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 ∝ Re0.0

C. Po ∝ Re0.5

D. Po ∝ Re1.0

Answer: Option B

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