Validation of mesoscience-based structural model for simulating gas–solid flows in circulating-turbulent fluidized beds

• Published in: Powder technology 2024-01, Vol.432, p.119136, Article 119136
• Main Authors: Wang, Yabin, Liu, Yige, Luo, Jiewen, Su, Chang, Zhao, Bidan, Wang, Junwu
• Format: Article
• Language: English
• Subjects: Circulating turbulent fluidized bed; Cluster diameter; Fluidization; Gas–solid flow structure; Multiphase flow; Particle technology
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2023.119136

The circulating-turbulent fluidized bed (CTFB) is an important fluidization regime that can maintain a high solid concentration and high reaction intensity as in turbulent fluidized bed, and suppress solids back-mixing as in circulating fluidized bed. Computational fluid dynamics (CFD) studies on it are however very sparse. In this study, extensive three-dimensional CFD simulations of CTFB are carried out using the mesoscience-based structural model (Liu et al., 2023), where the gas-rich dilute phase and the particle-rich dense phase are defined as the two interpenetrating continua, instead of treating the gas and particles as the two interpenetrating continua as in classical two-fluid models. It is shown that the model is able to faithfully predict the hydrodynamics of CTFB, in terms of axial and radial solid concentration profiles and radial solid velocity profiles. This study not only provides a systematical CFD study on the hydrodynamics of gas–solid flow in CTFB but also offers validations of the mesoscience-based structural model via simulating the hydrodynamics of new fluidization regime (CTFB). [Display omitted] •CFD simulation of circulating-turbulent fluidized beds was performed.•Gas-rich dilute phase and particle-rich dense phase are defined as interpenetrating continua.•Mesoscience-based structural model was validated.