At low Reynold's number, the power ( P ) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: P o = ?/? N 3 D 5 : Power number Re = ? N D 2 /?: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

At low Reynold's number, the power ( P ) required for agitating a flui

1.	At low Reynold's number, the power ( P ) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: P o = ?/? N 3 D 5 : Power number Re = ? N D 2 /?: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.
A.	P o ? Re -1.0
B.	P o ? Re 0.0
C.	P o ? Re 0.5
D.	P o ? Re 1.0
Answer» C. P o ? Re 0.5

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