Article (Scientific journals)
Numerical study of particle mixing in a lab-scale screw mixer using the discrete element metod
Qi, Fenglei; Heindel, Theodore; Wright, Mark
2017In Powder Technology, 308, p. 334-345
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Keywords :
Discrete element method; Double screw mixer; Mixing index; Multicomponent mixture; Particle mixing
Abstract :
[en] This study employs the discrete element method (DEM) to simulate particulate flow and investigate mixing performance of a lab-scale double screw mixer. The simulation employs polydispersed biomass and glass bead particles based on experiments conducted in previous studies. Visual examination of particle distribution and statistical analysis of particle residence times of experimental data served as model validation. Statistical analysis indicates a maximum 9.8% difference between the experimental and simulated biomass particle mean residence time, and visual observations suggest the simulation captures the particle mixing trends observed in the experiments. Results indicate that the particle mean mixing time, non-dimensionalized by ideal flow time in the plug flow reactor, varies between 1.008 and 1.172, and it approaches 1 with increasing biomass feed rate. The mixing index profile in the axial direction shows a mixing-demixing-mixing oscillation pattern. Increasing screw pitch length is detrimental to mixing performance; decreasing the solid particle feed rate reduces the mixing degree; and increasing the biomass to glass bead size ratio decreases mixing performance. A comparison of a binary, single-sized biomass and glass particles mixture to a multicomponent mixture indicates that the binary system has similar mixing pattern as a multicomponent system. These findings demonstrate that DEM is a valuable tool for the design and simulation of double screw mixing systems.
Disciplines :
Mechanical engineering
Author, co-author :
Qi, Fenglei ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Heindel, Theodore;  Iowa State University > Department of Mechanical Engineering
Wright, Mark;  Iowa State University > Department of Mechanical Engineering
External co-authors :
yes
Language :
English
Title :
Numerical study of particle mixing in a lab-scale screw mixer using the discrete element metod
Publication date :
15 February 2017
Journal title :
Powder Technology
ISSN :
0032-5910
eISSN :
1873-328X
Publisher :
Elsevier Science, Lausanne, Switzerland
Volume :
308
Pages :
334-345
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Computational Sciences
Available on ORBilu :
since 23 November 2017

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