The loss of head due to friction according to Darcy's formula is _____________________?
Correct answer: B. 4fLv2/2gd
- A. 4fLv2/gd
- B. 4fLv2/2gd
- C. 4fLv/gd
- D. 4fLv/2gd
Explanation
Darcy-Weisbach loss is h_f = 4f(L/D)(v²/2g) when f is the commonly used Fanning friction factor; this is option b. If f is defined as the Darcy friction factor, the leading 4 is omitted, so the friction-factor convention matters.
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