| Recap |
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this course you have learnt the following |
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- The Fanning’s friction
coefficient for a flow through a closed duct,
 in terms of wall
shear stress, and Cf = ( ¼)(Dh/L)ΔP*/(1/2)
ρV2 in terms of piezometric pressure
drop Darcy’s friction factor is defined as f = 4Cf
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- Loss of head in a pipe
flow is expressed in terms of Darcy’s friction factor as
h f = f(L/D)(V2/2g)
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- Friction factor in case
of laminar fully developed flow is found by N-S equation and
is given by f = 64/Re. Friction factor for turbulent
flow depends both on Re and the roughness at pipe surface.
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- Flows, in practice,
takes place through several pipes together either in series
or parallel or in combination of both of them. The
relationship between the head causing the flow ΔH and flow
rate Q can be expressed as ΔH= RQ2, where
R is the flow resistance in the hydraulic path.
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- The loss of head due to
friction over a length L of a pipe. Where the entire flow is
drained off uniformly from the side tappings, becomes 1/3 of
that in a pipe of same length and diameter, but without side
tappings.
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- An additional head loss
over that due to pipe friction takes place in a flow through
pipe bends and pipe fittings like valves, couplings and so
on.
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- The hydraulic power can
be transmitted by a pipeline. For a maximum power
transmission, the head due to friction in the flow equals to
one third of the head at source to be transmitted. The
maximum power transmitted efficiency is 67%.
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Congratulations! you have finished Chapter
11.
To view the next lecture select it from the left hand side menu of the page |
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