Discrete element method study of shear-driven granular segregation in a slowly rotating horizontal drum |
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| Affiliation: | 1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India;2. School of Civil Engineering, The University of Sydney, Sydney 2006, NSW, Australia;3. Institute for Applied Materials (IAM-WBM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany;1. Laboratoire Réactions et Génie des Procédés, Université de Lorraine (UMR 7274 CNRS), 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France;2. Laboratoire d''Energétique et de Mécanique Théorique et Appliquée, Université de Lorraine (UMR 7563 CNRS), 2 avenue de la forêt de Haye, BP 160, 54518 Vandœuvre-lès-Nancy Cedex, France;1. Cain Department of Chemical Engineering, LA State University, Baton Rouge 70803, USA;2. ANSYS Inc, 15915 Katy Fwy, Houston 77094, USA;3. Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400 094, India;1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. School of Engineering, Newcastle University, NE1 7RU, United Kingdom |
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| Abstract: | Segregation and mixing of granular materials are complex processes and are not fully understood. Motivated by industrial need, we performed a simulation using the discrete element method to study size segregation of a binary mixture of granular particles in a horizontal rotating drum. Particles of two different sizes were poured into the drum until it was 50% full. Shear-driven segregation was induced by rotating the side-plates of the drum in the opposite direction to that of the cylindrical wall. We found that radial segregation diminished in these systems but did not completely vanish. In an ordinary rotating drum, a radial core of smaller particles is formed in the center of the drum, surrounded by larger revolving particles. In our system, however, the smaller particles were found to migrate toward the side-plates. The shear from anti-spinning side-plates reduces the voidage and increases the bulk density. As such, smaller particles in the mixer tend to move to denser regions. We varied the shear by changing the coefficient of friction on the side-plates to study the influence of shear rate on this migration. We also compared the extent of radial segregation with stationary side-plates and with side-plates moving in different angular directions. |
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| Keywords: | Granular flow Discrete element method Segregation Side-wall shear Rotating drum Mixing |
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