Question

how do I get the friction factor by given experiment data?

3.0 RESULT Diameter of the smooth pipe, d = 25.4 mm = 0.0254 m Area of smooth pipe, A = urb? (0.6256)2 = 5.067 x 10-*m? Density of water, p = 997 kg/m2 Viscosity, 4 = 0.891 10-3 Experiment B: Head loss due to friction in a smooth pipe. Flowrate, Inlet head (mm) 0 (m/hr) 1 2 3 Outlet head (mm) Average 1 2 3 Time taken to Average collect 5L of water (5) 8.2 14.0 1.3 26.2 26.3 26.3 26.3 8.4 8.1 8.2 1.5 29.8 29.7 29.6 29.7 7.8 7.9 8.0 7.9 12.0 1.8 34.0 33.5 33.2 33.6 7.4 7.5 7.6 7.5 10.0 Experimental value Flowrate, (m/hr) Flowrate, hf (Inlet Velocity, v (m/s) head-Outlet (m/s) head) (m) 3.57x10-4 0.0181 0.704 4.17x10-4 0.0218 0.823 5.0x10-4 0.0257 0.987 Velocity head Friction factor () 0.025 1.3 1.5 0.035 1.8 0.049

Answer 1

Reynold; Re = sud number M 997X 0.704 0.0254 0.891 x 10-3 그 200o8.92 Re > 4000 Turbulent flow when, 3 3x 10°C Re < 105 for smooth pipes. friction factor is ghen by using Blasius equ 0,079 Re 0.25

Date : Page: i for velocity u= 0.704 m/s Re = 2000 8.92 0.079 0.25 Re 0.006642 0.079 (20008.92)0,25 ü) for velocity, v = 0.823 m/s Re Sud M 997 x 0.823 x 0.0254 0.891 X1013 Re 23391.1194 0.079 f 0.079 Reo. 0.23 0.25 (23391.1(94) º f= 0.00 63879

Date: Page: Lü) for velocity, U = 0.987 m/s Re Sud 997 x 0.987 × 0·0254 0.891 x 103 Re 27864, 649 0.079 0,079 Re0.25 (27864.649) 0.23 f = 0.0061145 hy (m) flow rate a (m? (5) velocity, v velocity head (m/s) Friction factor (f) 0.0181 0,704 0.025 10.006642 3.57x104 -Y 0.02 18 0.823 0.035 4,17 x 10 -0.0063879 0.0257 0.987 oong 0.00 6 1145 5.0 xlor