Enhancing mixing of cohesive particles by baffles in a rotary drum--颗粒学报PARTICUOLOGY

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 (t_R) and mixing entropy were used to characterize the mixing behavior. The results showed that increasing particle cohesiveness increases t_R. 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

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