POWER CORRELATION FOR PITCHED BLADE PADDL E IMPELLER IN AGITATED VESSELS WITH AND WITHOUT BAFFLES

The power consumption for a pitched blade paddle impeller in both baff led and non -baffled agitated vessels was measured over a wide range o f Reynolds numbers from laminar to turbulent flow regimes. Power consu mption for a non-baffled vessel was well correlated with the same corr elation as that for a paddle impeller by modifying the coefficients in the correlation with blade angle. Power consumption in a baffled vess el was also well correlated with a correlation method similar to Kamei 's one for a paddle impeller. The fully-baffled condition and the corr esponding power number were presented by the following equations. (B-w /D) n(b)(0.8) greater than or equal to 0.44N(pmax,0)(0.2) (2 theta/pi) (0.72) N-pmax,N-0 = 8.3 (2 theta/pi)(0.9) (n(p)(0.7)bsin(1.6)theta/d)