Characteristics of power consumption in an agitated vessel with an ''E
GSTAR'' agitator, which has been practically used as a bioreactor, are
clarified experimentally. The power consumption at nonbaffled conditi
on was well correlated with the friction factor and the modified Reyno
lds number, in a similar manner to Kamei et al. (1995) for a paddle im
peller. In this work, the parameter gamma n(p)(0.7)b/H for the paddle
impeller is modified to 1.5 gamma(d/H) (h(d)/d)(0.59) for the EGSTAR a
gitator. The power consumption under baffled conditions was also corre
lated well with the correlation method, similar to Kamei's method. The
fully baffled condition and the corresponding power number for EGSTAR
agitator are presented by the following equations. (B-w/D) n(b)(0.8)
greater than or equal to 0.74 (h(d)/d) (0.12) N-Pmax,N-epsilon = 3.7 (
h(d)/d)(0.59) (1-epsilon)(-1.1).