Abstract
An induced gas flotation (IGF) machine is a water treatment machine used in the water treatment process of plant industries such as oil sands and chemical plants. In general, the bubble pattern formed by the rotor and stator inside the IGF is difficult to predict since the recirculation flow and the turbulent flow region are widely formed by the rotation of the rotor. In order to enhance the accuracy of the bubbly flow inside the IGF, the MUltiple-SIze-Group (MUSIG) model, which can address the spontaneous assembly of air bubbles such as bubble coalescence, is applied in this study. Numerical analysis with the rotor configuration on the flotation performance was then carried out using a commercial code, ANSYS CFX. Multiphase flow characteristics in forced air mechanically stirred with a Dorr-Oliver flotation cell were considered. In addition, the flotation performance was evaluated based on the results of flow fields, such as the void fraction, the power consumption, the air residence time, the mean air bubble diameter, and the drag coefficient. By comparing the result of each case, the newly designed model of IGF rotor with aspect ratio of 3.36 exhibited the void fraction increased by 41% and power number decreased by 23% than those of the reference model.
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