Zihan Yuan, Shuyan Wang, Baoli Shao, Xi Chen, Lei Xie, Jiawei Fan, 'Simulation study on the flow behavior of wet particles in the power-law liquid-solid fluidized bed', Powder Technology, Volume 415, 118117, 2023 https://doi.org/10.1016/j.powtec.2022.118117. (https://www.sciencedirect.com/science/article/pii/S0032591022009986)
Abstract: The liquid film wrapped around the wet particles contributing to the flow behavior of particles is computationally investigated using Eulerian-Eulerian two-fluid model (TFM) with the kinetic theory of granular flow (KTGF). The drag coefficient of power-law liquid-solid flow is simulated by modified drag force models concentrating on the power-law fluids proposed by our group. The dynamic normal restitution coefficient model is proposed, where the effect of liquid film thickness on the restitution coefficient of wet particles is considered. Profiles of the properties of the granular kinetic theory are presented and discussed to describe the effects of liquid film on the flow behavior of particles. The existence of liquid film involves the normal restitution coefficient, which leads to a higher drag coefficient, meanwhile, big particles are covered by the thicker liquid film, compared to small particles. Supported by the liquid film, it is shown that the collision intensity between particles weakens and the bed pressure drop is reduced. Furthermore, the predicted void fractions are compared with experimental data from Miura et al. and Broniarz et al. The relative errors of the models incorporating dynamic normal restitution coefficient range from 0.66% to 1.82%, lower than those of a specific coefficient ranging from 1.44% to 3.58%.
Keywords: Dynamic normal restitution coefficient model; Liquid film thickness; Two-fluid model; Kinetic theory of granular flow; Liquid-solid fluidized bed