Chaos and recurrence analyses of pressure signals from bubbling fluidized beds

Results from chaos and recurrence analyses of pressure signals bubbling fluidized beds are presented in this study. The experiments were performed cylindrical columns having internal diameters 2.5 inches, 4 inches 6 while operating conditions, material properties static bed height held constant. Superficial velocity air at the inlet was varied 2.97 to 5.35 times minimum fluidization each column. test procedure involved randomization replicates estimate measurement uncertainty identify bias if present. split into regions based on dominant physical mechanisms occurring within. Fractal measures evaluated differential data which confirm deterministic chaos. They represent a broad range spatial temporal scales used elucidate multiphase dynamics different sections these columns. Non-linear analysis is hence shown provide more intuition particularly when true scale-up study non-dimensional groups becomes prohibitive.