Monitoring of the hydro dynamic instabilities in conical spouted beds by recurrence plot analysis of pressure fluctuations and acoustic emission signals

摘要

The recurrence plot method can be used as a powerful technique for monitoring the hydrodynamics of conical spouted beds. The reconstructed phase space trajectories of both PFs and AE signals approach to a slim and elongated pattern by injection of water into the bed. Changes in the visual appearance of the UTRPs of AE signals are more obvious, even without any quantification analysis. Examination of maximum length of diagonal lines of thresholded RPs (TRPs) showed that PFs and AE signals of the bed approach that of a periodic time series with injection of water. Hydrodynamic behavior of bulk movement and agglomerates is more deterministic than movement of single particles.