time data for disk impeller is not included in this figure as
complete mixing did not complete in a reasonable duration.
Among the three impellers shown in Fig. 10, the PR30 impeller
performs relatively less effective considering the longest blend
time that it requires.
To investigate the impact of impeller type on the energy
efficiency in the baffled condition, the specific energy (E: J/m3)
required to achieve complete mixing is defined as follows:
E
= P
V
×
tm