Q4/ Derive the formula Friction Factor in Terms of Reynolds Number for Smooth Pipes for turbulent flow and for rough pipe, to show the following Eqns. Hint: For the purposes of obtaining the total flow rate, and hence the mean velocity, the logarithmic profile Vz+ A+B Iny+ can be assumed to hold over the whole pipe, because the laminar sublayer is so thin and contributes virtually nothing to the flow. = 1.74 In (Re√√) -0.391, ✓ = -1.737 In (0.260 + 12377) D Ref