A Numerical Study on Convection of Particles in a Bin during Vertical Vibration.

概要

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'Granular convection' is a well-known phenomenon when particles in a bin are vertically vibrated. However, its actual mechanical movement is not fully understood. An experiment using the magnetic resonance image (MRI) by Ehrichs et al, clearly reveals the behavior of particles. In this study, the experiment is simulated using a 3-dimensional distinct element code. The analytical result, shown as a central section of the particle layers, is identical to the experimental one. A comparison between 0-4 cycles and 100-104 cycles reveals a similar behavior. This demonstrates that convection occurs as a repetition of 1 cycle. Detailed analysis reveals the behavior of the individual particles during convection. The driving force of the convection appears to be the different movement of the inner and outer particles. This mechanism which was proposed by Taguchi is proved by this analysis.
粉体工学会の論文