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Fluid Mechanics
Flow Through Pipes
GATE 2013
Easy

For a Newtonian fluid flowing in a circular pipe under steady state conditions in fully developed laminar flow, the Fanning friction factor is

  • A0.046 Re⁻⁰·²
  • B0.0014 + 0.125/Re⁰·³²
  • 16/Re
  • D24/Re

Explanation

For fully developed laminar flow in a circular pipe, the Fanning friction factor is exactly f=16/Re (a classical exact result from the Hagen-Poiseuille solution). The other options are empirical turbulent-flow correlations (Blasius-type).

Source: GATE CH 2013 (2013)

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