Application of an EMMS Model for Bubbly Fluidized Bed

Abstract:

In computational fluid dynamics (CFD) of fluidization processes, the modeling of drag between fluid and particles has a direct effect on the results. The EMMS (Energy Minimization Multi-Scale) models are based on the micro-scale of individual particles and the macro scale of equipment to model the meso-scale phenomena related to particle clustering, which directly affect the drag between fluid and particles. The EMMS/bubbling model was introduced as a change from the classic EMMS model to specific bubbling fluid bed conditions. The present work aims to apply the EMMS/bubbling model in the CFD of Geldart-D particles fluidized by air. The results were compared with results from the literature. It was observed that, for particles of Geldart groups A and B, the results using the EMMS/bubbling model agreed well with the literature. The CFD results for Geldart-D particles showed good agreement with the literature results for this method using coarse grids.

• Periodical: Defect and Diffusion Forum (Volume 372)
• Pages: 170-179
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.372.170
• Online since: March 2017
• Authors: Daniel A. Kestering, Flavia Schwarz Franceschini Zinani*, George C. Bleyer
• Keywords: Bubbling Fluidized Bed, EMMS, Geldart D, Multi-Scale Energy Minimization

References

[1] Pannala, S., Syamlal, M., O`Brien, T. J., 2011, Computational Gas-Solid Flows and Reacting Systems: Theory, Methods and Practice. Hersheys – USA. United States of America by Engineering Science Reference.

DOI: 10.4018/978-1-61520-651-3.ch001

[2] Lun, C.K.K., Savage, S.B., Jeffrey, D.J., Chepurniy, N. 1984, Kinetic theories for granular flow: inelastic particles in Couette flow and slightly inelastic particles in a general flowfield. Journal of Fluid Mechanics, 140: 223-256.

DOI: 10.1017/s0022112084000586

[3] Agrawal, K., Loezos, P.N., Syamlal, M., Sundaresan, S. 2001, The role of meso-scale structures in rapid gas-solid flows. Journal of Fluid Mechanics, 445, pp.151-185.

DOI: 10.1017/s0022112001005663

[4] Gidaspow, D. 1994, Multiphase Flow and Fluidization – Continuum and Kinetic Theory Descriptions. Ed. Academic Press, London, 467 p.

DOI: 10.1002/aic.690420438

[5] Syamlal, M., O'Brien, T.J. 1987, A Generalized drag correlation for multiparticle systems. Morgantown Energy Technology Center DOE Report.

[6] Taghipour, F., Ellis, N., Wong, C. 2005, Experimental and computational study of gas–solid fluidized bed hydrodynamics. Chemical Engineering Science, 60: 6857–6867.

DOI: 10.1016/j.ces.2005.05.044

[7] Benyahia, S., Syamlal, M, O. Brien, T.J. 2006, Extension of Hill Koch Ladd drag correlation over all ranges of Reynolds number and solids volume fractions. Powder Technology, 162: 166-174.

DOI: 10.1016/j.powtec.2005.12.014

[8] Li, J., & Kwauk, M. 1994, Particle–fluid two-phase flow: The energy-minimization multi-scale method. Beijing: Metallurgical Industry Press.

[9] Li, J., Tung, Y., & Kwauk, M. 1988, Energy transport and regime transition of particle–fluid two-phase flow. In P. Basu, & J. F. Large (Eds. ), Circulating fluidized bed technology II (p.75–87). Oxford: Pergamon Press.

DOI: 10.1016/b978-0-08-036225-0.50012-5

[10] Li, J., & Kwauk, M. 2003, Exploring complex systems in chemical engineering—The multi-scale methodology. Chemical Engineering Science, 58, 521–535.

DOI: 10.1016/s0009-2509(02)00577-8

[11] Shi, Z., Wang, W., Li, J., 2011, Bubble-Based Emms Model For Gas–Solid Bubbling Fluidization, Chemical Engineering Science, vol. 66, no. 22, pp.5541-5555.

DOI: 10.1016/j.ces.2011.07.020

[12] Geldart, D., 1973, Types of gas fluidization. Powder Technology, V. 7, 285-292.

DOI: 10.1016/0032-5910(73)80037-3

[13] J. Li et al., From Multiscale Modeling to Meso-Science, DOI: 10. 1007/978-3-642-35189-1_1, Springer-Verlag Berlin Heidelberg (2013).

[14] Ergun, S., 1952, Fluid flow through packed columns, Chemical Engineering Progress, vol 48, p.90–98.

[15] Zenit, R., Hunt M.L., 2000, Solid fraction fluctuations in solid–liquid flows. International Journal of Multiphase Flow, vol. 26, p.763–781.

DOI: 10.1016/s0301-9322(99)00066-x

[16] Zhang, D. Z., VanderHeyden, W. B., 2002, The Effects Of Mesoscale Structures On The Macroscopic Momentum Equations For Two-Phase Flows. International Journal of Multiphase Flow, vol. 28, p.805–822.

DOI: 10.1016/s0301-9322(02)00005-8

[17] Wen, C. Y., Yu, Y. H., 1966, A Generalized Method For Predict Minimum Fluidization Velocity. AIChE Journal, vol. 12, n. 3, pp.610-612.

DOI: 10.1002/aic.690120343