Question $8$

If a scale$-$up of the tank in Question $7$ was conducted $($Geometric similarity, kinematic similarity and dynamic similarity hold$),$ and the scaled up tank impeller was $3$ times the size of the pilot impeller $($Assume both tank have $6$ baffles$),$

a$)$ Calculate the power required.

b$)$ If time taken for mixing in the pilot scale was $1$ minute, what would the time be in the scaled$-$up tank$?$

Refer to FIGURE $7\mathrm{.}7$ in Coulson and Richardson's $($page $289)$