Model Experiment on Inclusion Removal by Bubble Flotation Accompanied by Particle Coagulation in Turbulent Flow
Model Experiment on Inclusion Removal by Bubble Flotation Accompanied by Particle Coagulation in Turbulent Flow
复制标题
DOI：
10.2355/isijinternational.49.965
复制
发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Taniguchi, Shoji
中科院分区：
文献类型：
--
作者：
Arai, Hirotada;Matsumoto, Katsutoshi;Taniguchi, Shoji
钢水精炼过程中夹杂物的形核、扩散、凝聚和去除等行为是一个复杂的过程，而数学模拟可以对每种行为进行详细的描述。关于包容行为的个体机制，人们已经做了大量的工作。然而，对整个行为的认识还不是很清楚，尤其是对组合现象的实验评价至今还没有得到充分的开展。本研究在搅拌槽中进行了聚苯乙烯颗粒在电解液中混凝的气泡气浮冷模实验，实验条件为湍流。此外，根据水模实验的观测结果，提出了湍流中气泡浮选的经验公式。将该经验方程与颗粒混凝的粒子数平衡方程相结合，预测了去除速率。此外，对Nakaoka等人提出的人口平衡方程进行了修正。结果表明，气泡浮选与混凝的线性耦合模型适用于不同条件下颗粒数密度和粒度分布随时间变化的预测。
Inclusion behavior like nucleation, diffusional growth, coagulation and removal in steel refining are complicated process, whereas mathematical simulation makes it possible to describe each behavior in detail. Many works have been performed in respect of the individual mechanism of inclusion behavior. However, the whole behavior is not clearly understood yet, and especially, an experimental evaluation of combined phenomena has not been carried out sufficiently until now. In this study, a cold model experiment of bubble flotation accompanied by coagulation of polystyrene particle in an electrolyte solution has been conducted in an agitated vessel under turbulent flow condition. In addition, an empirical equation of bubble flotation in a turbulent flow has been proposed from observed results of the water model experiment. This empirical equation has been combined with the population balance equation on particle coagulation, and removal rates have been predicted. Furthermore, a correction has been adopted in the population balance equation proposed by Nakaoka et al. Resultantly, a linear coupling model with bubble flotation and coagulation has been verified its applicability to a prediction of time dependence of particle number density and size distributions under various conditions.