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Received May 3, 2002
Accepted November 20, 2002
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Characterization of Pressure Signals in a Bubble Column by Wavelet Packet Transform
Department of Chemical Engineering, Woosuk University, Chonbuk 565-701, Korea 1Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
drpark@woosuk.ac.kr
Korean Journal of Chemical Engineering, January 2003, 20(1), 128-132(5), 10.1007/BF02697197
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Abstract
All experiments of pressure fluctuations were carried out in a bubble column with a moderately large column of 0.376 m ID. The recently developed technique of wavelet packet transform based on localized wavelet functions is applicable to analysis of the fluctuating signals. The time series of pressure fluctuation signals have been analyzed by means of wavelet packet transform components, decomposition through best basis algorithm and time-frequency representation. By resorting to this technique, the objects in bubbly flow regime have fine scales and frequencies than ones in churn-turbulent flow regime. Thus, this wavelet packet transform method enables us to obtain the frequency content of local complex flow behaviors in a bubble column.
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References
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Lee GS, Kim SD, J. Chem. Eng. Jpn., 21, 515 (1988)
Park SH, "Phase Holdups and Pressure Fluctuations in Two-and Three-Phase Fluidized Beds," Master Thesis, Korea Advanced Institute of Science and Technology (1989)
Park SH, Kang Y, Cho YJ, Fan LT, Kim SD, J. Chem. Eng. Jpn., 34(2), 158 (2001)
Park SH, Kim SD, Korean J. Chem. Eng., 18(6), 1015 (2001)
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Shumpe A, Deckwer WD, Bioprocess Eng., 2, 79 (1987)
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