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VD For Water at 20: Moody Diagram

This document provides information about flow characteristics in pipes and channels. It includes charts showing the relationship between velocity (V), diameter (D), and Reynolds number (Re) for water and air flow. It also shows how the Darcy-Weisbach friction factor (f) varies with relative roughness (ε/D) in fully turbulent flow. Common values of relative roughness are given for various pipe materials.

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Mayckol
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307 views1 page

VD For Water at 20: Moody Diagram

This document provides information about flow characteristics in pipes and channels. It includes charts showing the relationship between velocity (V), diameter (D), and Reynolds number (Re) for water and air flow. It also shows how the Darcy-Weisbach friction factor (f) varies with relative roughness (ε/D) in fully turbulent flow. Common values of relative roughness are given for various pipe materials.

Uploaded by

Mayckol
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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VD for water at 20C (V in m/s, D in cm)

0.06 0.1 0.2 0.4 0.6 0.8 1 2 4 6 8 10 20 40 60 100 200 400 600 1000 2000 4000 6000 10000
|____________________________________________________________________________________________________________________________________________________________________________________________________
| | | | | | | | | | | | | | | | | | | | | | | | | | |
VD for atmospheric air at 20C
1 2 4 6 8 10 20 40 60 100 200 400 600 1000 2000 4000 6000 10000 20000 40000 60000 100000
1 | | | | | | | | | | | | | | | | | | | | | | | | | |
10
__
Laminar Critical Transition zone Complete turbulence, rough pipes, R > 3500/r, 1/f = 1.14 2 log r
9 flow zone
0.07
8
0.06

0.05
7
0.045
0.04
6 0.035
0.03
5.5
0.025
5

Relative roughness r ( in mm, D in mm)


0.02
DarcyWeisbach friction factor f
2hDg

0.0175
LV 2

4.5
0.015
0.0125
4
0.01

3.5 0.008

0.006
3

D

0.004

0.003
2.5
Material (mm)
0.002
Riveted steel 0.99 0.0015
Concrete 0.33
2 Wood stave 0.180.9 0.001
Cast iron 0.25
0.0008
1.8 Galvanized iron 0.15
Asphalted cast iron 0.12 0.0006
Commercial steel 0.046 Smooth pipes, r __= 0
1.6 __ 0.0004
Drawn tubing 0.0015 1/f = 2 log(R f ) 0.8
1.4 Fluid at 20C (m2/s)
0.0002
HagenPoisseuille equation
Water 1.003e006 R 2300, f = 64/R
Air (101.325 kPa) 1.511e005
1.2 0.0001
2 Colebrook equation, R 2300 __
Latitude (WGS84) g (m/s ) __

1/f = 2 log(r /3.7 + 2.51/(R f )) r = 5e006


5e005
10
2 0.0 Sea level 9.78033
45.5 Standard 9.80665 Continuity equation, Q = AV
90.0 Sea level 9.83219 A = D 2/4, V = 4Q /( D 2) 2e005
9
r = 1e006
1e005
8
6 7 8 3 2 3 4 5 6 7 8 4 2 3 4 5 6 7 8 5 2 3 4 5 6 7 8 6 2 3 4 5 6 7 8 7 2 3 4 5 6 7 8 8
10 10 10 10 10 10
VD Metzger & Willard, Inc.
Moody Diagram Reynolds number R (V in m/s, D in m, in m 2/s)
http://www.metzgerwillard.com

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