A reaction in which the product forms a crystalline solid has been studied in a 1-ft-diameter pilot-plant reactor equipped with a 4-in. six-blade turbine with curved blades. At stirrer speeds less than 600 r/min, a solid deposit sometimes forms on the bottom, and this condition must be avoided in the commercial reactor. Density of the liquid is 70 lb/ft³; viscosity is 3 cP. 

(a) What is the power consumption in the small reactor, and what is recommended for an 8,000-gal reactor if geometric similarity is preserved? 

(b) How much might the required power be lowered by using a different type of agitator or different geometry?