Question: A 3-ft diameter CSTR is equipped with a 1-ft diameter flflat-blade tur bine. At 300 rpm the reactor yields the desired result. A batch reaction

A 3-ft diameter CSTR is equipped with a 1-ft diameter flflat-blade tur

bine. At 300 rpm the reactor yields the desired result. A batch reaction is carried

out in the reactor and the reaction time is the most critical factor for the operation.

The same reaction is to be carried out in a 8-ft diameter reactor with a 3-ft diameter

turbine impeller.

(a) What rotational speed will give the same blending time?

(b) What will be ratio of power requirement per unit volume for the two reactors?

Note: For this case, the D

a

D

t

ratio is not the same. So you cannot use ntT = constant

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