Identification of Block-Like Movement in Cohesive and Non-Cohesive Spouted Bed Operations
Sprache des Titels:
Proceedings of the 5th International Conference on Particle-based Methods
Spouted beds are widely used in the chemical and process industries for a large variety of processes. Good understanding of the transport phenomena in these systems is of great importance to improve the design and scale-up procedure . Gas- solid flow heterogeneities, such as particle clustering can have a significant impact on interphase transport properties. The focus of the research is on the interaction between solid particles and interstitial gas. The investigation is realized by means of non-resolved CFD-DEM simulation and the experimental measurement of the spouted bed.
Experimental measurements are conducted in a lab-scale pseudo-2D spouted bed test facility. The cohesive material is substituted by non-cohesive particles with an added moister. With wet particles, it is expected to observe the effects related to the particle cohesion, such as channeling and formation of particle clusters. The main purpose of the experiment is to obtain the information on the overall dynamics of the spouted bed in cohesive and non-cohesive flow regimes. The recorded images were processed with DaVis Particle Image Velocimetry (PIV) post-processing tool.
Numerical CFD-DEM model is developed to investigate the behavior of non-cohesive particles in a spouted bed. Particles are modeled with the Discrete Element Method (DEM), where one integrates Newton?s law of motion for each particle under the forces due to the surrounding particles. This method is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact [2, 3]. Coupled CFD-DEM simulations allow the incorporation of single-particle properties and modifications of their interaction and as such are suitable for this study. Numerical simulation can be validated by the experimental measurement. Future work will deal with cohesive forces between the particles.