Flow Around 180° Bends in Open Rectangular Channels

by Mostafa M. Soliman,
E. Roy Tinney,

Serial Information: Journal of the Hydraulics Division, 1968, Vol. 94, Issue 4, Pg. 893-908

Document Type: Journal Paper


A theoretical analysis of the head losses occurring in 180○ open channel bends is developed based on the moment of momentum and continuity principles. Experimental data with various flow conditions and several bend geometries are presented to check the theory. Circular arc guide vanes are used as a means of minimizing the total head losses and, on the average, these reduced the losses by 67%. Conditions causing a hydraulic jump immediately downstream from the bend and the means for its elimination are also considered.

Subject Headings: Channel flow | Channel bends | Open channels | Head loss (fluid mechanics) | Geometrics | Vanes | Hydraulic jump | Rivers and streams

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