Question

Q4

Question 4 a) Derive the Rigid Column Theory of unsteady fluid flow analysis in pipelines. 10 marks b) A 1.75km horizontal pipe, 0.9m in diameter, is supplied by a constant-head tank. The water level in the tank is 15 m above the discharge point of the pipe. The pipe discharges directly into the atmosphere, with the flow controlled by a valve at its end. i. Calculate the pressure rise at the valve for a rigid water column if the valve is closed in 5.0 seconds. You may assume a constant friction factor, f, of 0.0075. 11 marks How does this value compare with that obtained if fully compressible flow conditions were assumed? ii. 4 marks (Total marks available 25)

Answer 1

P:PC c-r ve.0cc.itgel- Paesama.Vr ves Sudden → Newt on',6 tnL Law of motion ㄒ ㄒ Rigid Pipe 7

NoiJ 尸-J2W.PK.z 14663 2. 3845ec o91mc CL

PL Pness.ne γ:允(r) Pyc , c:阪'k:mcca a s : 66 83 61 KN/r A