Mathematical Modelling of Gas Flow with Heavy Solid Particles Based on Eulerian Approach

Abstract

Complex hydrodynamic behavior of circulating fluidized beds makes their scale-up very complicated. In particular, large-scale lateral solids segregation causes a complex two-phase flow pattern which influences significantly their performance. This article discusses the advanced hydrodynamic model developed for circulating fluidized beds based on the two-fluid concept. In this model, the kinetic theory of granular flows (KTGF) was used to solve gas–solids flow behavior. To model the influence of direct particle-particle collisions the kinetic theory for granular flow was applied based on the Chapman–Enskog theory of dense gases. For model validation purposes, a cold flow circulating fluidized bed was employed in which solid particles was transported with air as fluidizing agent. The validity of the presented model has been tested with experimental data and information available in the literature, for both gas–particle and liquid–particle systems.