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The Effect of Interparticle Forces on Fluidization Regimes in the Magnetized Fluidized Beds
Biological Engineering, Oregon State University, Corvallis, OR 97331, USA 1Department of Chemical Engineering, Oregon State University, Corvallis, OR 97331, USA 2Department of Chemical Engineering, Hanyang University, Ansan 425-791, Korea
leewo@engr.orst.edu
Korean Journal of Chemical Engineering, May 1999, 16(3), 362-370(9), 10.1007/BF02707126
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Abstract
This paper investigated the influence of interparticle forces on the quality of fluidization in a magnetically stabilized fluidized bed (MSFB), where we can "artificially" create interparticle forces (Fattr) of any magnitude by applying an external magnetic field to ferromagnetic particles. A theoretical model was proposed which predicts the transition point from a homogeneous to a heterogeneous fluidization as a function of the magnitude of the interparticle force and other physical characteristics of both particles and fluids that are usually observed in fluidization (ρp, ρf, μ, dp, ε). The concept of the elastic wave velocity, Ue, and the continuity wave velocity, Uε, was introduced. In particular, the interparticle force manipulated by an externally applied magnetic field was taken into account in addition to a general consideration of a conventional fluidized bed. Bubbles from in a bed when the continuity wave velocity becomes faster than the elastic wave velocity. The simulation demonstrated the proposed model could predict the transition point of fluidization regime with reasonable accuracy.
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Massimilla L, Donsi G, Powder Technol., 15, 253 (1976)
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Overbeek JG, Powder Technol., 37, 195 (1984)
Richardson JF, Zaki WN, Trans. Inst. Chem. Eng., 32, 35 (1954)
Rietema K, Chem. Eng. Sci., 28, 1493 (1973)
Rietema K, Piepers HW, Chem. Eng. Sci., 45(6), 1627 (1990)
Rosensweig RE, Science, 206, 57 (1979)
Rosensweig RE, Ind. Eng. Chem. Fundam., 18(3), 260 (1979)
Rowe PN, Chem. Eng. Sci., 42, 2795 (1987)
Saxena SC, Shrivastava S, Powder Technol., 64, 57 (1991)
Saxena SC, Shrivastava S, Powder Technol., 45(4), 1125 (1990)
Seville JPK, Clift R, Powder Technol., 37, 117 (1984)
Siegell JH, Powder Technol., 52, 139 (1987)
Siegell JH, Powder Technol., 55, 127 (1988)
Siegell JH, Ind. Eng. Chem. Process Des. Dev., 21, 135 (1982)
Slis PL, Willemse W, Kramers H, Appl. Sci. Res., A8, 209 (1959)
Stanley VM, Gabriel GS, "Electromagnetic Concepts and Application," Prentice-Hall, N.J. (1982)
Verloop J, Heertjes PM, Chem. Eng. Sci., 25, 825 (1970)
Wallis GB, "One-Dimensional Two-Phase Flow," McGraw-Hill, New York (1969)
Zenz FA, Othmer DF, "Fluidization and Fluid-Particle Systems," Reinhold (1960)
