Development of a filtered drag model considering effect of the solid shear rate

• Published in: Particuology 2022-12, Vol.71, p.63-74
• Main Authors: Wang, Lingxue, Jiang, Ming, Zhou, Qiang
• Format: Article
• Language: English
• Subjects: Dimensionless solid shear rate; Filtered drag force; Fluidization; Gas–solid flows; Two-fluid model
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2022.01.015

[Display omitted] •Solid shear rate has a considerable impact on meso-scale structures.•Influence of solid shear rate on drag force can be divided into three stages.•A corrected method considering effect of solid shear rate is developed.•Solid shear rate correction model can improve simulation results. This study investigates a 2D gas–solid fast fluidized bed of typical Geldart A particles using highly resolved simulations with two-fluid model. The results show that the solid shear rate has a considerable impact on the orientation of the meso-scale structures and hence on the filtered drag force. On the basis of the correlation for the filtered drag force established in the literature using the traditional markers (such as filtered solid volume fraction, filtered slip velocity and filter scale), a correction correlated with the solid shear rate in the direction of gravity is proposed for better prediction of the filtered drag force. The corrected model is shown to produce improved results in posterior tests of flows in different fluidization regimes including bubbling, turbulent and fast fluidization.