Computational and experimental investigation of laminar flow mixing system in a pitched-blade turbine stirred tank
Keywords:
mixing, laminar flow, PBT impeller, mixture homogeneity, CFDAbstract
The flow distribution and mixing performance of the laminar flow in the PBT impeller-stirred tank were investigated in this study. The variation along with mixing time of the flow distribution and concentration at the selected positions was visualized by means of the CFD and experiment methods. The CFD simulations results had a good agreement with the experimental results. In order to minish the Segregated Regions, the PBT impeller was optimally designed by means of orthogonal factorial experiment with selecting the θ99 mixing time as evaluation criteria. With the aim to increase the mixing efficiency, the optimal design results were obtained with the geometrical parameters of impeller diameter of 0.084 m, discharge angle of 45º, blade width of 0.018 m, and clearance of 0.05 m, and the mixing time of the optimal impeller-stirred flow was about 180 s, so this optimal design PBT impeller is more proper for the agricultural industries. Keywords: mixing, laminar flow, PBT impeller, mixture homogeneity, CFD DOI: 10.25165/j.ijabe.20181104.2729 Citation: Cui Y Y, Zhang H B, Li X W, Yang M J, Guan Z L. Computational and experimental investigation of laminar flow mixing system in a pitched-blade turbine stirred tank. Int J Agric & Biol Eng, 2018; 11(4): 111-117.References
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[2] Brun T, Rabuske J E, Todero I, Almeida T C, Junior J J D, Ariotti G, et al. Production of bioherbicide by Phoma sp in a stirred-tank bioreactor. 3 Biotech, 2016; 6: 230.
[3] Jitrwung R, Yargeau V. Biohydrogen and Bioethanol Production from Biodiesel-Based Glycerol by Enterobacter aerogenes in a Continuous Stir Tank Reactor. International Journal of Molecular Sciences, 2015; 16(5): 10650–10664.
[4] TAKAHASHI K, MOTODA M. Chaotic mixing created by object inserted in a vessel agitated by an impeller. Chemical Engineering Research & Design, 2009; 87(4A): 386–390.
[5] Xiao X, Yu L, Xie F, Bao X, Liu H, Ji Z, et al. One-step method to prepare starch-based superabsorbent polymer for slow release of fertilizer. Chemical Engineering Journal, 2017; 309: 607–616.
[6] Lamberto D J, Muzzio F J, Swanson P D. Using time-dependent RPM to enhance mixing in stirred vessels. Chemical Engineering Science, 1996; 51(5): 733–741.
[7] Dong L, Johansen S, Engh T. Flow induced by an impeller in an unbaffled tank—I. Experimental. Chemical Engineering Science, 1994; 49(4): 549–60.
[8] Zalc J M, Szalai E S, Alvarez M M, Muzzio F J. Using CFD to understand chaotic mixing in laminar stirred tanks. Aiche Journal, 2002; 48(10): 2124–2134.
[9] Kamla Y, Bouzit M, Hadjeb A, Arab I M, Beloudane M. CFD study of the effect of baffles on the energy consumption and the flow structure in a vessel stirred by a Rushton turbine. Mechanika, 2016; 3: 190–197.
[10] Hashemi N, Ein-Mozaffari F, Upreti S R, Hwang D K. Analysis of power consumption and gas holdup distribution for an aerated reactor equipped with a coaxial mixer: Novel correlations for the gas flow number and gassed power. Chemical Engineering Science, 2016; 151: 25–35.
[11] Zadghaffari R, Moghaddas J S, Revstedt J. Large-eddy simulation of turbulent flow in a stirred tank driven by a Rushton turbine. Computers & Fluids, 2010: 39(7): 1183–1190.
[12] Montante G, Micale G, Magelli F, Brucato A. Experiments and CFD Predictions of Solid Particle Distribution in a Vessel Agitated with Four Pitched Blade Turbines. Chemical Engineering Research and Design, 2001; 79(8): 1005–1010.
[13] Zhang J, Li X, He R, Liang J. Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system. Advances in Mechanical Engineering, 2015; 7(7): 1–12.
[14] Takahashi K, Sugo Y, Takahata Y, Sekine H, Nakamura M. Laminar mixing in stirred tank agitated by an impeller inclined. International Journal of Chemical Engineering, 2012; 2012: 1–10.
[15] Qiao S, Wang R, Yan Y, Yang X X. Computational fluid dynamics analysis to effects of geometrical design and physical property on complete suspension of floating solids in stirred tanks. Asia-Pacific Journal of Chemical Engineering, 2014; 9(6): 866–876.
[16] Alfaro-Ayala J A, Ayala-Ram R V, Gallegos-Mu O A, Uribe-Ramirez A R. Optimal location of axial impellers in a stirred tank applying evolutionary programing and CFD. Chemical Engineering Research and Design, 2015; 100: 203–211.
[17] Bonnot S, Cabaret F, Fradette L, Tanguy P A. Characterization of Mixing Patterns in a Coaxial Mixer. Chemical Engineering Research and Design, 2007; 85(8): 1129–1135.
[18] Couerbe G, Fletcher D F, Xuereb C, Poux M. Impact of thixotropy on flow patterns induced in a stirred tank: Numerical and experimental studies. Chemical Engineering Research & Design, 2008; 86(6A): 545–553.
[19] Zadghaffari R, Moghaddas J S, Revstedt J. A mixing study in a double-Rushton stirred tank. Computers & Chemical Engineering, 2009; 33(7): 1240–1246.
[20] Holman J P. Heat Transfer (9th edition). London: MaGraw-Hill, 2001.
[21] Achouri R, Mokni I, Mhiri H, Bournot P. A 3D CFD simulation of a self inducing Pitched Blade Turbine Downflow. Energy Conversion and Management, 2012; 64: 633–641.
[22] Sack J R, Urrutia J. Handbook of Computational Geometry. Amsterdam: Elsevier Science, 2000.
[23] Qi N, Zhang H, Zhang K, Xu G, Yang Y P. CFD simulation of particle suspension in a stirred tank. Particuology, 2013; 11(3): 317–26.
[24] Ascanio G. Mixing time in stirred vessels: A review of experimental technique. Chinese Journal of Chemical Engineering, 2015; 23(7): 1065–76.
[25] Roy R K. Design of experiments using the Taguchi approach: 16 steps to product and process improvement. New York: John Willey and Sons Inc., 2001.
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Published
2018-08-08
How to Cite
Cui, Y., Zhang, H., Li, X., Yang, M., & Guan, Z. (2018). Computational and experimental investigation of laminar flow mixing system in a pitched-blade turbine stirred tank. International Journal of Agricultural and Biological Engineering, 11(4), 111–117. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2729
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Power and Machinery Systems
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