According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, $$l$$ = Length of pipe, v = Velocity of liquid in pipe and d = Diameter of pipe)
A. $$\frac{{{\text{f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$
B. $$\frac{{{\text{f}}l{{\text{v}}^2}}}{{{\text{gd}}}}$$
C. $$\frac{{3{\text{f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$
D. $$\frac{{{\text{4f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$
Answer: Option D
This Question Belongs to Mechanical Engineering >> Hydraulics And Fluid Mechanics In ME
it has mentioned Darcy's coefficient instead of friction factor...so that's why multiplied by 4
How??