CE 2200 Chapter : Lect 17
Document Summary
Frictional losses: the head losses resulting from friction between the moving water and the walls of the pipe. Minor losses: the head losses resulting from changes in pipe diameter and the cross(sectional area of the flow, pipe bends and fittings (for example valves and junctions). Darcy equation (cid:22)(cid:20)(cid:8)(cid:26)(cid:24) (cid:16)(cid:10)(cid:24)(cid:3)(cid:17)(cid:13) (cid:24)(cid:22)(cid:7)(cid:25)(cid:25) (cid:15)(cid:17)(cid:13)(cid:7)(cid:8) (cid:24) (cid:22)(cid:13)(cid:14)(cid:23)(cid:17)(cid:3)(cid:24) (cid:1)(cid:6) Darcy(weisbach equation (cid:1) to apply darcy(cid:27)s equation we need to determine the friction factor f, which is the complicated part. The steps are as follows: (cid:1) we first need to determine the type of flow which is typically determined from the reynold(cid:27)s number, which rates the type of flow in the pipe: laminar, turbulent or. The reynold(cid:27)s number is a dimensionless number and is calculated as follows: Where: d= diameter of pipe; v = velocity; = kinematic (cid:3)(cid:7) (cid:3)(cid:7) = L: thickness of the laminar sublayer = 11. 6 /u* ks: equivalent sand roughness of the wall.
