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: Po = ρ/ρN3 D5 : Power number Re = ρ N D2 /μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter. (A) Po ∝ Re -1.0 (B) Po ∝ Re 0.0 (C) Po ∝ Re 0.5 (D) Po ∝ Re 1.0

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:
Po = ρ/ρN3 D5
: Power number
Re = ρ N D2
/μ: Reynold's number
N is the impeller rotational speed, and D is the impeller diameter.
(A) Po ∝ Re
-1.0
(B) Po ∝ Re
0.0
(C) Po ∝ Re
0.5
(D) Po ∝ Re
1.0
by

1 Answer

Answer :

(B) Po ∝ Re
0.0
(C) Po ∝ Re
0.5
by

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