Question

what is the value by using moody chart?

Test section: Rough pipe Test section diameter: 0.0254m πά Area = 5.067x10-4m 4 Water temperature : 27°C Pipe Length im Density at 27°C: 996.59 kg/m3 Dynamic viscosity at 27°C: 0.8509x10-3 Pas Flowrate, e (m^3/h) Velocity(m/s) Velocity head(m) Friction factor Hf(head in- head out) Km) 17.50 17.25 1.4 0.767 10.61 10.08 1.2 0.658 1.0 15.75 0.548 9.73 Roughness: 0.0015.mm Flowrate, HfChead in- (m^3/h) head out) (m) 1.4 5.75 1.2 4.05 Velocity(m/s) Velocity head(m) Friction factor 0.767 10.40 9.89 0.658 1.0 3.65 0.548 9.94

Answer 1

Here I attached MOODY chart to find friction factor and I explained procedure also...if you don't have curve for a particular ratio them you should draw a curve on graph to find friction factor value..

I hope you understand well..

Given that t By using "Moody chast" - we can find "fiction factos f=16 = Laminas Re How Tushulent flow. F a f Klo Ko = Relative Roughness Kp KID= Re ( Reynolds Numbers DXVX Reynolds number (he) = M he= 0.0254 X ? x 996.59 0.8509x103 Here we don't know velocity, but we know that volume metric flow rate (O). For Qal4 m² r ho A=5.067x10 m Q = V.XA toy mo A hr 5.067x10 u me v 2762.97 x Tho 3600sec 0.767 m

DVS 0.0250 X 0.767 X 996.59 Re= 0.8509 x103 Re=22817.4 Re 2.2817 X104 2.38104 NOW Roughness (k)= 0.0005 mm x im 000 man K = 0.001S X163 m Relative hough hers 0.0015 x103 0 = 0.000059 0.02su . = 0.00006 From Moody chart (I attached below). and for a given Reynolds number Re=2.3x104 a given (& ratio= 0.00006), then corresponding frictiona factor If=0.00625.

For Q=1.2 m3 V= 0.658 ms. hool Re= 0:0254 X0.658X996.59 Dus M 0.8509 Xi03 Re=19574.8 Re=1.95748 xiou 2x104... 0.00006 0 From chart y Re=2x104 and à latio = 0.00006. f=0.00 650 For Q=1 m3 ho = v=0.548 OV8 he= 0.0254 x 0.548 x 996.59 0.8509x103 Re=16302.4 Re=1.63204 XIO" At he= 1.6320uxio", fol = 0.00006 , then Cossesponding f= 0.00675 పంపకాల ఉచిత పరపగా

Conclusion Roughness kerge = 0.0015 mm feiction factor Floweate my vebrity &m(s) 0.00625 lou 0.767 1-2 0.658 0.00.650 0.548 36 0.00 675

0.025 Acte 0.020 0.05 0.04 At & 0.015 C Re 0.03 modring afch of 0.0125 --- Laminar flow, 7=761 Re 0.02 0.015 ATO 0.0100 IT 0.01 0.008 0.006 0.004 0.0080 Recr Turbulent flow LOUILLE Fanning friction factor, f 0.0070 Relative roughness, k/D 111 TIT 2 0.0060 Transition region 0.002 0.0050 *prel ........... LUULLULUI LI 0.001 0.0008 0.0006 0.0004 LLLLL ---- 0.0040 Smooth pipes 0.0002 trofalend 1 fo Laminad flow the fit logh hor as per Sia low » friction factor as Rełəft forgiven 0.0030 Material k, ft Drawn tubing Smooth Wrought iron, steel 0.00015 Galvanized iron 0.0005 Cast iron 0.00085 Concrete 0.01-0.001 0.0001 0.000,05 0.0025 k/D = 0.000005 and frosk a forgiven Re. k/D = 0.000001 0.0020 1 2 3 4 5 6 8 1 + 2 3 4 5 6 8.1 2 3 4 5 6 8 } x 104 + X.105. + Reynolds number, Re 2 3 4 5 6 8 1 X 106 * 0.000,01 2 3 4 5 6 8 1 x 107 x 103 CS Scanned with CamScanner FIGURE 5.10 Friction factor plot for circular pipes. [Adapted from L. W. Moody, "Friction Factors for Pipe Flow,” Trans. ASME 66:672 (1944).] Kloratio and in constant