Light transmission and effective light absorption in dispersions of small bubbles.

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  • Tomida Tahei
    Department of Chemical Science and Technology, The University of Tokushima
  • Kubo Masahiro
    Department of Chemical Science and Technology, The University of Tokushima

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  • 微小気泡分散相における光透過と有効光吸収
  • ビショウ キホウ ブンサンソウ ニ オケル ヒカリ トウカ ト ユウコウ ヒカ

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Abstract

A light beam (wave length 254nm) of 3 mm width was applied to a dispersion of small bubbles through the optical window of a rectangular cell, and the intensity profile of transmitted light throughout the cell was measured with a photocell for 3cm in axial length in steps of 0.3mm length. The effective attenuation coefficient of dispersions of the small bubbles, μe, was evaluated from the observed intensity profiles of transmitted light. However, it was shown that the estimated rate of light absorption using μe was higher than that measured using the photoreduction of potassium ferrioxalate as an actinometer.<BR>The effective light path length calculated from the volumetric rate of light absorption based on a parallel-plate model was correlated with the gas holdup irrespective of the attenuation coefficient of the solution or the diameter of bubbles.<BR>The simple method described here was concluded to be useful for estimating the volumetric rate of light absorption in a small bubble dispersion system.

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