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Zhou Y, Su H, Yang W, Li Y, Gong T, He D. Particle flow characteristics in the pipeline of a nonmetallic ore powder air classifier using a DPD-DEM coupled method. PARTICULATE SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1080/02726351.2022.2151536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Affiliation(s)
- Youhang Zhou
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
- Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan, China
| | - Hao Su
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
| | - Wenjia Yang
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
| | - Yuze Li
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
| | - Tianyu Gong
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
| | - Dongke He
- College of Mechanical Engineering, Xiangtan University, Xiangtan, China
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Residence Time Distribution of Non-Spherical Particles in a Continuous Rotary Drum. Processes (Basel) 2022. [DOI: 10.3390/pr10061069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The motion of non-spherical particles with sharp edges, as they are commonly involved in practice, was characterized by residence time distribution (RTD) measurement in a continuous drum. Particles with two sizes, 6 and 10 mm, and two densities, 750 and 2085 kg/m3, were used in the experiments. The effects of rotation speed (3–11 rpm), incline angle (2–4°), feed rate, and mixture composition were investigated and compared to the results of other researchers on particles without sharp edges. We also fitted the RTD with an axial dispersion model to obtain a better insight into the flow behavior. MRT of non-spherical particles with sharp edges depends on ω−α similar to other shapes, while the value of alpha is higher for particles with sharp edges (0.9 < α < 1.24), especially at high incline angles. The MRT depends on incline angle, β−b, where b varies between 0.81 (at low ω) and 1.34 (at high ω), while it is close to 1 for other shapes. Feed rate has a slight effect on the MRT of particles with sharp edges and the effect of particle size diminishes when rotation speed increases. The MRT linearly increases with volume fraction of light particles in a mixture of light and heavy particles (from pure heavy to pure light particles).
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DEM investigation of particle flow in a vertical rice mill: Influence of particle shape and rotation speed. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.117105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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He S, Gan J, Pinson D, Yu A, Zhou Z. Particle shape-induced axial segregation of binary mixtures of spheres and ellipsoids in a rotating drum. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116491] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Sebastian Escotet-Espinoza M, Foster CJ, Ierapetritou M. Discrete Element Modeling (DEM) for mixing of cohesive solids in rotating cylinders. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.05.024] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Yang S, Luo K, Chew JW. Three-dimensional axial dispersion dynamics of granular flow in the rolling-regime rotating drum. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.03.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Yang S, Zhang L, Luo K, Chew JW. DEM investigation of the axial dispersion behavior of a binary mixture in the rotating drum. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.02.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Simultaneous Production of Amyloglucosidase and Exo-Polygalacturonase by Aspergillus niger in a Rotating Drum Reactor. Appl Biochem Biotechnol 2016; 181:627-637. [DOI: 10.1007/s12010-016-2237-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 09/02/2016] [Indexed: 10/20/2022]
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10
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Han Y, Jia F, Zeng Y, Jiang L, Zhang Y, Cao B. Effects of rotation speed and outlet opening on particle flow in a vertical rice mill. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.04.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Yang S, Cahyadi A, Wang J, Chew JW. DEM study of granular flow characteristics in the active and passive regions of a three-dimensional rotating drum. AIChE J 2016. [DOI: 10.1002/aic.15315] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shiliang Yang
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Andy Cahyadi
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Jingwei Wang
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University; Singapore 637141 Singapore
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University; Singapore 637141 Singapore
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Ghorbanian M, Russ DC, Berson RE. Mixing analysis of PCS slurries in a horizontal scraped surface bioreactor. Bioprocess Biosyst Eng 2014; 37:2113-9. [DOI: 10.1007/s00449-014-1189-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 04/06/2014] [Indexed: 11/28/2022]
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Alizadeh E, Bertrand F, Chaouki J. Comparison of DEM results and Lagrangian experimental data for the flow and mixing of granules in a rotating drum. AIChE J 2013. [DOI: 10.1002/aic.14259] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ebrahim Alizadeh
- Dept. of Chemical Engineering; École Polytechnique de Montréal; C.P. 6079 succ. Centre-Ville Montréal QC H3C 3A7 Canada
| | - Francois Bertrand
