Experimental and numerical investigation of liquid-solid binary fluidized beds： Radioactive particle tracking technique and dense discrete phase model simulations

• Published in: Particuology 2017-08, Vol.33 (4), p.112-122
• Main Authors: Jain, Varsha, Kalo, Lipika, Kumar, Deepak, Pant, Harish J., Upadhyay, Rajesh K.
• Format: Article
• Language: English
• Subjects: Binary bed; Dense discrete phase model; Fluidized bed; Liquid–solid flow; Radioactive particle tracking; 实验; 放射性; 数值研究; 模型模拟; 液固流化床; 离散相模型; 粒子; 追踪技术
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2016.07.011

Liquid-solid binary fluidized beds are widely used in many industries. However, the flow behavior of such beds is not well understood due to the lack of accurate experimental and numerical data. In the current study, the behavior of monodisperse and binary liquid-solid fluidized beds of the same density but dif- ferent sizes is investigated using radioactive particle tracking （RPT） technique and a dense discrete phase model （DDPM）. Experiments and simulations are performed in monodisperse fluidized beds containing two different sizes of glass beads （0.6 and I mm） and a binary fluidized bed of the same particles for vari- ous bed compositions. The results show that both RPT and DDPM can predict the mixing and segregation pattern in liquid-solid binary fluidized beds. The mean velocity predictions of DDPM are in good agree- ment with the experimental findings for both monodisperse and binary fluidized beds. However, the axial root mean square velocity predictions are only reasonable for bigger particles. Particle-particle interac- tions are found to be critical for predicting the flow behavior of solids in liquid-solid binary fluidized beds.