1
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Cole K, Mesa D, van Heerden M, Brito-Parada PR. Effect of Retrofit Design Modifications on the Macroturbulence of a Three-Phase Flotation Tank-Flow Characterization Using Positron Emission Particle Tracking (PEPT). Ind Eng Chem Res 2023; 62:7580-7591. [PMID: 37223719 PMCID: PMC10202364 DOI: 10.1021/acs.iecr.2c04389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 04/18/2023] [Accepted: 04/18/2023] [Indexed: 05/25/2023]
Abstract
Turbulence in stirred tank flotation tanks impacts the bulk transport of particles and has an important role in particle-bubble collisions. These collisions are necessary for attachment, which is the main physicochemical mechanism enabling the separation of valuable minerals from ore in froth flotation. Modifications to the turbulence profile in a flotation tank, therefore, can result in improvements in flotation performance. This work characterized the effect of two retrofit design modifications, a stator system and a horizontal baffle, on the particle dynamics of a laboratory-scale flotation tank. The flow profiles, residence time distributions, and macroturbulent kinetic energy distributions were derived from positron emission particle tracking (PEPT) measurements of tracer particles representing valuable (hydrophobic) mineral particles in flotation. The results show that the use of both retrofit design modifications together improves recovery by increasing the rise velocity of valuable particles and decreasing turbulent kinetic energy in the quiescent zone and at the pulp-froth interface.
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Affiliation(s)
- Katie Cole
- Department
of Physics, University of Cape Town, Rondebosch 7700, South Africa
| | - Diego Mesa
- Advanced
Mineral Processing Research Group, Royal School of Mines, Imperial College London, South Kensington, London SW7 2BX, United Kingdom
| | - Michael van Heerden
- Department
of Physics, University of Cape Town, Rondebosch 7700, South Africa
- iThemba
LABS, Old Faure Road,
Eerste River, Cape Town 7100, South Africa
| | - Pablo R. Brito-Parada
- Advanced
Mineral Processing Research Group, Royal School of Mines, Imperial College London, South Kensington, London SW7 2BX, United Kingdom
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2
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Droplet size distribution in a biphasic liquid reactor for understanding the impact of various dual impeller designs on the morphology of S-PVC. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1252-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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3
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Wu M, Jurtz N, Walle A, Kraume M. Evaluation and application of efficient CFD-based methods for the multi-objective optimization of stirred tanks. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Flamm MH, Kalal Z. Near-wall resolution and wall modeling for lattice Boltzmann simulations of mechanically agitated vessels. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Fahad MK, Prakash R, Majumder SK, Ghosh P. Investigation of the induction time and recovery in a flotation column: A kinetic analysis. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2022.2084629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Musliyar Kurungattil Fahad
- Applied Multiphase Process Research Lab, Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Ritesh Prakash
- Applied Multiphase Process Research Lab, Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon, Republic of Korea
| | - Subrata Kumar Majumder
- Applied Multiphase Process Research Lab, Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, India
| | - Pallab Ghosh
- Applied Multiphase Process Research Lab, Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
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6
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Jia Z, Xu L, Duan X, Mao ZS, Zhang Q, Yang C. CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.05.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Engineering characterization of the novel Bach impeller for bioprocessing applications requiring low power inputs. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117263] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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8
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Haringa C. An analysis of organism lifelines in an industrial bioreactor using Lattice-Boltzmann CFD. Eng Life Sci 2022; 23:e2100159. [PMID: 36619885 PMCID: PMC9815090 DOI: 10.1002/elsc.202100159] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 02/03/2022] [Accepted: 02/24/2022] [Indexed: 01/11/2023] Open
Abstract
Euler-Lagrange CFD simulations, where the biotic phase is represented by computational particles (parcels), provide information on environmental gradients inside bioreactors from the microbial perspective. Such information is highly relevant for reactor scale-down and process optimization. One of the major challenges is the computational intensity of CFD simulations, especially when resolution of dynamics in the flowfield is required. Lattice-Boltzmann large-eddy simulations (LB-LES) form a very promising approach for simulating accurate, dynamic flowfields in stirred reactors, at strongly reduced computation times compared to finite volume approaches. In this work, the performance of LB-LES in resolving substrate gradients in large-scale bioreactors is explored, combined with the inclusion of a Lagrangian biotic phase to provide the microbial perspective. In addition, the hydrodynamic performance of the simulations is confirmed by verification of hydrodynamic characteristics (radial velocity, turbulent kinetic energy, energy dissipation) in the impeller discharge stream of a 29 cm diameter stirred tank. The results are compared with prior finite volume simulation results, both in terms of hydrodynamic and biokinetic observations, and time requirements.
