Solid Holdup Dynamics of a Step Change in Liquid Fluidization Velocity within a Liquid-Solid Fluidized Bed

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  • Li Di
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University
  • Mizuta Kei
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University
  • Ishihata Kazuki
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University
  • Kamiya Toshihiko
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University
  • Shirai Hidetomo
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University
  • Matsumoto Toshitatsu
    Department of Applied Chemistry and Chemical Engineering, Kagoshima University

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The dynamic response of the solid holdup of single- and two-sized particle systems with a step increase and decrease in the liquid fluidization velocity within a vertical column were experimentally investigated using sieved spherical glass beads with average diameters of 166, 225, and 511 μm. Regardless of the particle size and the magnitude of change in liquid fluidization velocity, a similar tendency was observed with regard to the transition of solid holdup profiles between the initial and the final steady state of the particles in a single-sized system. Further, the behaviors of larger particles in a two-sized particle system were found to be almost the same as those in a single-sized particle system, though the smaller particles in a two-sized particle system showed complex behaviors which were greatly differed from those in a single-sized particle system.<BR>Simple mathematical models have been also developed in this regard. In the models, the particle velocities calculated by the void functions of steady state were combined with the continuity equation of the solid phase including the diffused flux. Under the current experimental conditions, the diffusion coefficients were regarded constant in the axial direction within the process, and they only depended on the initial and final superficial liquid velocity and the diameter of the particle.

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