Avalanching flow of cohesive powders |
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| Authors: | Albert W Alexander Bodhisattwa Chaudhuri AbdulMobeen Faqih Clive Davies |
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| Affiliation: | a Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway 08854, United States
b Institute of Technology and Engineering, Massey University, Palmerston North, New Zealand |
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| Abstract: | The flow dynamics of cohesive powders is investigated in rotating cylinders with an L : R ratio of 3 : 1 using experiments and DEM simulations. Flow onset and steady-state behavior are compared for free-flowing (cohesionless) dry glass beads, wet glass beads, and “dry” cohesive powders (lactose, microcrystalline cellulose). The avalanching dynamics of powders is substantially different from those observed for free-flowing or wet-cohesive glass beads. Dry cohesive powders exhibit history-dependent flow dynamics, significant dilation, aperiodic avalanche frequencies, and variable avalanche size. These behaviors also provide a route for effective characterization of cohesive forces under dilated conditions characteristic of unconfined flows. |
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| Keywords: | Granular flow Cohesion Avalanches Discrete element method |
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