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Affiliation(s)
- Cees Haringa
- Bioprocess EngineeringBiotechnology DepartmentDelft University of TechnologyDelftthe Netherlands
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9
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Yang Y, Zhou Y, Ouyang B, Wu Y, Zhang X, Luo Z. Influence of Thermal Runaway in
Styrene‐Acrylonitrile
Bulk Copolymerization Revealed by Computational Fluid Dynamics Modeling. AIChE J 2022. [DOI: 10.1002/aic.17645] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ya‐Nan Yang
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
| | - Yin‐Ning Zhou
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
| | - Bo Ouyang
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
| | - Yi‐Yang Wu
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
| | - Xi‐Bao Zhang
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
| | - Zheng‐Hong Luo
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University Shanghai China
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10
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Wang H, Duan X, Feng X, Mao ZS, Yang C. Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2021.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Li L, Xu B. CFD simulation of hydrodynamics characteristics in a tank with forward-reverse rotating impeller. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2021.104174] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Mesa D, Cole K, van Heerden MR, Brito-Parada PR. Hydrodynamic characterisation of flotation impeller designs using Positron Emission Particle Tracking (PEPT). Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119316] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Sommer AE, Rox H, Shi P, Eckert K, Rzehak R. Solid-liquid flow in stirred tanks: “CFD-grade” experimental investigation. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116743] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Zhang H, Wang Y, Sayyar A, Wang T. Experimental study on breakup of a single bubble in a stirred tank: Effect of gas density and liquid properties. AIChE J 2021. [DOI: 10.1002/aic.17511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Huahai Zhang
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering Tsinghua University Beijing China
| | - Yuelin Wang
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering Tsinghua University Beijing China
| | - Ali Sayyar
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering Tsinghua University Beijing China
| | - Tiefeng Wang
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering Tsinghua University Beijing China
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15
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Characterization of mixing performance in bioreactors using flow-following sensor devices. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.08.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Wang Y, Hao L, Zhu Z, Xu J, Wei H. CFD research on the influence of geometry characteristic on flow pattern and the transition mechanism in Rushton turbine stirred vessels. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2021. [DOI: 10.1515/ijcre-2021-0041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this paper, the transient MRF approach coupled with the standard k-ε and SST k-ω turbulence models was employed to study the effect of bottom shape, impeller diameter (D
J) and bottom height (H
2) on critical impeller off-bottom clearance (C). It was found the bottom shape and bottom height (H
2) have obvious influence on the flow pattern transition from double-loop to single-loop of RT impeller. The flow pattern transition mechanism was inferred to relate to the relationship between the space required by the lower circulation zone and the actual space. The boundary conditions of critical C were further concluded to help distinguish the flow pattern and receive the expected one in the stirred vessel design.
