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Gas phase hydrodynamics in a surface-aerated tank with a long-short blades agitator

This work aims to study the gas phase hydrodynamics in a stirred tank
with a surface-aerated long-short blades agitator by the
Eulerian‒Eulerian approach coupled with population balance model.
Predicted local gas holdup and bubble size distribution agree well with
those measured by a conductivity probe technique. The predictions
demonstrate that the pressure depression in the center is the main
driving force for gas suction and the downward flow carries the bubbles
down to redistribute in the whole tank. The gas phase has higher gas
holdup with large bubble size in the upper part and lower gas holdup but
with small bubble size in the lower part of the tank. The predicted
gas-liquid mass transfer coefficients agree well with our previous
experimental results and just depends on the power consumption per unit
volume when the aspect ratio of the liquid height to the tank diameter
varies from 1.1 to 2.0.