DEM simulation of fluidized bed with considering similarity model(Similarity condition from non-dimensional equations of change)

摘要

Discrete Element Method (DEM) is widely applied to the numerical simulations of fluidizedbeds. However, the computational expense increases explosively as the number of particlesincreases. This issue prevents DEM from applying to real-scale simulations.A model particle method is sometimes used in order to overcome this problem, in whichreal particles are replaced by larger model particles. When the model particle method isapplied, some conditions (e.g., superficial velocity, gas density, gas viscosity, particle density)must be adjusted. Those are referred to as the'similarity conditions'In this research the similarity conditions are derived from equations of change througha dimensionless analysis. Bubble motion is compared between the model particle cases andthe real particle case to validate the proposed similarity conditions. When the diameter of themodel particle is less than 7 times the real particle, the model particle case can predict thebubble motion in the real particle case.