J. Phys. II France
Volume 5, Number 12, December 1995
Page(s) 1883 - 1899
DOI: 10.1051/jp2:1995218
J. Phys. II France 5 (1995) 1883-1899

Noise/Chaos Distinction Applied to the Study of a Fluidized Bed

N. Letaief, C. Rozé and G. Gouesbet

LESP URA CNRS 230-CORIA, INSA de Rouen, BP08, 76131 Mont-Saint-Aignan Cedex, France

(Received 4 August 1995, revised 1 February 1995, accepted in final form 18 August 1995)

The observation of chaos in fluidization have been claimed by some authors. We analyze the dynamics of a gas-solid fluidized bed and demonstrate that the dynamics is not chaotic but noisy. The random process is studied by using the Hurst analysis in order to look for long-term correlations in the signals. The dynamics may then be modelled by a fractal Brownian motion process.

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