Multi-fluid Eulerian simulation of fluidization characteristics of mildly-cohesive particles: Cohesive parameter determination and granular flow kinetic model evaluation

摘要

The typical granular kinetic model, the cohesive granular kinetic model based on the contact bonding energy (Kim-Arastoopour-Huilin model) and the cohesive granular kinetic model based on the excess compressibility (Ye et al.'s model) were comprehensively compared in terms of kinetic parameters, bed expansion, and bubble behavior. The calculation methods of the contact bonding energy loss and the excess compressibility were presented, and the inter-relationship between the two cohesive parameters was revealed. The three kinetic models predict consistent kinetic parameters in dilute gas-solid flow region, while Ye et al.'s model always predicts a lower value when the solid fraction is above 0.15. The Kim-Arastoopour-Huilin model and Ye et al.'s model predicts opposite variations of solid pressure with increasing cohesion. Increasing cohesion interaction reduces the granular shear viscosity and bulk viscosity. Kim-Arastoopour-Huilin model and Ye et al.'s model outperform the typical kinetic model in terms of the bubble diameter and rising velocity. (C) 2020 Elsevier B.V. All rights reserved.