- Dept. of Chemical Engineering; École Polytechnique de Montréal; C.P. 6079 succ. Centre-Ville Montréal QC H3C 3A7 Canada
| | - Jamal Chaouki
- Dept. of Chemical Engineering; École Polytechnique de Montréal; C.P. 6079 succ. Centre-Ville Montréal QC H3C 3A7 Canada
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Wang Z, Wen S, Zhang Q, Liu G, Wu X, Cong W. Power Consumption of Liquid and Liquid/Solid Systems in a Rotating-Drum Bioreactor. Chem Eng Technol 2013. [DOI: 10.1002/ceat.201200523] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Third JR, Müller CR. Is axial dispersion within rotating cylinders governed by the Froude number? Phys Rev E 2013; 86:061314. [PMID: 23367939 DOI: 10.1103/physreve.86.061314] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Indexed: 11/07/2022]
Abstract
Axial dispersion rates of particles within horizontal rotating cylinders have been calculated for a decade of cylinder diameters. Throughout the range studied the rate of axial dispersion was found to be independent of the cylinder diameter. This phenomenon has been investigated further by spatially resolving the local contribution to the axial dispersion coefficient. This analysis demonstrates that, although the highest rates of axial dispersion occur at the free surface of the bed, there is a significant contribution to axial dispersion throughout the flowing region of the bed. Finally, based on an analogy with a Galton board, a linear relationship is proposed between the local rate of axial dispersion within a horizontal rotating cylinder and the product of the local particle concentration and the local shear rate in a plane perpendicular to the cylinder axis.
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Affiliation(s)
- J R Third
- Department of Mechanical and Process Engineering, Institute of Energy Technology, ETH Zürich, Leonhardstrasse 27, 8092 Zürich, Switzerland.
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Resolving a paradox of anomalous scalings in the diffusion of granular materials. Proc Natl Acad Sci U S A 2012; 109:16012-7. [PMID: 22992653 DOI: 10.1073/pnas.1211110109] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Granular materials do not perform Brownian motion, yet diffusion can be observed in such systems when agitation causes inelastic collisions between particles. It has been suggested that axial diffusion of granular matter in a rotating drum might be "anomalous" in the sense that the mean squared displacement of particles follows a power law in time with exponent less than unity. Further numerical and experimental studies have been unable to definitively confirm or disprove this observation. We show two possible resolutions to this apparent paradox without the need to appeal to anomalous diffusion. First, we consider the evolution of arbitrary (non-point-source) initial data towards the self-similar intermediate asymptotics of diffusion by deriving an analytical expression for the instantaneous collapse exponent of the macroscopic concentration profiles. Second, we account for the concentration-dependent diffusivity in bidisperse mixtures, and we give an asymptotic argument for the self-similar behavior of such a diffusion process, for which an exact self-similar analytical solution does not exist. The theoretical arguments are verified through numerical simulations of the governing partial differential equations, showing that concentration-dependent diffusivity leads to two intermediate asymptotic regimes: one with an anomalous scaling that matches the experimental observations for naturally polydisperse granular materials, and another with a "normal" diffusive scaling (consistent with a "normal" random walk) at even longer times.
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Critical assessment of two approaches for evaluating contacts between super-quadric shaped particles in DEM simulations. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2012.05.041] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Third JR, Scott DM, Müller CR. Axial transport within bidisperse granular media in horizontal rotating cylinders. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 84:041301. [PMID: 22181129 DOI: 10.1103/physreve.84.041301] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 06/07/2011] [Indexed: 05/31/2023]
Abstract
The discrete element method has been used to examine axial dispersion within rotating cylinders containing two sizes of particle. Two bed configurations are considered: initially segregated, which consists of a pulse (narrow axial band) of small particles within a bed of large particles, and initially mixed, in which the cylinder is loaded with a homogeneous mixture of the two particle sizes. The dispersion of the small particles within initially segregated beds is found to depend strongly on the initial length of the pulse of small particles. Initially mixed beds are found to undergo a transient period in which the small particles disperse rapidly. Following this transient, axial dispersion of both particles sizes is found to follow Fick's second law, in that the mean squared deviation of the axial position of the particles is proportional to time. Axial dispersion coefficients have been calculated for initially mixed beds that have reached steady state; the axial dispersion coefficients of both particle sizes decrease as the volume fraction of small particles is increased.
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Affiliation(s)
- J R Third
- Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 27, CH-8092 Zürich, Switzerland.
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