Frequency-based characterization of liquid–solid fluidized bed hydrodynamics using the analysis of vibration signature and pressure fluctuations

摘要: Abstract This work is mainly focused on the frequency-based analyses of non-invasive vibration and pressure fluctuations signals to characterize main hydrodynamic events inside a liquid–solid fluidized bed. The power spectra bed shell local in frequency domain were calculated over wide range liquid velocities cover pathway behavior between three events, namely: minimum fluidization, cluster-circulating-to-individual particle motion (termed as solid regime transition), entrainment points. First rise mean spectral density function (PSDFm) predicted fluidization accurately while sharp level off showed velocity. Global maxima PSDFm vibrations well second minima corresponded transition Finally, plateau signatures indicated complete entrainment. Moreover, energy-based wavelet transform coupled with Hurst exponent analysis provided detailed structure evolution, which led successful accurate predictions