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Affiliation(s)
- Yinghui Wang
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350 , China
| | - Lin Hao
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350 , China
| | - Zhenxing Zhu
- Department of Process Engineering , Sinopec Research Institute of Petroleum Processing , Beijing 100083 , China
| | - Jinjie Xu
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350 , China
| | - Hongyuan Wei
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350 , China
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17
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Effect of multiple impeller designs and configurations on the droplet size and uniformity in a 100 L scale stirred tank. KOREAN J CHEM ENG 2021. [DOI: 10.1007/s11814-021-0803-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Płusa T, Talaga J, Duda A, Duda P. Modeling mixing dynamics in uncovered baffled and unbaffled stirred tanks. AIChE J 2021. [DOI: 10.1002/aic.17322] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tomasz Płusa
- Faculty of Mechanical Engineering, Institute of Thermal and Process Engineering Cracow University of Technology Kraków Poland
| | - Jan Talaga
- Faculty of Mechanical Engineering, Institute of Thermal and Process Engineering Cracow University of Technology Kraków Poland
| | - Andrzej Duda
- Faculty of Mechanical Engineering, Institute of Thermal and Process Engineering Cracow University of Technology Kraków Poland
| | - Piotr Duda
- Faculty of Mechanical Engineering, Institute of Thermal and Process Engineering Cracow University of Technology Kraków Poland
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19
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Fan Y, Sun J, Jin J, Zhang H, Chen W. The effect of baffle on flow structures and dynamics stirred by pitch blade turbine. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.01.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Wang G, Yang F, Wu K, Ma Y, Peng C, Liu T, Wang LP. Estimation of the dissipation rate of turbulent kinetic energy: A review. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116133] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Cheng D, Sheibat‐Othman N, McKenna TFL. Modelling study of emulsion latex coagulation processes in coagulators. CAN J CHEM ENG 2020. [DOI: 10.1002/cjce.23851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dang Cheng
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)‐LCPP group Villeurbanne France
| | - Nida Sheibat‐Othman
- University of Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007 Villeurbanne France
| | - Timothy F. L. McKenna
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)‐LCPP group Villeurbanne France
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22
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Samaras JJ, Micheletti M, Ducci A. Flow, suspension, and mixing dynamics in
DASGIP
bioreactors: Part 1. AIChE J 2020. [DOI: 10.1002/aic.17014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jasmin J. Samaras
- Department of Biochemical Engineering University College London London UK
| | - Martina Micheletti
- Department of Biochemical Engineering University College London London UK
| | - Andrea Ducci
- Department of Mechanical Engineering University College London London UK
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23
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Jia H, Wang F, Wu J, Tan X, Li M. CFD Research on the Influence of 45° Disk Turbine Agitator Blade Diameter on the Solid–Liquid Mixing Characteristics of the Cone-Bottom Stirred Tank. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2020. [DOI: 10.1007/s13369-020-04528-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Zhu Z, Qin B, Li S, Liu Y, Li X, Cui P, Wang Y, Gao J. Multi-dimensional analysis of turbulence models for immiscible liquid-liquid mixing in stirred tank based on numerical simulation. SEP SCI TECHNOL 2020. [DOI: 10.1080/01496395.2020.1715436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Zhaoyou Zhu
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
- Shandong Collaborative Innovation Center of Eco-Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Bin Qin
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Shuhua Li
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Yigang Liu
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Xin Li
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Peizhe Cui
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Yinglong Wang
- College of Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
- Shandong Collaborative Innovation Center of Eco-Chemical Engineering, Qingdao University of Science and Technology , Qingdao, China
| | - Jun Gao
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology , Qingdao, China
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25
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Effect of baffles shape on the flow patterns and power consumption in stirred vessels. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1550-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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26
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Márquez-Baños VE, De La Concha-Gómez AD, Valencia-López JJ, López-Yáñez A, Ramírez-Muñoz J. Shear rate and direct numerical calculation of the Metzner-Otto constant for a pitched blade turbine. J FOOD ENG 2019. [DOI: 10.1016/j.jfoodeng.2019.03.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Wang H, Li X, Mao Z, Yang C. New invasive image velocimetry applicable to dense multiphase flows and its application in solid–liquid suspensions. AIChE J 2019. [DOI: 10.1002/aic.16668] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Haoliang Wang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process EngineeringChinese Academy of Sciences Beijing China
- School of Chemical EngineeringUniversity of Chinese Academy of Sciences Beijing China
| | - Xiangyang Li
- CAS Key Laboratory of Green Process and Engineering, Institute of Process EngineeringChinese Academy of Sciences Beijing China
| | - Zai‐Sha Mao
- CAS Key Laboratory of Green Process and Engineering, Institute of Process EngineeringChinese Academy of Sciences Beijing China
