Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ?
Correct answer: A. f = 0.079.NRe-0.25
- A. f = 0.079.NRe-0.25
- B. f-0.5 = 4.07 loge (NRef)-0.6
- C. Both 'a' and 'b'
- D. None of these
Explanation
The Blasius correlation for the Fanning friction factor in smooth turbulent pipe flow is f = 0.079 Re⁻⁰·²⁵. Other friction-factor forms use different coefficients or implicit logarithmic correlations, so option b is not the Blasius equation.
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