Investigating the hydrodynamics of vibro-fluidized bed of hydrophilic titanium nanoparticles

Hydrodynamics of fluidization of hydrophilic titanium nanoparticles with vibration was investigated through pressure fluctuations using recurrence quantification analysis. The bed expansion revealed that the bed operates in the ABF regime. The standard deviation of the pressure fluctuations indicated that vibration reduces the minimum fluidization velocity. Hydrodynamic structures were defined using the wavelet transform analysis of pressure fluctuations and the effect of vibration was investigated through the energy of the pressure signal and the recurrence analysis. It was shown that the agglomerates have the most impact on the fluidization of the nanoparticles and vibration has a significant effect on this structure. Using the energy of the signal and recurrence analysis, characteristics of the vibration on the fluidization were defined. The energy of finer structures is higher in the vibrated bed, indicating a more stochastic pattern in this case. The recurrence rate showed the dynamic behavior of formation and breakage of agglomerates in the bed. (c) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.