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Numerical investigation of gas bubble behavior in tapered fluidized beds
Particuology ( IF 3.5 ) Pub Date : 2017-09-25 , DOI: 10.1016/j.partic.2017.05.013
Ramin Khodabandehlou , Hossein Askaripour , Asghar Molaei Dehkordi

In this article, the behavior of gas bubbles in tapered fluidized beds is investigated with the use of a two-fluid model incorporating kinetic theory of granular flow. The effects of various parameters such as apex angle, particle size, and particle density on the size distribution and the rise velocity of gas bubbles were examined. In addition, the simulation results for the bubble fraction and axial velocity of gas bubbles were compared with experimental data reported in the literature and good agreement was observed. As the apex angle was increased, the fraction of gas bubbles with large sizes increased and the fraction of bubbles with small sizes decreased. As the particle size increased, the fraction of gas bubbles with large diameters decreased; however, the fraction of bubbles with medium diameters increased. The obtained results clearly indicate that an increased solid density increased the bubble rise velocity up to a specified height and reduced the velocity at larger heights, in tapered fluidized beds.



中文翻译:

锥形流化床中气泡行为的数值研究

在本文中,使用结合了颗粒流动动力学理论的双流体模型研究了锥形流化床中气泡的行为。检查了诸如顶角,粒径和粒径之类的各种参数对粒径分布和气泡上升速度的影响。此外,将气泡分数和气泡轴向速度的仿真结果与文献中报道的实验数据进行了比较,并观察到了很好的一致性。随着顶角的增加,大尺寸气泡的比例增加,而小尺寸气泡的比例减少。随着粒径的增加,大直径气泡的比例降低;反之,则降低。但是,中等直径的气泡比例增加了。

更新日期:2017-09-25
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