Analysis of time signals related to wall pressure fluctuations in a turbulent fluidized bed of FCC

The fluidized bed turbulent regime is an intermediate regime between bubbli ng fluidization and pneumatic transport, which can be characterized by the study of wall pressure fluctuations with time. Our experimental results con firm that the statistical analysis of the signal enables to determine the r egime boundaries. An original frequency analysis shows that there is no sys tematic change in dominant Frequencies in the turbulent fluidization regime . However, an enrichment of frequency spectra occurs. The signal stochastic analysis by Hurst's method leads to the same conclusion.