Abstract：In order to better explore the flow characteristics of gas in a cylindrical particle bed with a small tube to particle diameter ratio fixed bed. The discrete element method (DEM) was used to generate a strict cylindrical particle bed and to "bridge" the contact between the cylindrical particle-particle and the particle-wall. On the basis of verifying the feasibility of the simulation, the computational fluid dynamics software (CFD) was used to numerically simulate the flow process of air in a cylindrical particle bed and the overall void fraction, radial void fraction and flow field distribution of the fixed bed were obtained. The results showed that the wall effect was obvious in the fixed bed with small tube to particle diameter ratio, the radial void fraction in the near wall area had a large amplitude oscillation, and there was local unevenness in the velocity field. Gas was formed in the vicinity of the wall and in the loose area of the fill, and in some cases, areas of stagnant or reflow occurred in the particle wake.
Song Jiang,Zhang Yaxin. Gas Flow Characteristics in a Cylindrical Particle Bed in as Small Tube to Particle Diameter Ratio Fixed Bed[J]. 化学反应工程与工艺, 2018, 34(4): 317-324.
