where P/V is the specific power consumption (W/m3), and tm
is the time (s) required to reach the homogenous condition
in the laminar systems. The dependence of specific energy
on the impeller type is shown in Fig. 11. It can be seen from
the figure that the A-45PBT4 has smallest E value, and the
other impellers (axial-flow: PR30 and radial-flow: DT6) have
relatively greater E values. This is consistent with the feature
of its lower specific power consumption in destroying IMRs
for Re < Rec, as presented in Fig. 6, Section 3.2. On the other
hand, this implies that the general performance of radial-flow
impeller is similar to that of axial-flow impeller in liquid blending,
in the baffled configuration