Research Article
Jul 1978
Size Determination of Partly Full Conduits
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 104, Issue 7
Abstract
The transition from partly full to full pipe (sealing) is accompanied by vibrations of the structure and surging of the flow. The experimental study was done in a 4-in. (100-mm) square conduit with three different circular bends, with various deflectors, and with various concentrations of air. Sealing depends on the Froude number of the flow. To maintain partly full flow, more space is needed above the water-flow area with an increase of Froude number. With short-tube control, the ratio of the radius of curvature along the center line to the bend diameter and the deflector thickness at the crown of the bend determine the water-flow area in the horizontal conduit. Ventilation of the horizontal conduit delays sealing while aeration of the water flow hastens sealing. With weir control, waves on the flow surface hasten sealing and highly aerated flow delays sealing. Ratios of radius of curvature to the bend diameter larger than 2.0 are recommended, since they generate fewer waves.
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Published In
Journal of the Hydraulics Division
Volume 104 • Issue 7 • July 1978
Pages: 959 - 974
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Jul 1978
Published online: Feb 3, 2021
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Authors
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Yusuf G. Mussalli, M.ASCE
Consultant, Environmental Engrg. Div., Stone & Webster Engrg. Corp., Boston, Mass
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.