Fluid flow simulation of industrial fixed bed mixed-flow grain dryer using k-ω SST turbulence model
Keywords:
computational methods, fixed bed, porous medium, soybean dryer, turbulent flowAbstract
The fluid dynamics analysis on industrial, mixed-flow grain dryers with fixed bed using computational techniques is necessary to assist the design of such equipment contributing to cost reduction in the dryer projects and agricultural drying operations that involve the production of grains in the world. This study presents a Computational Fluid Dynamic (CFD) solution for air flow analysis in an industrial dryer. The air flow at the inlet and outlet of the dryer was investigated using the k-ω SST turbulence model. The dryer region with soybean was considered as a laminar porous medium flow in the permanent and isothermal regime, having for the model a simplified geometry with the tower considered as a porous medium and the air inlet and outlet as a turbulent fluid domain. The flow was treated with a permanent and isothermal regime. Dryer flow and pressures were used according to design parameters. To validate the k-ω SST turbulence model, the velocity profile at the dryer inlet was obtained experimentally, which presented results with good agreement between the numerical and the experimental model. The model obtained satisfactory results of the computational validation of the air flow in the dryer with good convergence requiring a minimum of computational effort, being suitable for the simulation of industrial-scale dryers, as to its air flow through a tower, operating with fixed bed soybean in the steady and isothermal regime. Keywords: computational methods, fixed bed, porous medium, soybean dryer, turbulent flow DOI: 10.25165/j.ijabe.20211402.5321 Citation: Visconcini A R, Andrade C M G, Costa A M S. Fluid flow simulation of industrial fixed bed mixed-flow grain dryer using k-ω SST turbulence model. Int J Agric & Biol Eng, 2021; 14(2): 226–230.References
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[19] Prukwarun W, Khumchoo W, Seancotr W, Phupaichitkun S. CFD simulation of fixed bed dryer by using porous media concepts: Unpeeled longan case. Int J Agric & Biol Eng, 2013; 6(1): 100–110.
[20] ANSYS INC. ANSYS Fluent–Theory guide release 19.1, 2018; 814p.
[2] Scaar H, Franke G, Weigler F Delele M, Tsotsas E, Mellmann J. Experimental and numerical study of the airflow distribution in mixed-flow grain dryers. Drying Technology, 2016; 34(5): 595–607.
[3] Bruce D M. Simulation of multiple-bed concurrent-, counter-, and mixed-flow grain dryers. Journal of Agricultural Engineering Research, 1984; 30(4): 361–372.
[4] Courtois F, Abud-Archila M, Bonazi C, Meot J, Trystram G. Modeling and control of a mixed-flow rice dryer with emphasis on breakage quality. Journal of Food Engineering, 2001; 49: 303–309.
[5] Kowalski S J, Pawlowski A. Modeling of kinetics in stationary and intermittent drying. Drying Technology, 2010; 28: 1023–1031.
[6] Khatchatourian O A, Vielmo H A, Bortolaia L A. Modelling and simulation of cross flow grain dryers. Biosystems Engineering, 2013; 116: 335–345.
[7] Cao C W, Yang D Y, Liu Q. Research on modeling and simulation of mixed flow grain dryer. Drying Technology, 2007; 25(4): 681–687.
[8] Matthies H J. Der Strömungswiderstand beim Belüften Landwirtschaftlicher Erntegüter; Düsseldorf, Germany: VDI-Verlag. 1956; 454p.
[9] Brooker D B. Pressure patterns in grain-drying systems established by numerical methods. Transactions of the ASAE, 1961; 4(1): 72–74.
[10] Thorpe G R, Hunter A J. Expressions for pressure and velocity distributions in non-uniformly aerated grain bulks. Journal of Agricultural Engineering Research, 1977; 22(1): 27–35.
[11] Smith E A. 3-dimensional analysis of air velocity and pressure in beds of grain and hay. Journal of Agricultural Engineering Research, 1982; 27(2): 101–117.
[12] Hunter A J. Pressure difference across an aerated seed bulk for some common duct and store cross-sections. Journal of Agricultural Engineering Research, 1983; 23(5): 437–450.
[13] Olesen H T. Grain Drying. Innovation development engineering, Aps. Aasvej 21, 7700 Thisted, Denmark, 1987; 161p.
[14] Cenkowski S, Miketinac M, Kelm A. Airflow patterns in a mixed-flow dryer. Journal of Canadian Agricultural Engineering, 1990; 32(1): 85–90.
[15] Sun L, Arnauld G, Fohr J P. Air flow in a corn drier. In Proceedings of the 7th International Drying Symposium (Drying ‘91), Prague, Czechoslovakia: Elsevier Science Ltd, 1991; pp.447–454.
[16] Roman F, Stahl-Schafer V, Hensel O. Improvement of air distribution in a fixed bed dryer using computational fluid dynamics. Biosystems Engineering, 2012; 112(4): 359–369.
[17] Scaar H, Weigler F, Mellmann J. Numerical simulation of airflow distribution in mixed-flow dryer. Acta Horticulturae, 2013; 1008: 113–118.
[18] Rupesh K R, Jyeshtharaj B J. CFD modeling of pressure drop and drag coefficient in fixed and expanded beds. Elsevier, chemical engineering research and design, 2008; 86: 444–453.
[19] Prukwarun W, Khumchoo W, Seancotr W, Phupaichitkun S. CFD simulation of fixed bed dryer by using porous media concepts: Unpeeled longan case. Int J Agric & Biol Eng, 2013; 6(1): 100–110.
[20] ANSYS INC. ANSYS Fluent–Theory guide release 19.1, 2018; 814p.
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Published
2021-04-03
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Visconcini, A. R., Andrade, C. M. G., & Costa, A. M. de S. (2021). Fluid flow simulation of industrial fixed bed mixed-flow grain dryer using k-ω SST turbulence model. International Journal of Agricultural and Biological Engineering, 14(2), 226–230. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5321
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Agro-product and Food Processing Systems
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