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Friction factor for fluid flow in pipe does not depend upon the


1. pipe length
2. pipe roughness
3. fluid density & viscosity
4. mass flow rate of fluid 

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Correct Answer - Option 1 : pipe length

Darcy Weisbach Equation for friction losses in circular pipe:

\({h_f} = \frac{{f \times L \times {V^2}}}{{2 \times g \times D}}\)

where

L = length of the pipe, D = diameter of the circular pipe, V = mean velocity of the flow,

f = Darcy’s friction factor = 4 × F’, F’ = coefficient of friction

hf = head loss due to friction

For Laminar Flow

Friction Factor \(f = \frac{{64}}{{{R_e}}}\;\)

For Turbulent flow 

\(f = \frac{{0.316}}{{R_e^{\frac{1}{4}}}}\)

Points to remember:

The friction factor depends on the roughness of the pipe in case of turbulent flow.

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