(20 points) A 3-ft diameter CSTR is equipped with a 1-ft diameter flat-blade tur

Question

(20 points) A 3-ft diameter CSTR is equipped with a 1-ft diameter flat-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 & ratio is not the same. So you cannot use ntr constant.

Explanation / Answer

a) W1rad=V/r

V= 18288

W=18288/152.4

=120

B) power ratio is 1

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