Q.
What is the formula for head loss due to friction?
Asked by hitler,
01 Jan '10 08:00 pm
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Answers (3)
1.
The Darcy-Weisbach equation with the Moody diagram are considered to be the most accurate model for estimating frictional head loss in steady pipe flow. Since the approach requires a not so efficient trial and error iteration an alternative empirical head loss calculation like the Hazen-Williams equation may be preferred. source: http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html
The stated source gives an online calculator using Hazen -Williams equation. Manning's formula can also be used for gravity driven flows in open channels.
Answered by Somebodysomewhere, 01 Jan '10 08:11 pm
The stated source gives an online calculator using Hazen -Williams equation. Manning's formula can also be used for gravity driven flows in open channels.
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3.
F = 0.2083 (100/c)^1.852 * q^1.852 / dh^4.8655 (1)
where
f = friction head loss in feet of water per 100 feet of pipe (fth20/100 ft pipe)
c = Hazen-Williams roughness constant
q = volume flow (gal/min)
dh = inside hydraulic diameter (inches)
Answered by SHIRISH SHIROOR, 01 Jan '10 08:11 pm
where
f = friction head loss in feet of water per 100 feet of pipe (fth20/100 ft pipe)
c = Hazen-Williams roughness constant
q = volume flow (gal/min)
dh = inside hydraulic diameter (inches)
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