Iteration Method
William Bober · 2013
The sum of head losses consists of a head loss, hf , in the pipe due to viscous or turbulent effects and minor head losses due to valves, elbows, and pipe entrance and exit losses. The head loss in the pipe is given by h V g L D ff = 2 (12.2) where L is the pipe length (known) D is the pipe diameter (known) f is the friction factor The determination of the friction factor, f, for smooth pipes (an equation for f for rough pipes is given later in this chapter) can be approximated by the following formula [1]: f = − −( . log Re . )1 82 1 6410 (12.3) Figure 12.1 Piping system (no pump).