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Self-organization and chaos in a fluidized bed

C.S. Daw
Engineering Technology Division
Oak Ridge National Laboratory
Oak Ridge TN 37932-6472

C.E.A. Finney, M. Vasudevan, N.A. van Goor, K. Nguyen, D.D. Bruns
College of Engineering
University of Tennessee
Knoxville TN 37996-2200

E.J. Kostelich
Arizona State University
Tempe AZ 85287

C. Grebogi, E. Ott, J.A. Yorke
University of Maryland
College Park MD 20742

We present experimental evidence that a complex system of particles suspended by upward-moving gas can exhibit low-dimensional bulk behavior. Specifically, we describe large-scale collective particle motion referred to as slugging in an industrial device known as a fluidized bed. As gas flow increases from zero, the bulk motion evolves from a fixed point to periodic oscillations to oscillations intermittently punctuated by "stutters", which become more frequent as the gas flow increases further. At the highest flow tested, the behavior becomes extremely complex ("turbulent").

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Daw CS, Finney CEA, Vasudevan M, Goor NA van, Nguyen K, Bruns DD, Kostelich EJ, Grebogi C, Ott E, Yorke JA (1995). Self-organization and chaos in a fluidized bed. Physical Review Letters 75(12): 2308-2311.
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