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DEM study of segregation degree and velocity of binary granular mixtures subject to vibration

Authors :
Jinpeng Qiao
Yuemin Zhao
Chenlong Duan
Kejun Dong
Haishen Jiang
Haiping Zhu
Wang Weinan
Source :
Powder Technology. 382:107-117
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

This paper presents a study on the Brazil-nut segregation of binary granular mixtures under vibration by the discrete element method. The ascending velocity of large particles (Va) and the overall segregation degree (Dsep) are correlated to the vibration velocity amplitude (Vb) and the dimensionless frequency (fd). Both Dsep and the average Va increase linearly with Vb under a given fd, while the coefficient shows a critical change at fd =1. Va conforms to a single-peak distribution, and the shape parameters of the distribution converge after Vb > 1.7. Both Va and Dsep can be correlated to (A/ds)‧fd0.5 universally, where A is amplitude and ds is the small particles size. The increase of the volume fraction of large particles leads to the increase of Dsep and Va, which is probably linked with the increase in granular temperature and the difference between the vibration patterns of large and small particles.

Details

ISSN :
00325910
Volume :
382
Database :
OpenAIRE
Journal :
Powder Technology
Accession number :
edsair.doi...........45c7ccfccf65a29f4da3e79fa18cede4