The variation of the area of the IMRs as a function of the
power consumption is expressed as a/A vs. (P/V: W/m3) for
different impellers in Fig. 6. Among the impellers, the modified
pitched blade turbine (A-45PBT6) appears to be the most
energy efficient in producing smaller IMRs. In contrast, it is
less efficient to use PR30 and the disk impeller in the viscous
systems since they require a higher power input to for purpose
of minimization of IMRs.