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Characteristics of Flow around Open Channel 90° Bends with Vanes

Title:

Characteristics of Flow around Open Channel 90° Bends with Vanes

Han, S. S., Ramamurthy, A. S. and Biron, Pascale M. (2011) Characteristics of Flow around Open Channel 90° Bends with Vanes. Journal of Irrigation and Drainage Engineering, 137 (10). pp. 668-676. ISSN 0733-9437

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Official URL: http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.00003...

Abstract

Sharp open channel bends are commonly encountered in hydraulic engineering design. Disturbances such as secondary flows and flow separation caused by the bend may
persist for considerable distances in the downstream channel. A simple way of reducing these disturbances is through the insertion of vertical vanes in the bend section. A Laser Doppler Anemometry (LDA) unit was used to measure the three-dimensional mean and turbulent velocity
components of flow in an experimental rectangular open channel bend. Flow characteristics of the bend with no vane are compared with those of bends having 1 or 3 vertical vanes. The size of the flow separation zone at the inner wall of the bend was determined from dye visualization data
and confirmed using the mean streamwise velocity data. Results show that the vertical vanes are effective in considerably reducing flow separation, intensity of secondary flows and turbulence energy in the downstream channel. Furthermore, energy loss for bends with vanes is slightly less than for the no-vane case.

Divisions:Concordia University > Faculty of Arts and Science > Geography, Planning and Environment
Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Article
Refereed:Yes
Authors:Han, S. S. and Ramamurthy, A. S. and Biron, Pascale M.
Journal or Publication:Journal of Irrigation and Drainage Engineering
Date:2011
Digital Object Identifier (DOI):10.1061/(ASCE)IR.1943-4774.0000337
Keywords:Secondary flows; Flow separation; Vertical vanes; Laser Doppler anemometry; Turbulent kinetic energy; Bend induced energy loss
ID Code:975085
Deposited By: DAVID MACAULAY
Deposited On:07 Jan 2013 20:53
Last Modified:18 Jan 2018 17:39
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