Air–water low patterns of hydraulic jumps on uniform beds macroroughness

Felder. Stefan and Chanson, Hubert (2017) Air–water low patterns of hydraulic jumps on uniform beds macroroughness. Journal of Hydraulic Engineering, 144 3: . doi:10.1061/(ASCE)HY.1943-7900.0001402

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Author Felder. Stefan
Chanson, Hubert
Title Air–water low patterns of hydraulic jumps on uniform beds macroroughness
Journal name Journal of Hydraulic Engineering   Check publisher's open access policy
ISSN 0733-9429
Publication date 2017-03-01
Year available 2017
Sub-type Article (original research)
DOI 10.1061/(ASCE)HY.1943-7900.0001402
Open Access Status Not yet assessed
Volume 144
Issue 3
Total pages 12
Place of publication Reston, VA United States
Publisher American Society of Civil Engineers
Language eng
Subject 2205 Civil and Structural Engineering
2312 Water Science and Technology
2210 Mechanical Engineering
Abstract Hydraulic jumps are characterized by strong flow turbulence, flow aeration, and three-dimensional flow motions. Whereas comprehensive research into hydraulic jumps on smooth bed has improved the understanding of flow aeration and turbulence, limited research has been done of hydraulic jumps on rough beds. Herein novel experiments were conducted in hydraulic jumps on uniformly-distributed bed macroroughness. Both air-water flow patterns and basic air-water flow properties were investigated. The hydraulic jumps on the rough bed exhibited some remarkable differences compared with smooth bed jumps including some preaeration of the flow upstream of the jump, an upwards shift of the jump roller and a clear water-flow region underneath the jump. Air-water flow measurements were conducted with a phase-detection probe, showing similar distributions of air-water flow properties for the rough and smooth bed jumps. Comparative analyses highlighted some distinctive effects of the bed roughness including an upwards shift of the hydraulic jump and an increase in bubble count rate and void fractions in the region close to the jump toe. In the second half of the hydraulic jumps, the rough bed led to a clear-water region with large-scale vortices which were advected downstream. The present study highlighted the potential that improved and nonstandard invert designs may have for flow manipulations and design enhancements.
Keyword Hydraulic jump
Air-water flow
Energy dissipation
Physical modelling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Open Access file is a preprint of: FELDER, S., and CHANSON, H. (2018). "Air–Water Flow Patterns of Hydraulic Jumps on Uniform Beds Macroroughness." Journal of Hydraulic Engineering, ASCE, Vol. 144, No. 3, Paper 04017068, 12 pages (DOI: 10.1061/(ASCE)HY.1943-7900.0001402) (ISSN 0733-9429).

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Fri, 22 Dec 2017, 10:21:27 EST by Hubert Chanson on behalf of School of Civil Engineering