pipe friction

# pipe friction - HES 2340 Fluid Mechanics 1 1.0 INTRODUCTION...

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HES 2340 Fluid Mechanics 1 1.0 INTRODUCTION The objectives of this experiment are as follow: 1. To demonstrate change in the law of resistance and establishing the critical law value of Re (Reynolds’s number) 2. To determine the relationship between head loss due to fluid friction and velocity for flow of water though bore pipes and also evaluate the theoretical and experimental result. Apparatus Required: 1. Pipe friction apparatus 2. Hydraulic Bench 3. Stop-watch 4. Volumetric measuring cylinder Unit Construction

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HES 2340 Fluid Mechanics 1 2.0 THEORY Head Loss due to Friction Through Pipes For a circular pipe flowing full, the head loss due to friction (mH 2 O) may be calculated from the formula: (3.1) where, L =length of pipe between tappings (m) = 1 m for all pipes d = internal diameter of the pipe (m) u = mean velocity of water through the pipe (m/s) g = 9.81 (acceleration due to gravity, m/s 2 ) f = pipe friction coefficient (British) 4f = λ (American) Having established the value of Reynolds number R e for flow in the pipe, the value of f may be determined from a Moody diagram. (3.2) μ = molecular viscosity = 1.15 x 10 -3 Ns/m 2 at 15°C 1* = density = 999 kg/m 3 at 15 o C A simplified Moody diagram is included in Appendix A.
HES 2340 Fluid Mechanics 1 3.0 SCOPE 3.1 Experiment 2: Head Loss due to Pipe Friction Objective: To confirm the head loss predicted by pipe friction equation associated with flow of water through a smooth bore pipe. Test section: 6mm Smooth Bore Pipe 10mm Smooth Bore Pipe 17mm Smooth Bore Pipe 3.2 Experiment 3: Fluid Friction in a Roughened Pipe Objective: To determine the relationship between fluid friction coefficient and Reynold’s number for flow of water through a pipe having a roughened bore. Test section: 17mm Roughened Bore Pipe

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HES 2340 Fluid Mechanics 1 4.1 Experiment 2: Head Loss due to Pipe Friction Test Section: 6mm Smooth Bore Pipe Table . Result of test section 6mm smooth bore pipe Volume, V (Litre) Time, T (sec) Flow rate, Q (m 3 /s) Pipe Diameter, d (m) Velocity, u (m/s) Reynolds No., Re Head loss, H (mmHg) 9.0 30 3.0 10 -4 0.006 10.61 55301 7 6.0 30 2.0 10 -4 0.006 7.07 36850 7 5.6 30 1.87 10 -4 0.006 6.61 34452 7 Test Section: 10mm Smooth Bore Pipe Table . Result of test section 10mm smooth bore pipe Volume, V (Litre) Time, T (sec) Flow rate, Q (m 3 /s) Pipe Diameter, d (m) Velocity, u (m/s) Reynolds No., Re Head loss, H (mmHg) 24.0 30 8.0 10 -4 0.010 10.19 88520 -111 20.0 30 6.67 10 -4 0.010 8.49 73752 -109 19.0 30 6.33 10 -4 0.010 8.06 70017 -108 Test Section: 17mm Smooth Bore Pipe Table . Result of test section 17mm smooth bore pipe Volume, V (Litre) Time, T (sec) Flow rate, Q (m 3 /s) Pipe Diameter, d (m) Velocity, u (m/s) Reynolds No., Re Head loss, H (mmHg) 39.0 30 1.3 10 -3 0.017 5.73 84620 -122 36.0 30 1.2 10 -3 0.017 5.29 78122 -122 34.0 30 1.13 10 -3 0.017 4.98 73544 -122 Sample Calculations Test Section: 6 mm Smooth Bore Pipe: (a) Volumetric flowrate, Q = = = 3.0 10 -4 m 3 /s
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pipe friction - HES 2340 Fluid Mechanics 1 1.0 INTRODUCTION...

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