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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 26, 2002
Accepted August 27, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Experimental, Statistical and Stochastic Studies of Pressure Fluctuations in a Three-phase Fluidized Bed with a Moderately Large Diameter

Soung Hee Park^† Sang Done Kim¹

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), 121-127(7), 10.1007/BF02697196

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Abstract

Hydrodynamic properties of bubbling flow through a three-phase fluidized bed with a moderately large diameter have been characterized with statistical and stochastic analyses of a comprehensive set of experimentally measured pressure fluctuations in the bed. The analyses have yielded the fluctuations’ histogram, mean, maximum, minimum, standard deviation, skewness, kurtosis, and power-spectral-density function. As the gas flow rate increased with other operating conditions fixed, the mean and standard deviation increased, the skewness decreased, the distribution of the power-spectral-density function broadened, and the major frequency increased. In contrast, as the liquid flow rate increased, the mean and standard deviation decreased, the skewness and kurtosis increased, the power-spectral-density function narrowed, and the major frequency decreased. The hydrodynamic properties of a three-phase_x000D_ fluidized bed with a moderately large column in terms of pressure fluctuations are strongly affected by the flow rates of both the fluidizing gas and liquid.

Keywords

Pressure Fluctuations Fluidized Bed Statistical Analysis Stochastic Analysis

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