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Received November 15, 2004
Accepted December 17, 2004
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Bubble Drift Velocity from the Bed Collapse Technique in Three-Phase Fluidized Beds
Sung Soo Park
Seok Min Kang
Dong Hyun Lee†
Young Kwan Lee
Ji-Heung Kim
Gui Young Han
Norman Epstein1
John R. Grace1
Sang Done Kim2
Department of Chemical Engineering, Sungkyunkwan Univ., Suwon 440-746, Korea 1Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, V6T 1Z4, Canada 2Department of Chemical & Biomolecular Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Canada
dhlee@skku.edu
Korean Journal of Chemical Engineering, March 2005, 22(2), 328-333(6), 10.1007/BF02701505
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Abstract
Transient behavior of a bed collapsing after cut-off of gas supply into a three-phase fluidized bed was determined in a 0.21 m-diameter half-tube acrylic column having a test section 1.8 m high. The transient behavior of the bed collapse after cut-off of the gas supply to the beds was monitored by a video camera (30 frames/s). A theory was developed to account for the dynamic behavior of the bed collapse after the gas supply shut-off to three-phase fluidized beds. The bubble drift velocity was theoretically calculated by gas and liquid phase holdups at steady state condition. At a liquid velocity of 0.103 m/s and gas velocity of 0-0.023 m/s, bubble size was uniform in the dispersed bubble flow regime. However, as the gas velocity increased above 0.023 m/s, the discrete or coalesced bubble flow regime could be observed. The agreement between the predicted and experimental values is acceptable in the dispersed bubble flow regime, but the agreement becomes poorer with increasing gas velocity.
References
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Bhatia VK, Epstein N, Three-Phase Fluidization: A Generalized Wake Model, Fluidization and Its Applications, Cepadeus-Editions, Toulouse(France), 380 (1974)
Chen YM, Fan LS, Chem. Eng. Sci., 45, 935 (1990)
Chern SH, Fan LS, Muroyama K, AIChE J., 30, 288 (1984)
El-Temtamy SA, Epstein N, Chem. Eng. J., 19, 153 (1980)
Fan LS, Gas-Liquid-Solid Fluidization Engineering, Butterworth, Stoneham, MA (1989)
Han HD, Lee W, Kim YK, Kwon JL, Choi HS, Kang Y, Kim SD, Korean J. Chem. Eng., 20(1), 163 (2003)
Han JH, Wild G, Kim SD, Chem. Eng. J., 43, 67 (1990)
Jin Y, Zhang JP, "Bed Collapse Technique for Estimating Parameters of Generalized Wake Model for a Three-Phase Fluidized Bed", Proc. 5th Chinese National Fluidization Conference, Beijing, 327 (1990)
Kim SD, Baker CGJ, Bergougnou MA, Can. J. Chem. Eng., 50, 695 (1972)
Kwauk M, Fluidization: Idealized and Bubbleless, with Application, Science Press and Ellis Horwood, Bejing (1992)
Larachi F, Belfares L, Iliuta I, Grandjean BPA, Ind. Eng. Chem. Res., 40(3), 993 (2001)
Lee DH, Epstein N, Grace JR, Korean J. Chem. Eng., 17(6), 684 (2000)
Lee DH, Park SS, Choi WW, Kim DJ, Kim JH, Lee YK, Sim SJ, Kim SD, Korean J. Chem. Eng., 20(6), 1166 (2003)
Lee DL, KIm JO, Kim SD, Chem. Eng. Commun., 119, 179 (1993)
Maucci E, Briens CL, Martinuzzi RJ, Wild G, Powder Technol., 103(3), 243 (1999)
Park SH, Kim SD, Korean J. Chem. Eng., 20(1), 121 (2003)
Saberian-Beoudjenni M, Wild G, Charpentier JC, Fortin Y, Euzen JP, Patoux R, Entropie, 120, 30 (1984)
Zhang JP, Grace JR, Epstein N, Lim KS, Chem. Eng. Sci., 52(21-22), 3979 (1997)
