camera iphone 8 plus apk Segregation during Transport of Granular Material

Bernhard Peters,
Université du Luxembourg, Faculté des Sciences, de la Technologie et de la Communication, Campus Kirchberg, Luxembourg

Transport of granular materials exists in a lot of industrial processes. Particle segregation arises in transport processes due to differences in particle properties such as particle size, and consequently affects the received quality of the granular matter. However, our understanding of particle segregation and its underlying physics is limited and more research effort is required. Experimental studies [1, 2] usually adopt tracer particles to obtain internal flow information and to unveil particle kinematic behaviour. The particle scale information obtained from this approach is usually very limited for quantitatively assessing particle mixing, and additional numerical model was introduced for explaining particle mixing mechanisms as shown in [1]. As an alternative, Discrete Element Method (DEM) simulations could reproduce particle flows in all kinds of systems, and provide adequate particle scale information for assessing particle mixing and segregation. In this research, the DEM approach is adopted to investigate particle size segregation in a system of two hoppers connected by a chute.

To evaluate particle size segregation in the system, a particle transport process is designed. At initial state, the top hopper contains randomly positioned particles of three different sizes. In phase one, the exit of top hopper is opened and the particles are discharged from the top hopper into the bottom one over a chute under the influence of gravity. In phase two, the particles are discharged from the bottom hopper onto the ground. In order to assess particle size evolution during the filling and the discharge of the bottom hopper, a harmonic diameter Dh(t) is defined.

Results show that size segregation occurs on the chute by comparing the initial particle state on the chute with the particle state near the exit of the chute. It is observed that smaller particles fall through the gaps formed by larger particles and the larger particles flow on top of the smaller particles near the exit of the chute. During the discharge of the bottom hopper, a significant size segregation is indicated from the evolution of the harmonic diameter. At first, the value of the harmonic diameter increases with time until a maximum value is reached. A drop of the harmonic diameter is followed, which indicates the start of discharge of particles sliding on the side wall of the hopper, and finally the value increases again. At the end of the discharge process, a pile is formed on the ground with an angle of repose measured around 39o which corresponds to a friction coefficient of 0.85.

References
[1] Lim, C. N., Goh, Y. R., Nasserzadeh, V., Swithenbank, J., and Riccius, O. (2001). The modelling of solid mixing in municipal waste incinerators. Powder technology, 114(1), 89-95.
[2] Hassanpour, A., Tan, H., Bayly, A., Gopalkrishnan, P., Ng, B., and Ghadiri, M. (2011). Analysis of particle motion in a paddle mixer using Discrete Element Method (DEM). Powder Technology, 206(1), 189-194.

camera iphone 8 plus apk Segregation during Transport of Granular Material
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Science & Technology	Upload TimePublished on 7 Jun 2017

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