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Darcy-Weisbach Head Loss in a Pipe

MediumDarcy-Weisbachhead loss
For a pipe with Darcy friction factor f = 0.02, length L = 100 m, diameter D = 0.20 m, and average velocity V = 2 m/s, what is the Darcy-Weisbach head loss? Use g = 9.81 m/s2.
  1. A0.51 m
  2. B1.02 m
  3. C2.04 m
  4. D4.08 m
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Answer: C. 2.04 m

hf = f(L/D)[V²/(2g)] = 0.02(100/0.20)[2²/(2 × 9.81)] = 2.039 m ≈ 2.04 m. The supplied factor is the Darcy factor, not the Fanning factor.
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