3. [ Calculate the power required for agitation of water at 21.1C in an unbaffled tank. A three-blade marine type impeller of 0.610m pitch and 0.610m diameter rotates at 100rpm. The tank diameter is 1.83m and the depth of the liquid is 1.83m. The impeller is located 0.610m from the tank bottom. Use the power curves for unbaffled agitator systems shown in the Fig. below. Legend for Fig. below x=haloge Power curves for 3 -blade marine type impellers 86