Investigation on heat and mass transfer performance in drying process of drum dryer based on the DEM-CFD coupled

In order to analyse the heat and mass transfer characteristics of materials in a horizontal drum dryer, the discrete element method (DEM) was used to calculate the particle collision model and DEM-CFD coupled heat transfer model. With the increase of the rotating speed, the mixing degree gradually increases, and when the rotating speed is 16 rpm, the mixing degree is higher. When the heat flux of EDEM-CFD coupling is 0.2 W-1W, the particle temperature will gradually increase and tend to a fixed value. The residence time of the material has a great influence on the drying quality of the material particles. If the residence time is too short, the heat of the material will be uneven, and if the residence time of the material is too long, the damage of the material particles will increase, increased crushing rate.