The Variable-Voidage Effect on Modeling the Minimum Liquid Fluidization Velocity of Gas-Liquid Fluidized Beds

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  • Lee Donghyun
    Department of Chemical Engineering, SungKyunKwan University
  • Epstein Norman
    Deptartment of Chemical and Biological Engineering, University of British Columbia
  • Grace John R.
    Deptartment of Chemical and Biological Engineering, University of British Columbia

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  • The Variable-Voidage Effect on Modeling the Minimum Liquid Fluidization Velocity of Gas-Liquid Fluidized Beds(SC)
  • Variable Voidage Effect on Modeling the Minimum Liquid Fluidization Velocity of Gas Liquid Fluidized Beds SC

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Abstract

By taking account of the experimentally determined variation of voidage with the gas velocity at minimum gas-liquid fluidization of a bed of solid particles, it is shown, using the same experimental database as in the earlier paper by Lee et al. (2001a), that the model which best predicts the minimum liquid fluidization velocity is a variant of the gas-perturbed liquid model of Zhang et al. (1995), but with the buoyancy term based on the gas-liquid mixture rather than the liquid alone. The best value of the constant in the viscous term of the Carman–Ergun drag equation involved is 165, intermediate between Carman’s 180 and Ergun’s 150.

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