A tank 1.2 m in diameter and 2 m high is filled to a depth of 1.2 m with latex having viscosity of 1 Pa.s and a density of 800 kg/m3 . The tank is not baffled. A three-blade 360- mm-diameter propeller is installed in the tank 360 mm from the bottom. The pitch is 1.5:1. The motor available develops 8 kW.

a) Is the motor adequate to drive this agitator at a speed of 800 rpm?

b) If a propeller 360 mm in diameter turning at 15 rps is used and if four baffles, each 120 mm wide are installed, what is the power required for the mixing operation?