Characterization of various structures in gas-solid fluidized beds by recurrence quantification analysis--颗粒学报PARTICUOLOGY

Tahmasebpour, M., Zarghami, R., Sotudeh-Gharebagh, R., & Mostoufi, N. (2013). Characterization of various structures in gas-solid fluidized beds by recurrence quantification analysis. Particuology, 11(6), 647–656. https://doi.org/10.1016/j.partic.2012.08.005

Characterization of various structures in gas-solid fluidized beds by recurrence quantification analysis

M. Tahmasebpour, R. Zarghami^*, R. Sotudeh-Gharebagh, N. Mostoufi

a Multiphase Research Systems Laboratory, Oil and Gas Centre of Excellence, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran

10.1016/j.partic.2012.08.005

Volume 11, Issue 6, December 2013, Pages 647-656

Received 3 May 2012, Revised 4 July 2012, Accepted 26 August 2012, Available online 20 March 2013.

E-mail: rzarghami@ut.ac.ir

Highlights

► Nonlinear hydrodynamics of gas-solid fluidized beds were investigated with recurrence plot.

► Multi-scale structures for pressure signals of beds were studied via Fourier and wavelet transform.

► Recurrence rate, determinism, and laminarity of pressure fluctuations represent multi-scale structures in the beds.

Abstract

Gas-solid fluidized beds are widely considered as nonlinear and chaotic dynamic systems. Pressure fluctuations were measured in a fluidized bed of 0.15 m in diameter and were analyzed using multiple approaches: discrete Fourier transform (DFT), discrete wavelet transform (DWT), and nonlinear recurrence quantification analysis (RQA). Three different methods proposed that the complex dynamics of a fluidized bed system can be presented as macro, meso and micro structures. It was found from DFT and DWT that a minimum in wide band energy with an increase in the velocity corresponds to the transition between macro structures and finer structures of the fluidization system. Corresponding transition velocity occurs at gas velocities of 0.3, 0.5 and 0.6 m/s for sands with mean diameters of 150, 280 and 490 μm, respectively. DFT, DWT, and RQA could determine frequency range of 0−3.125 Hz for macro, 3.125−50 Hz for meso, and 50−200 Hz for micro structures. The RQA showed that the micro structures have the least periodicity and consequently their determinism and laminarity are the lowest. The results show that a combination of DFT, DWT, and RQA can be used as an effective approach to characterize multi-scale flow behavior in gas-solid fluidized beds.

Graphical abstract

Keywords

Fluidization; Recurrence quantification analysis; Multi-scale; Pressure fluctuations; Chaos; Hydrodynamics

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