TY - GEN
T1 - Discrete element modelling of grain size segregation in bi-disperse granular flows down chute
AU - Jing, Lu
AU - Kwok, Fiona C.Y.
AU - Leung, Andy Y.F.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2015
Y1 - 2015
N2 - Three-dimensional DEM simulations of size segregation in granular flows down chute are presented. Different cubic bi-disperse samples are generated by pluviation, on the rough base formed by randomly placed particles. Periodic boundaries are applied to the How direction and the two sides. Parametric studies involving slope angle, width, volume fraction, and the coefficient of friction are systemically performed. In all presented cases, the steady, fully developed (SFD) state is achieved, where the kinetic energy and fractional volume distribution remain constant. From the macroscopic view, segregations are completed prior to the SFD state with slightly different extents and a thick layer of coarse grains appears on the top of the flow. The profiles of volume fraction are calculated and presented by shear layers. In addition, the trajectories of individual particles are tracked and analysed, showing clearly the contact conditions and shear history experienced by individual particles. It is found that the connectivity of small particles is generally at a lower level than that of the large ones, indicating a high probability of small particles dropping into voids under gravity. On the other hand, the large particles experience a significant increase of connectivity as they migrate through the layer of small particles.
AB - Three-dimensional DEM simulations of size segregation in granular flows down chute are presented. Different cubic bi-disperse samples are generated by pluviation, on the rough base formed by randomly placed particles. Periodic boundaries are applied to the How direction and the two sides. Parametric studies involving slope angle, width, volume fraction, and the coefficient of friction are systemically performed. In all presented cases, the steady, fully developed (SFD) state is achieved, where the kinetic energy and fractional volume distribution remain constant. From the macroscopic view, segregations are completed prior to the SFD state with slightly different extents and a thick layer of coarse grains appears on the top of the flow. The profiles of volume fraction are calculated and presented by shear layers. In addition, the trajectories of individual particles are tracked and analysed, showing clearly the contact conditions and shear history experienced by individual particles. It is found that the connectivity of small particles is generally at a lower level than that of the large ones, indicating a high probability of small particles dropping into voids under gravity. On the other hand, the large particles experience a significant increase of connectivity as they migrate through the layer of small particles.
KW - DEM
KW - Granular flow
KW - Segregation
UR - https://www.scopus.com/pages/publications/84960414602
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84960414602&origin=recordpage
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9788494424472
T3 - Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
SP - 474
EP - 484
BT - Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
PB - International Center for Numerical Methods in Engineering
T2 - 4th International Conference on Particle-Based Methods, PARTICLES 2015
Y2 - 28 September 2015 through 30 September 2015
ER -