The head loss due to friction in turbulent flow in a closed section pipe is given by the Darcy equation: v h = 1 = 1 = 29 All the parameters in the above equation, except for the friction factor, f, are measurable. The variables which the value of f depends on are the mean velocity, v of fluid, the diameter, D of pipe, the density, p of fluid, the dynamic viscosity, and the surface roughness, e of the pipe. Express f as a set of dimensionless parameters using p, V, D as the repeating variable.