A Numerical Model for Bubble Size Distribution in Turbulent Gas-Liquid Dispersion

MAK Azad, Sultana R Syeda


In present study a numerical model for bubble size distribution is developed that considers both
breakage and coalescence in turbulent gas liquid dispersion. Two-step mechanisms are considered for
both breakage and coalescence of bubbles. The bubble breakage is structured as the product of the
bubble-eddy collision frequency and breakage efficiency in gas-liquid dispersions. The coalescence
function considers the product of bubble-bubble collision frequency and coalescence efficiency. The
model overcomes several limitations observed in previous efforts such as empirical parameters,
narrow range of operating conditions, and narrow range of geometries. Favorable agreement is found
between the predicted bubble size distribution and the experimental data reported in the literature. The
percentage of error obtained for the average bubble size was found within ± 17%.

Journal of Chemical Engineering Vol.ChE 24 2006 25-34


gas-liquid dispersion

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DOI: http://dx.doi.org/10.3329/jce.v24i0.5580