The propeller in Prob. 9.1 is replaced with a six-blade turbine 400 mm in diameter, and the fluid to be agitated is a pseudoplastic power law liquid having an apparent  viscosity of 15 P when the velocity gradient is 10 s^-1. At what speed should the turbine rotate to deliver 1 kW/m³ of liquid? For this fluid n' = 0.75 and ρ = 950 kg/m³.

Prob. 9.1

A tank 1.2 m in diameter and 2 m high is filled to a depth of 1.2 m with a latex having a viscosity of 10 P 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 1:1 (pitch equals diameter). The motor available develops 8 kW. Is the motor adequate to drive this agitator at a speed of 800 r/min?