Power Demand and Mixing Performance of Coaxial Mixers in Non-Newtonian Fluids

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All experiments were carried out in a transparent dished bottom stirred tank with the diameter T of 0.48 m and liquid level of 0.6T. The power consumption and mixing performance of a coaxial mixer consisting of a wall-scraping anchor and different inner dispersion impellers (Rushton turbine, 45º pitched blade turbine and CBY) operating in inner impeller-only, co- and counter-rotating modes were experimentally characterized in viscous Non-Newtonian fluids (2% and 3% w/w CMC solutions) with different rheology behaviours. The results show that for the co-rotating modes, the power consumption of the anchor could decrease up to 5% of that for the anchor rotating-only, whereas for the counter-rotating dispersion ones, it could increase 2 times of that for the anchor rotating-only. However, the power consumption of the inner impellers is almost independent of the anchor rotation. We proposed new correlations to give better fitted power curves between the generalized Reynolds number and the power number by considering not only the impeller geometry, the characteristic speed, but also the speed ratio. For each coaxial mixer, one reasonable power curve can be generated for different experimental speed ratios and different rotation mode. Impellers in co-rotating mode are more efficient than the inner impeller-only and the counter-rotating ones in the mixing of the non-Newtonian fluids. Among above three dispersion impellers, the power consumption of the CBY -anchor combination is the lowest compared with those for other two combinations given the similar mixing performance.
社団法人化学工学会の論文
2011-03-01

Power Demand and Mixing Performance of Coaxial Mixers in Non-Newtonian Fluids

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