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Chaotic Time Series Analysis of Pressure Fluctuation Signals in a Fluidized Bed Evaporator of Natural Circulation

In this study, the fluidized bed evaporator of natural circulation with different the holdup of solid particle are experimental studied. The holdup of solid particle, pressure fluctuation signals and heat flux are measured. Analyses of chaotic time series on pressure fluctuation signals are conducted to determine the relationship between chaotic characterizations parameter. The values of Kolmogorov entropy are positive and finite, and the values of correlation dimension are from 1.0 to 2.2. The analysis results indicate that the physical parameter fluctuations of the system with the FBENC are chaotic. In the estimations of chaotic invariants including correlation dimension, Kolmogorov entropy and Lyapunov exponent at the same given operation condition, the multi-value phenomena are found. The phenomenon reflects the multi-scale behavior occurred in such multi-phase flow boiling systems.