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Study of transition velocity from bubbling to turbulent fluidisation by recurrence plots analysis on pressure fluctuations

Authors

  • M. Tahmasebpour,

    1. Multiphase Processes Department, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, Tehran, Iran
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  • Reza Zarghami,

    Corresponding author
    1. Multiphase Processes Department, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, Tehran, Iran
    • Multiphase Processes Department, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, Tehran, Iran.
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  • Rahmat Sotudeh-Gharebagh,

    1. Multiphase Processes Department, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, Tehran, Iran
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  • Navid Mostoufi

    1. Multiphase Processes Department, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, Tehran, Iran
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Abstract

Recurrence plot (RP) and recurrence quantification analysis (RQA) have been used for studying the dynamic behaviour of gas–solid fluidised beds. RQA variables (recurrence rate, determinism, laminarity and entropy) were calculated for the bubbling fluidised bed at different superficial gas velocities (ranging 0.1–1.5 m/s) and aspect ratios (1, 1.5 and 2). Patterns within RP changed with these various conditions, and subsequently RQA parameters changed accordingly. These changes can be potentially useful to study the bed hydrodynamic. It was shown that transition from bubbling to turbulent velocity can be determined by the variation of recurrence rate and entropy. © 2011 Canadian Society for Chemical Engineering

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