Pick out the Hagen-Poiseuille‟s equation ?
Correct answer: B. Δp = 32 (μLV/gc. D2)
- A. Δp/ρ = 4f (L/D) (V2/2gc)
- B. Δp = 32 (μLV/gc. D2)
- C. Δp/L = 150 [(1 - ε)/ε3]. (μ.V0
- D. 2/g2cD)
- E. Δp/L = 1.75 [(1 - ε)/ε3]. (ρV0
- F. 2/gcDp)
Explanation
For laminar flow in a circular pipe, Hagen-Poiseuille’s equation is Δp = 32μLV/D² when written in terms of average velocity. The other expressions represent turbulent pipe loss or flow through porous beds.
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