If the micromixing time-scales need to prioritized, the feed points could be brought closer to the impellers . Considering that the turbulence dissipation rates are highest at the impeller discharges , it could also be expected that a multi-impeller vessel should have a more homogeneous distribution of turbulence dissipation and thus more homogeneous mass transfer characteristics. Hence, a multi-impeller tank with an optimal multi-point feed might be comparable or even superior to a single-impeller vessel in both micro-and macromixing terms, but experimental verification is needed.