| | - Chao Yang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process EngineeringChinese Academy of Sciences Beijing China
- School of Chemical EngineeringUniversity of Chinese Academy of Sciences Beijing China
- Green Manufacture InstituteChinese Academy of Sciences Beijing China
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28
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Bliatsiou C, Malik A, Böhm L, Kraume M. Influence of Impeller Geometry on Hydromechanical Stress in Stirred Liquid/Liquid Dispersions. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03654] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chrysoula Bliatsiou
- Chair of Chemical and Process Engineering, Technische Universität Berlin, FH6-1, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Alexander Malik
- Chair of Chemical and Process Engineering, Technische Universität Berlin, FH6-1, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Lutz Böhm
- Chair of Chemical and Process Engineering, Technische Universität Berlin, FH6-1, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Matthias Kraume
- Chair of Chemical and Process Engineering, Technische Universität Berlin, FH6-1, Straße des 17. Juni 135, 10623 Berlin, Germany
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29
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The Process of the Intensification of Coal Fly Ash Flotation Using a Stirred Tank. MINERALS 2018. [DOI: 10.3390/min8120597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pulp preconditioning using a stirred tank as a pretreatment process is vital to the flotation system, which can be used to improve the flotation efficiency of mineral particles. The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particles and flotation reagents to improve the flotation efficiency in the presence of the preconditioning. In this paper, the effect of the conditioning speed on the coal fly ash flotation was investigated using numerical simulations and conditioning-flotation tests. The large eddy simulation coupled with the Smagorinsky-Lilly subgrid model was employed to simulate the turbulence flow field in the stirred tank, which was equipped with a six blade Rushton turbine. The impeller rotation was modelled using the sliding mesh. The simulation results showed that the large eddy simulation (LES) well matched the previous experimental data. The turbulence characteristics, such as the mean velocity, turbulent kinetic energy, power consumption and instantaneous structures of trailing vortices were analysed in detail. The turbulent length scale (η) decreased as the rotation speed increased, and the minimum value of η was almost unchanged when the rotation speed was more than 1200 rpm. The conditioning-flotation tests of coal fly ash were conducted using different conditioning speeds. The results showed that the removal of unburned carbon was greatly improved due to the strengthened turbulence in the stirred tank, and the optimal results were obtained with an LOI of 3.32%, a yield of 78.69% and an RUC of 80.89% when the conditioning speed was 1200 rpm.
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30
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Tamburini A, Gagliano G, Micale G, Brucato A, Scargiali F, Ciofalo M. Direct numerical simulations of creeping to early turbulent flow in unbaffled and baffled stirred tanks. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2018.07.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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31
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32
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Sanapala V, Das R, Ravisankar A. Numerical investigation of jet agitation in a nuclear liquid waste storage tank. PROGRESS IN NUCLEAR ENERGY 2018. [DOI: 10.1016/j.pnucene.2018.08.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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33
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34
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Liang Y, Shi D, Xu B, Cai Z, Gao Z. Turbulent flow field in a stirred vessel agitated by an Impeller with flexible blades. AIChE J 2018. [DOI: 10.1002/aic.16353] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yangyang Liang
- State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Daien Shi
- Mechanical Engineering School; Yancheng Institute of Technology; Yancheng 224051 China
| | - Bohang Xu
- State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Ziqi Cai
- State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Zhengming Gao
- State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering; Beijing University of Chemical Technology; Beijing 100029 China
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35
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Liangchao L, Ning C, Kefeng X, Beiping X. A Comparative CFD Study on Gas-Liquid Dispersion in A Stirred Tank with Low and High Gas Loadings. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2018. [DOI: 10.1515/ijcre-2017-0147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The computational fluid dynamics (CFD) combined with a population balance model (PBM) was applied to simulate gas-liquid dispersion in a stirred tank with low and high gas loadings. The model predictions were validated by using the data in the literature. The simulation results show that the flow patterns and gas dispersion characteristics are very different in the stirred tank for low and high gas loadings. A typical two-loop flow pattern forms as that in single-phase stirred tank for low gas loadings, while a triple-loop flow pattern, with two recirculation loops above and one below the impeller is found in the tank for high gas loadings. Shaft power input of impeller agitation plays a major role for gas dispersion with low gas loadings. For high gas loadings, the potential energy due to gas sparging has significant effect on gas dispersion and can not be neglected. Compared to low gas loading, high gas loading causes average gas holdup increased in the stirred tank, while relative local gas holdup in the lower circulation-loop region and near-wall region reduced. The ability of impeller agitation for gas dispersion reduces with high gas loadings, and mean bubble size becomes larger and the volume-averaged bubble size distribution is wider.
