Characteristics of large two-dimensional air bubbles in liquids and in three-phase fluidised beds

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Abstract

The rising velocity, included angle and wake size of large single air bubbles have been measured in a two-dimensional column, 39.5 cm wide and 112 cm high, which contained a liquid or three-phase fluidised bed. The liquids used were water, 82% w/w aqueous glycerol, 90% w/w aqueous glycerol and methanol The fluidised beds consisted of glass beads with diameters 0.2 mm, 1 mm and 3 mm, fluidised by water. Bed porosities varied between 0.5 and 0.75. In all the liquids and fluidised beds, except 3 mm fluidised particles, bubble velocities werefound to be proportional to the square root of the radius of curvature of the circular cap. The included angle of the cap increased as the viscosity of the liquid increased.

Bubble shapes were used to estimate an apparent viscosity for the fluidised beds which varied from 0.12 to 3.1O P.

References (19)

  • G.R. Rigby

    Chem. Eng. Sci.

    (1970)
  • J.R. Grace et al.

    Chem. Eng. Sci.

    (1967)
  • P.S.B. Stewart et al.

    Chem. Eng. Sci.

    (1964)
  • K. Østergaard

    Chem. Eng. Sci.

    (1965)
  • I. Slaughter et al.

    Chem. Eng. Sci.

    (1968)
  • R. Collins

    Chem. Eng. Sci.

    (1965)
  • J.F. Davidson et al.
    (1963)
  • L. Massimilla

    Brit. Chem. Eng.

    (1961)
  • R.M. Davies et al.

    Proc. Roy. Soc. A

    (1950)
There are more references available in the full text version of this article.

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