Abstract
The present study investigates the intensification of gas dispersion in non-Newtonian fluids using a coaxial mixer comprised of two pitched blade impellers and an anchor. The gas holdup was assessed for this aerated coaxial mixing system via electrical resistance tomography and computational fluid dynamics (CFD). The investigation aimed to find the effects of the impellers’ speed, fluid rheology, impeller pumping direction, rotational mode, and gas flow rate on the aeration efficiency of the coaxial mixers. It was found that the downward pumping and co-rotating mode of the impellers resulted in having the highest gas holdup. Moreover, the anchor speed of 10 rpm generated the highest gas holdup in downward pumping mode at a constant specific power consumption under all the aeration rates. In upward pumping system, the CFD simulations confirmed the results of experiment showing that the anchor rotation deteriorated the gas circulation inside the tank resulting in a lower gas holdup compared to that achieved without anchor. The superiority of the downward pumping and co-rotating mode was demonstrated by comparing the efficiency of different configurations in terms of gas holdup per specific power consumption. Empirical correlations for the gas holdup were developed for the configuration with the highest efficiency.
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