Energy Dissipation Rate and Pressure Fluctuations in a Three Phase Fluidized Bed with a Large Column Diameter

Soung Hee Park

Korean Journal of Chemical Engineering, Vol.21, No.5, 1066-1071, September, 2004

DOI10.1007/BF02705594 Export Citation

Energy Dissipation Rate and Pressure Fluctuations in a Three Phase Fluidized Bed with a Large Column Diameter

Soung Hee Park^†

Department of Chemical Engineering, Woosuk University, Chonbuk 565-701, Korea

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The effects of liquid (0.02-0.10 m/s) and gas (0.0-0.10 m/s) velocities and particle size (1.0, 2.3, 3.0 mm) on the pressure fluctuations and energy dissipation rate in three phase fluidized beds were determined in a large column (0.376 m-I.D.x2.1 m high). The standard deviation of pressure fluctuations and energy dissipation rate increase with gas and liquid velocities but, decrease in the radial direction of three phase fluidized beds. The energy dissipation rate was well correlated with dimensionless groups as: E_d=16.788Fr_l^0.183Fr_g^0.139(1-ψ)^0.442+1.265Fr_g^0.143 Re^0.181

Keywords:Pressure Fluctuation;Energy Dissipation Rate;Three-phase;Fluidization

[References]

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[1] Davidson JF, Harrison D, "Fluidization," Academic Press (1978)

[2] Davies MR, Int. J. Heat Mass Transf., 16, 2043 (1973)

[3] Fan LS, Satija S, Wisecarver K, AIChE J., 32, 338 (1986)

[4] Fan LT, Ho TC, Hiraoka S, Walawender WP, AIChE J., 27, 388 (1984)

[5] Frost W, Moulden TH, "Handbook of Turbulence," Plenum Press, 141 (1977)

[6] Hinze JO, "Turbulence," McGraw Hill Press (1959)

[7] Jin GT, "Bubble and Pressure Fluctuations Characteristics in Bubble Column and Three Phase Fluidized Beds," Ph.D. Thesis, KAIST (1985)

[8] Joshi JB, Trans. Instn. Chem. Engrs., 58, 155 (1980)

[9] Kang Y, Woo KJ, Ko MH, Cho YJ, Kim SD, Korean J. Chem. Eng., 16(6), 784 (1999)

[10] Kim SD, Baker CGJ, Bergougnou MA, Can. J. Chem. Eng., 53, 134 (1975)

[11] Kitano K, Ikeda K, "Flow Regimes of Three Phase Fluidized Beds," Proc. Of Asian Conf. On Fluidized-Bed and Three-Phase Reactors, Yoshida, K. and Morooka, S., eds., Soc. of Chem. Eng. of Japan, Tokyo (1988)

[12] KWON HW, KIM SD, Korean J. Chem. Eng., 7(3), 182 (1990)

[13] Lee GS, Kim SD, J. Chem. Eng. Jpn., 21, 515 (1988)

[14] Lirag RC, Littman H, AIChE Symp. Ser., 67, 11 (1971)

[15] Morooka S, Uchida K, Kato Y, J. Chem. Eng. Jpn., 15, 29 (1982)

[16] Park SH, Kim SD, Korean J. Chem. Eng., 18(6), 1015 (2001)

[17] Tennekes H, Lumley JL, "A First Course in Turbulence," MIT Press, 263 (1973)

[18] Verloop J, Heertjes PM, CES, 29, 1035 (1974)

[19] Yu YH, "Bubble Characteristics and Local Liquid Velocity in Two and Three Phase Fluidized Beds," Ph. D. Thesis, KAIST (1989)

[20] Yu YH, Kim SD, AIChE J., 34, 2069 (1988)