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36
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Inter-compartment interaction in multi-impeller mixing: Part I. Experiments and multiple reference frame CFD. Chem Eng Res Des 2018. [DOI: 10.1016/j.cherd.2018.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Haringa C, Vandewijer R, Mudde RF. Inter-compartment interaction in multi-impeller mixing. Part II. Experiments, sliding mesh and large Eddy simulations. Chem Eng Res Des 2018. [DOI: 10.1016/j.cherd.2018.06.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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de Lamotte A, Delafosse A, Calvo S, Toye D. Analysis of PIV measurements using modal decomposition techniques, POD and DMD, to study flow structures and their dynamics within a stirred-tank reactor. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.12.047] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Liu Q, Su Y, Luo ZH. Numerical simulations of hydrodynamics and concentration distribution in a stirred tank during startup stage for producing phenylboronic acid ester. ASIA-PAC J CHEM ENG 2018. [DOI: 10.1002/apj.2172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Qi Liu
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; Shanghai 200240 P. R. China
| | - Yuanhai Su
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; Shanghai 200240 P. R. China
| | - Zheng-Hong Luo
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; Shanghai 200240 P. R. China
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Pan X, Ding L, Luo P, Wu H, Zhou Z, Zhang Z. LES and PIV investigation of turbulent characteristics in a vessel stirred by a novel long-short blades agitator. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.10.054] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Darabi H, Koleini SMJ, Deglon D, Rezai B, Abdollahy M. Particle Image Velocimetry Study of the Turbulence Characteristics in an Aerated Flotation Cell. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b03648] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hossna Darabi
- Department
of Mineral Processing, Tarbiat Modares University, Tehran, 14115-11, Iran
| | - S. M. Javad Koleini
- Department
of Mineral Processing, Tarbiat Modares University, Tehran, 14115-11, Iran
| | - David Deglon
- Mineral
Processing Research Unit, Department of Chemical Engineering, University of Cape Town, Cape Town, 7700, South Africa
| | - Bahram Rezai
- Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, 159163-4311, Iran
| | - Mahmoud Abdollahy
- Department
of Mineral Processing, Tarbiat Modares University, Tehran, 14115-11, Iran
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Komrakova A, Liu Z, Machado M, Kresta S. Development of a zone flow model for the confined impeller stirred tank (CIST) based on mean velocity and turbulence measurements. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.07.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lane GL. Improving the accuracy of CFD predictions of turbulence in a tank stirred by a hydrofoil impeller. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.03.061] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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Wang C, Xu Y, Wu Y, An Z. PIV investigation of the flow features of double and single 45° up-pumping pitched blade turbines in a square tank. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.22952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Cunteng Wang
- School of Municipal and Environmental Engineering; Harbin Institute of Technology; Harbin Heilongjiang Province China
| | - Ying Xu
- School of Energy and Architecture; Harbin University of Commerce; Harbin Heilongjiang Province China
- School of Civil, Environmental and Mining Engineering; The University of Adelaide; Adelaide, 5000 Australia
| | - Yuebin Wu
- School of Municipal and Environmental Engineering; Harbin Institute of Technology; Harbin Heilongjiang Province China
| | - Zicheng An
- School of Municipal and Environmental Engineering; Harbin Institute of Technology; Harbin Heilongjiang Province China
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Zhang Y, Pan X, Wang Y, Luo P, Wu H. Numerical and experimental investigation on surface air entrainment mechanisms of a novel long-short blades agitator. AIChE J 2017. [DOI: 10.1002/aic.15865] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yueqiao Zhang
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - Xiang Pan
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - Yaohua Wang
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - Peicheng Luo
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - Hua Wu
- Institute for Chemical and Bioengineering, Dept. of Chemistry and Applied Biosciences; ETH Zurich; Zurich 8093 Switzerland
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47
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Šulc R, Ditl P. Local turbulent energy dissipation rate in an agitated vessel: New approach to dimensionless definition. THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2017. [DOI: 10.1134/s0040579517020105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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48
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You X, Li L, Liu J, Wu L, He M, Lyu X. Investigation of particle collection and flotation kinetics within the Jameson cell downcomer. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.01.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cortada-Garcia M, Dore V, Mazzei L, Angeli P. Experimental and CFD studies of power consumption in the agitation of highly viscous shear thinning fluids. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.01.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Li LC, Xu B. CFD simulation of floating particles suspension in a stirred tank. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0128-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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