For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as_________________?
Correct answer: D. Np ∝ 1/NRe
- A. Np ∝ NRe
- B. Np ∝ √NRe
- C. Np → constant
- D. Np ∝ 1/NRe
Explanation
In the laminar agitation regime, power number follows an inverse relationship with Reynolds number, approximately Np = K/NRe. Thus Np decreases as NRe increases.
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