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Particle Flow Behavior in Three-Phase Fluidized Beds

Yong Kang^1† Kwang-Jae Woo¹ Myung-Han Ko¹ Yong-Jun Cho¹ Sang-Done Kim^{1 2}

¹Department of Chemical Engineering, Chungnam National University, Taejon, Korea ²Department of Chemical Engineering, KAIST, Taejon, Korea

Korean Journal of Chemical Engineering, November 1999, 16(6), 784-788(5), 10.1007/BF02698352

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Abstract

Non-uniform flow behavior of fluidized solid particles in three-phase fluidized beds has been analyzed by adopting the stochastic method. More specifically, pressure fluctuation signals from three-phase fluidized beds (0.152 m ID x 2.5 m in height) have been analyzed by resorting to fractal and spectral analysis. Effects of gas flow rate (0.01-0.07 m/s), liquid flow rate (0.06-0.18 m/s) and particle size (0.001-0.006 m) on the characteristics of the Hurst exponent, spectral exponent and Shannon entropy of pressure fluctuations have been investigated. The Hurst exponent and spectral exponent of pressure fluctuations attained their local maxima with the variation of liquid flow rate. The Shannon entropy of pressure fluctuation data, however, attained its local minima with the variation of liquid flow rate. The flow transition of fluidized solid particles was detected conveniently by means of the variations of the Hurst exponent, spectral exponent and Shannon entropy of pressure fluctuations in the beds. The flow behavior resulting from multiphase contact in three-phase fluidized beds appeared to be persistent and can be characterized as a higher order deterministic chaos.

Keywords

Three Phase Fluidized Beds Stochastic Analysis Pressure Fluctuations Hurst Exponent Shannon Entropy Spectral Exponent Flow Transition of Particles

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