The influence of particle properties on pressure signals in dense gas-fluidised beds: a computer simulation study

Abstract

A hard-sphere discrete particle model of a gas-fluidised bed was used in order to study the influence of particle properties on pressure signals in dense gasfluidised beds. In the model the gas-phase hydrodynamics is described by the spatially averaged Navier-Stokes equations for two-phase flow. For each solid particle the Newtonian equations of motion are solved taking into account the inter-particle and particle-wall collisions. Pressure fluctuations inside the bed are strongly affected by the coefficients of restitution and friction: the more energy is dissipated in collisions the stronger the fluctuations are. The root mean square of the pressure fluctuations showed an almost linear dependency on the amount of energy dissipated in collisions during the simulation