Analysis of filtration process of 3-D mesh spacer filter by using CFD-DEM simulation

Abstract Filtration by the fibrous medias is recognized as one of the most effective methods to control particulate pollution. A type of 3-D mesh spacer filter (3-D filter) proposed is effective for filtrating the large particles with low pressure drop. This study described the flow characteristics of dust-containing gas within the 3-D filter by means of CFD-DEM model. The influences of air velocity, particle concentration and restitution coefficient of particle on the filtration performance as well as the particles deposition process were simulated. The results showed that the particles capturing efficiency of 3-D filter was increased with the air velocity and particle concentration while the particles rebound made the filtration efficiency decreased when the air speed was increased more than 3.0 m/s. For the particle properties, the smaller restitution coefficient, the higher filtration efficiency. When the quality of particle deposition was increased to 70 g/m2, the filtration efficiency almost remained unchanged.