Question

A farmer wishes to siphon 10°C water from a lake 1200 m from a field positioned a distance of 3 m below the surface of the lake. What size of drawn tubing should be selected if 400 L of water is desired each minute? Use: a. The Moody diagram b. Equation 7.6.31 Neglect all losses except that due to wall friction. Is the exiting kinetic energy also negligible?

Answer 1

And Giren L=1200 m h₂= 3 m = 400 L/minute = 0.4 m² 8 minute æ = AXV = 0.4 60 4D XV N = 0.4x4 607 D2 3 V = 8. ugqx10 D2 he f2v2 28D B = f (1200) (8.488x103 )? D2 2x9.81D 5 P680.77 D 0.02 Let assume } gs 010185 = 680177 D=0.1281 m v= 8.68 x 10 3 CSScanned with CamScanner (0.1201) va som

V = 0.551 mis VD Re ♡ VD 0155 x 0.22 1.31x166 5136674 for drawn tubing = 0.0015 mm -3 0.0015 X10 0.12 24 = a) 11229x105 From moody chart at Restaurant į = 1.299xios P=0:02 means assumption is correll D = 0.124 m b ) ooy 1502 using eguation D = 0.66 1.25 / 2002 ghe 2021475 SScanned with CamScanner

1200 x 1080 2 14.75 =0.66721.51105)"25/1200X 9.8143 oooy 512 +1.31710 0.4 8.4 1200 70 9.8.3 10.127 m KIE v2 = २१ 2 (0.551)? 249.8) = = 010154 g Therefore, the kinetic energy is neglegible جمله CSScanned with CamScanner