1 m2/s3增加到10 m2/s3时,对临界尺寸以下粒径的分子微粒的数量密度影响较小,但对临界尺寸以上大粒径夹杂物分子微粒的数量密度影响较大.碰撞过程中,夹杂物最大数量密度对应的极值直径约为0.2μm.
The growth kinetic models of non-metallic Al2O3 inclusions in liquid steel based on population balance model are developed to simulate their molecular diffusion and growth resulting from Brownian, Stokes and turbulent collisions. Brownian collision is considered in the stage of molecular diffusion, besides, Ostwald ripening. Particle-size-grouping method is applied to simulate the aggregation and growth of inclusions. The results show that the change of inclusion number density is slight for the inclusion diameter smaller than critical size, and significant for the diameter bigger than critical size as turbulent energy dissipation rate increases from 0.1 to 10 m2/s3. The peak-value diameter is around 0.2μm corresponding to the maximum number density during collision and growth.
出处
《过程工程学报》
CAS
CSCD
北大核心
2014年第1期101-107,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51004001)
教育部科学技术重点项目(编号:211074)
住房和城乡建设部科学技术项目(编号:2012-K4-41)
