Volume 25
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Zhou, Z., Li, J., Zhou, J., Li, S., & Feng, J. (2016). Enhancing mixing of cohesive particles by baffles in a rotary drum. Particuology, 25, 104-110. https://doi.org/10.1016/j.partic.2015.03.008
Enhancing mixing of cohesive particles by baffles in a rotary drum
Zhixing Zhou a b c, Jihong Li a b c, Jingzhi Zhou d, Shizhong Li a b c *, Junxiao Feng d
a Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
b Beijing Engineering Research Centre of Biofuels, China
c MOST-USDA Joint Research Center for Biofuels Beijing 100084, China
d Department of Thermal Science and Energy Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100081, China
10.1016/j.partic.2015.03.008
Volume 25, April 2016, Pages 104-110
Received 23 August 2014, Revised 14 January 2015, Accepted 4 March 2015, Available online 29 August 2015, Version of Record 18 February 2016.
E-mail: szli@tsinghua.edu.cn

Highlights

• Transverse mixing of cohesive particles in rotating drum was investigated.

• Cohesion within a certain range impedes transverse mixing in a rotary drum.

• Enhancement of mixing rate by baffles was better for high-cohesive particles.


Abstract

A soft-sphere discrete cohesive powder model was used to simulate the transverse mixing of particles in a rotary drum. Using this model, the effect of cohesion strength and baffle length was investigated. Mixing time (tR) and mixing entropy were used to characterize the mixing behavior. The results showed that increasing particle cohesiveness increases tR. Baffles enhanced transverse mixing, especially for high-cohesive particles. Moreover, the baffle length played a significant role on mixing. An optimized length of 0.50 (L/R) enhances transverse mixing for high-cohesive particles. Further increases in baffle length only decreases the mixing rate by impeding the surface flow layer. In contrast to high-cohesive particles, low-cohesive particles needed much shorter baffles.

Graphical abstract
Keywords
Cohesive particles; Mixing; Baffles; Rotary drum