Numerical Investigation of Hydrodynamic Behaviors in Gas-Solid Magnetic Fluidized Beds

Abstract:

A mathematical model describing the transient hydrodynamic behaviours is introduced to predict the effect of magnetic field intensity and process parameters in magnetically stable fluidized beds (MSFBs). Computational fluid dynamics (CFD) code Fluent 6.2 has been used to investigate the hydrodynamics of a gas-solid MSFB operated with fine particles. The model is incorporated into simulations based on an Eulerian approach. In the simulations, the closure models describing the hydrodynamics of the solids phase are directly affected by the behavior of magnetic field intensity. The simulations are compared with experiments at different gas Reynolds numbers (ReG = uGdp/vG) and magnetic field intensity (Er = 3μ0MpH/2gdpρp). The agreement obtained between the simulation results and experimental data for local solid holdup is good at lower ReG and Er values.

• Periodical: Advanced Materials Research (Volumes 560-561)
• Pages: 1165-1173
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.560-561.1165
• Online since: August 2012
• Authors: Hui Li, Hui Yang
• Keywords: Fine Particles, Local Holdup, Magnetic Field, Magnetic Fluidized Bed, Numerical Simulation

References

[1] Y.A. Liu, R.K. Hamby and R.D. Colberg: Powder Technology, 64 (1991) 3.

[2] A.H. Cohen and C. Tien: Powder Technology, 64 (1991) 147.

[3] J. Rincon: Separation Science and Technology, 28 (1993) 1241.

[4] C. Webb, H.K. Kang, G. Moffat and RA Williams: The Chemical Engineering Journal, 61 (1993) 241.

[5] T. Bahar and S.S. Celebi: Enzyme and Microbial Technology, 26 (2000) 28.

[6] Y. Ding and Y. Sun: Chemical Engineering Science, 60 (2005) 917.

[7] J. Y. Hristov: Thermal Science, 10 (2006) 19.

[8] J. Hristov: Canadian Journal of Chemical Engineering, 86 (2008) 470.

[9] J. Hristov: China Particuology, 5 (2007) 121.

[10] J. Hristov, China Particuology, 5 (2007) 103.

[11] J. Hristov: Particuology, 7 (2009) 183.

[12] D.L. Ermak and H. Buckholtz: Journal of Computational Physics, 35 (1980) 169.

[13] Y.J. Kim and S.S. Kim: Proceedings of the ASME/JSME Thermal Engineering Conference, 2 (1991) 95.

[14] H. Hirano and H. Ozoe: Proceedings of the ASME/JSME Thermal Engineering Conference, 3 (1992) 131.

[15] H. Hirano and H. Ozoe: Proceedings of the Sixth International Symposium on Transport Phenomena in Thermal Engineering, 1 (1993) 65.

[16] H. Hirano and H. Ozoe: Proceedings of the 10th International Heat Transfer Conference, 2 (1994) 367.

[17] Y.H. Wang: Journal of Southeast University(China), 32 (2002)936.

[18] J. Casal and J. Arnaldos: Powder Technology, 64 (1991) 43.

[19] M. AI-Mulhim: Enhancement of Mass Transfer Coefficient in a Magnetically Stabilized Liquid-Solid Fluidized-Bed, MS., Oregon State University, USA 1995. p.78.