Segregation of particulate solids: Experiments and DEM simulations |
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| Institution: | 1. Institut für Partikeltechnik, TU Braunschweig, Braunschweig, Germany;2. BASF SE, Ludwigshafen, Germany;1. GPI, Université de Technologie de Compiègne, B.P. 20.529, 60200 Compiègne, France;2. Institut für Partikeltechnik, TU Braunschweig, Volkmaroderstr. 4-5, 38104 Braunschweig, Germany;1. Section of Transport Engineering and Logistics, Department of Marine and Transport Technology, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628CD Delft, The Netherlands;2. Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran;1. School of Civil Engineering, Sun Yat-sen University, Guangzhou, China;2. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China;3. School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou, China;4. Department of Geotechnical Engineering & Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai, China;5. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China |
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| Abstract: | Segregation of granular materials is a complex phenomenon, difficult to measure quantitatively and to predict. Discrete element method (DEM) can be a useful tool to predict segregation effects and to support the industrial design. In this context, a very challenging idea is the characterization of the granular solids to provide the key parameters needed for a successful DEM simulation of segregation processes. Rolling friction, sliding friction and the coefficient of restitution are the critical parameters to be studied. These microscopic simulation parameters are calibrated by comparing the macroscopic behavior of granular matter in standard bulk experiments, which have the advantage of being highly repeatable and reliable.An experimental method is presented to characterize free surface segregation. The effects of different particle properties, particularly, shape and size, on segregation of cohesionless materials were investigated. From the experiments, particle size demonstrated a stronger effect on segregation than particle shape. Finally, the corresponding DEM simulations of the segregation experiments were presented. The parameters obtained by calibration were validated by the comparison of the modeled segregation behavior with the experimental results. Thus, calibrated DEM simulations are capable of predicting segregation effects. |
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| Keywords: | Bulk solids Particle shape Segregation DEM Discrete element method Silo |
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