Gas-holdup measurements in bubble columns using computed tomography

Authors

  • Sailesh B. Kumar,

    1. Chemical Reaction Engineering Laboratory, Dept. of Chemical Engineering, Washington University, St. Louis, MO 63130
    Current affiliation:
    1. UOP, Riverside, IL
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  • Davood Moslemian,

    1. Chemical Reaction Engineering Laboratory, Dept. of Chemical Engineering, Washington University, St. Louis, MO 63130
    Current affiliation:
    1. Department of Mechanical Engineering, Florida Atlantic University, Boca Raton, FL
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  • Milorad P. Duduković

    Corresponding author
    1. Chemical Reaction Engineering Laboratory, Dept. of Chemical Engineering, Washington University, St. Louis, MO 63130
    • Chemical Reaction Engineering Laboratory, Dept. of Chemical Engineering, Washington University, St. Louis, MO 63130
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Abstract

A computed tomographic scanner was developed for imaging gas-holdup distributions in two-phase flow systems such as bubble columns and fluidized beds. The scanner has been used to study the effects of various operating parameters (such as column diameter, superficial gas velocity, and distributor type) on the gas holdup and its distribution in an air–water bubble column. The experimental investigation shows that the column dimensions have no significant effect on the void fraction when the column diameter is greater than 0.15 m. Differences in the holdup distribution due to the kind of distributor used are significant only at low gas flow rates. Surface tension of the liquid has a profound influence on the gas holdup and its distribution.

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