Simulation of Gas Solid Flow in Quasi Two Dimensional Fluidized Bed by Immersed Boundary Method

Abstract

Gas solid two phase flow occurs in multiple fields of industry. Therefore, a study researching the phenomena of this type of systems is highly adequate. In the present work subsonic, compressible flow equation in conservative Euler form is solved numerically on PC by a two step finite difference method, which is validated by the analytical solution of Sod’s shock tube problem. Fluid solid interaction is described by Immersed Boundary Method, where body force is calculated by direct forcing algorithm. Two dimensional simulation of a single solid circle shaped particle motion in the gas flow is calculated and compared to the trajectory of a particle recorded by a high speed camera measurement system in a laboratory scale quasi two dimensional fluidized bed. Image processing algorithms are implemented to track the motion of a chosen single. Comparison of experimental measurement and simulation resulted in the same magnitude of particle velocities. The possible reasons of differences and opportunities of improving the results are discussed in the study. The results are promising, and the presented preliminary simulator can be a useful tool in supporting industrial design and operation after further developments.