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 timefrequency 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.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Coifman, R. and Wickerhauser, V., “Entropy-Based Algorithms for Best Basis Selecton,”IEEE Transactions on Information Theory,38, 713 (1992).
Harry, E. A. and Akker, V. D., “Coherent Structures in Multiphase Flows,”Powder Technology,100, 123 (1998).
Kang, Y.M., Ko, H., Park, S. H., Fan, L. T. and Kim, S.D., “Mixing of Particles in Gas-Liquid-Solid Fluidized Beds Containing a Binary Mixture of Particles,”I&EC Research,37, 4167 (1998).
Kang, Y., Cho, Y. J., Woo, K. J., Kim, K. I. and Kim, S. D., “Bubble Properties and Pressure Fluctuations in Pressurized Bubble Columns,”Chem. Eng. Sci.,55, 411 (2000).
Kang, Y., Cho, Y. J., Woo, K. J. and Kim, S.D., “Diagnosis of Bubble Distribution and Mass Transfer in Pressurized Bubble Columns with Viscous Liquid Medicine,”Chem. Eng. Sci.,54, 4887 (1999).
Kumar, P. and Foufoula-Georgiou, E., “Wavelets in Geophysics,” Academic Press, Australia (1994)
Kwon, H.W., Han, J.H., Kang, Y. and Kim, S. D., “Bubble Properties and Pressure Fluctuations in Bubble Columns,”Korean J. Chem. Eng.,11, 204 (1994).
Lee, G. S. and Kim, S. D., “Pressure Fluctuations in Turbulent Fluidized Beds,”J. Chem. Eng. Japan,21, 515 (1988).
Park, S. H., “Phase Holdups and Pressure Fluctuations in Two- and Three-Phase Fluidized Beds,” Master Thesis, Korea Advanced Institute of Science and Technology (1989).
Park, S. H., Kang, Y., Cho, Y. J., Fan, L. T. and Kim, S. D., “Characterization of Pressure Signals in a Bubble Column by Wavelet Transform,”J. of Chem. Eng. of Japan,34, 158 (2001).
Park, S.H. and Kim, S.D., “Wavelet Transform Analysis of Pressure Fluctuation Signals in a Three-Phase Fluidized Bed,”Korean J. Chem. Eng.,18, 1015 (2001).
Shah, Y. T., Kelkar, B.G., Godbole, S. P. and Deckwer, W.D., “Design Parameters Estimations for Bubble Column Reactors,”AIChE J.,28, 353 (1982).
Shumpe, A. and Deckwer, W.D., “Viscous Media in Tower Bioreactors: Hydrodynamic Characteristics and Mass Transfer Properties,”Bioprocess Eng.,2, 79 (1987).
Wickerhauser, V., “Adapted Wavelet Analysis-from to Theory to Software,” A. K. Peters, Ltd. (1994).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Park, S.H., Kim, S.D. Characterization of pressure signals in a bubble column by wavelet packet transform. Korean J. Chem. Eng. 20, 128–132 (2003). https://doi.org/10.1007/BF02697197
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02697197