Local head losses in pipes lecture 4
Local head losses Sample document
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Velocity distribution in open channels
• The measured velocity in an open channel will always vary across the channel section because of
friction along the boundary
• The maximum velocity is found just below the surface. Because of secondary currents which are
circulating from the boundaries towards the section center and resistance at the air water
interface.
Fluid energy and flow in open channels
Flow of water in a conduit may be open channel or pipe flow
Open channel flow must have a conduit while pipe flow has none
A free surface is subject to atmospheric pressure. In pipe flow, there exist no direct atmospheric
pressure but hydraulic pressure only…
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