Hydraulics of Rectangular Dropshafts

Chanson, Hubert (2004) Hydraulics of Rectangular Dropshafts. Journal of Irrigation and Drainage Engineering, 130 6: 523-529. doi:10.1061/(ASCE)0733-9437(2004)130:6(523)

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Author Chanson, Hubert
Title Hydraulics of Rectangular Dropshafts
Journal name Journal of Irrigation and Drainage Engineering   Check publisher's open access policy
ISSN 0733-9437
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1061/(ASCE)0733-9437(2004)130:6(523)
Open Access Status File (Author Post-print)
Volume 130
Issue 6
Start page 523
End page 529
Total pages 7
Editor W. Ritter
Place of publication USA
Publisher American Society of Civil Engineers
Language eng
Subject 290802 Water and Sanitary Engineering
290800 Civil Engineering
770502 Land and water management
Abstract A dropshaft is an energy dissipator connecting two channels with a drop in invert elevation. The hydraulics of vertical rectangular shafts was systematically investigated in seven configurations. A particular emphasis was on the effects of shaft pool, outflow direction and drop height, while geometrically-similar shafts (scale 3.1:1) were studied using a Froude similitude. The results demonstrate that rectangular dropshafts with 90 degree outflow are the most efficient energy dissipators. The shaft pool and drop height have little effect on the rate of energy dissipation. Recirculation time results exhibited marked differences between flow regimes and the longest dimensionless residence times were observed at low flow rates. Although basic flow characteristics were similar between model and prototype, observations of dimensionless bubble penetration depths and recirculation times showed some discrepancy highlighting limitations of the Froude similitude for studies of air entrainment and residence times in dropshafts.
Keyword dropshaft hydraulics
energy dissipation
flow recirculation
scale effects
Q-Index Code C1
Institutional Status UQ

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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 19 Aug 2005, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering