Question

Q4: a- The figure shown is the setup for testing the gate valve of 8 mm nominal 5 diameter. If 12 Liter of water were collected in two minutes, and the mercury manometer reading [X]is 150mm. Find the loss coefficient K, for gate valve. b- Is the flow Jaminar or turbulent Water Re= PVD Solution : M Mercury t= 2x60=1205 Che sky 12 5- a= Votume = 120=0.1 d=8 nimme =8x103 o r=4x103m Gate Valve

Answer 1

Given d= 8 mm Q = 12 lit in 2 min 6 LPM bL = 150 mm (Hg) hL= 150x 13.6 mm cwarer) A = 2 = 50-26 mm?/s $ = 6eP m = IX105 mm/s 1.989 X 10 mms m/s = 1.989 m SVD 1000 X 1.989x 0-008 %3D Re = IX 10 3 M @ 20c = IX10 Pa-s 4 >4000 1.59x10 Re = ur bul@nt is Flow hi Kv2 29 KX 1.989 2x9.81 150x 13-6 %3D 1000 10.11