Research Activities

XDEM: eXtended Discrete Element Method

The novel and innovative character of XDEM is to consider a packed or moving bed to be composed of a finite number of discrete particles which may have different properties, shapes or sizes. Motion of particles is described by the traditional Discrete Element Method (DEM). Additionally, each particle undergoes a sequence of thermodynamic processes that are described by a set of one-dimensional and transient conservation equations for mass, species momentum and energy by the Discrete Particle method (DPM) with sufficient accuracy. Heat, mass and momentum transfer couples the flow within the void spaces to the particles. Thus, the sum of all particle processes represents the overall packed bed process such as heat-up, drying, pyrolysis and gasification. This approach is applicable to a large range of different particle processes due to its generic concept and predicts results on a particle level with a large degree of details. The DPM module already contains relevant and validated kinetic data that allows predicting both temperature distribution and chemical reactions e.g. emissions for an individual particle shown in the following fig. 1 as a temperature distribution:

Image temperature profile

Temperature distribution in a particle dependent on time and space

Current Research Projects

Past Research Projects