Moody Diagram 0.1 0.09 Transition Region 0.08 0.05 0.04 0.07 0.06 0.03 0.05 0.02 0.015 0.04 0.01 0.005 0.03 Laminar Flow 0.002 64 Re 0.02 0.001 5x10-4 Material E (mm) 0.015 2x10- Concrete, coarne Concrete, new smooth Drawn tubing Glass. Plastic. Perpex Iron, cast Sewers.old Steel, mertar lined Steel, rusted 0.25 0.025 0.0025 0.0025 0.15 3.0 0.1 0.5 0.025 1.0 Complete turbulence 10-4 5x10 0.01 10-5 Steel, structural or forged 2d 5x10-6 Water mains, ol Friction Factor = Smooth Pipe 10-6 111111 10 10 10 10 10 eVd 10 Reynolds Number, Re Friction Factor Relative Pipe Roughness

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Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.1DP
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Problem 3: A turbulent flow in a pipe has a Reynolds number of 200,000. The pipe diameter is 125 mm, and
the surface has the roughness of coarse concrete (use value in table on Moody diagram above for roughness
height). Find the following:
a. The Relative Pipe Roughness (?⁄?): ___________________________________
b. Friction factor read from Moody Diagram: ______________________________
c. Friction factor calculated with an appropriate formula: ____________________

Moody Diagram
0.1
0.09
Transition Region
0.08
0.05
0.04
0.07
0.06
0.03
0.05
0.02
0.015
0.04
0.01
0.005
0.03
Laminar Flow
0.002
64
Re
0.02
0.001
5x10-4
Material
E (mm)
0.015
2x10-
Concrete, coarne
Concrete, new smooth
Drawn tubing
Glass. Plastic. Perpex
Iron, cast
Sewers.old
Steel, mertar lined
Steel, rusted
0.25
0.025
0.0025
0.0025
0.15
3.0
0.1
0.5
0.025
1.0
Complete turbulence
10-4
5x10
0.01
10-5
Steel, structural or forged
2d
5x10-6
Water mains, ol
Friction Factor =
Smooth Pipe
10-6
111111
10
10
10
10
10
eVd
10
Reynolds Number, Re
Friction Factor
Relative Pipe Roughness
Transcribed Image Text:Moody Diagram 0.1 0.09 Transition Region 0.08 0.05 0.04 0.07 0.06 0.03 0.05 0.02 0.015 0.04 0.01 0.005 0.03 Laminar Flow 0.002 64 Re 0.02 0.001 5x10-4 Material E (mm) 0.015 2x10- Concrete, coarne Concrete, new smooth Drawn tubing Glass. Plastic. Perpex Iron, cast Sewers.old Steel, mertar lined Steel, rusted 0.25 0.025 0.0025 0.0025 0.15 3.0 0.1 0.5 0.025 1.0 Complete turbulence 10-4 5x10 0.01 10-5 Steel, structural or forged 2d 5x10-6 Water mains, ol Friction Factor = Smooth Pipe 10-6 111111 10 10 10 10 10 eVd 10 Reynolds Number, Re Friction Factor Relative Pipe Roughness
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