Turbulence and Cavity Recirculation in Air-Water Skimming Flows on a Stepped Spillway

Carlos Gonzalez and Hubert Chanson (2008) Turbulence and Cavity Recirculation in Air-Water Skimming Flows on a Stepped Spillway. Journal of Hydraulic Research, 46 1: 65-72. doi:10.1080/00221686.2008.9521843

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Author Carlos Gonzalez
Hubert Chanson
Title Turbulence and Cavity Recirculation in Air-Water Skimming Flows on a Stepped Spillway
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 2008
Year available 2008
Sub-type Article (original research)
DOI 10.1080/00221686.2008.9521843
Open Access Status File (Author Post-print)
Volume 46
Issue 1
Start page 65
End page 72
Total pages 8
Collection year 2008
Language eng
Subject 240000 Physical Sciences
240500 Classical Physics
240502 Fluid Physics
290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
291800 Interdisciplinary Engineering
291803 Turbulent Flows
300100 Soil and Water Sciences
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Abstract Current expertise in air-water turbulent flows on stepped chutes is limited mostly to laboratory experiments at low to moderate Reynolds numbers on chutes with flat horizontal steps. In this study, highly turbulent air-water flows skimming down a large-size stepped chute were investigated with a 1V:2.5H slope. For some experiments, the cavity recirculation was controlled using triangular vanes, or longitudinal ribs, to enhance the interactions between the skimming flow and cavity recirculating region. New experiments were performed with seven configurations. The results demonstrated the strong influence of the vanes on the cavity recirculation patterns and on the air-water flow properties. An increase in flow resistance was observed consistently with maximum rate of energy dissipation achieved with vanes placed in a zigzag pattern.
Keyword stepped spillways
air entrainment
flow resistance
cavity recirculation
physical modelling
skimming flows
turbulence manipulation
energy dissipation
References Andre, S., Boillat, J.L., Schleiss, A.J., Matos, J. (2004). Energy dissipation and hydrodynamic forces of aerated flow over macro-roughness linings for overtopped embankment dams. Proc. Intl Conf. on Hydraulics of Dams and River Structures, Tehran, Iran, Balkema Publ., The Netherlands, 189-196. Boes, R.M. (2000). Scale effects in modelling two-phase stepped spillway flow. Intl Workshop on Hydraulics of Stepped Spillways, Z├╝rich, Switzerland, Balkema Publ., 53-60. Boes, R.M., Hager, W.H. (2003). Two-phase flow characteristics of stepped spillways. Jl of Hyd. Engrg., ASCE, 129(9) 661-670. Discussion: 131(5) 419-429. Chamani, M.R., Rajaratnam, N. (1999). Characteristics of skimming flow over stepped spillways. Jl of Hyd. Engrg., ASCE, 125(4) 361-368. Chanson, H. (2001). The hydraulics of stepped chutes and spillways. Balkema, Lisse, The Netherlands, 418 pages. Chanson, H., Gonzalez, C.A. (2004). Stepped spillways for embankment dams: review, progress and development in overflow hydraulics. Proc. Intl Conf. on Hydraulics of Dams and River Structures, Tehran, Iran, Balkema Publ., The Netherlands, 287-294. Chanson, H., Toombes, L. (2002). Air-water flows down stepped chutes : turbulence and flow structure Observations. Intl Jl of Multiphase Flow, 27(11) 1737-1761. Chanson, H., Yasuda, Y., Ohtsu, I. (2002). Flow resistance in skimming flows and its modelling. Can Jl of Civ. Eng., 29(6) 809-819. Crowe, C., Sommerfield, M., Tsuji, Y. (1998). Multiphase flows with droplets and particles. CRC Press, Boca Raton, USA, 471 pages. Djenidi, L., Elavasaran, R., Antonia, R.A. (1999). The turbulent boundary layer over transverse square cavities. Jl Fluid Mech., 395 271-294. Gonzalez, C.A. (2005).An experimental study of free-surface aeration on embankment stepped chutes. Ph.D. Thesis, Dept. of Civil Engineering, University of Queensland, Brisbane, Australia. Gonzalez, C.A., Chanson, H. (2004a). Interactions between cavity flow and main stream skimming flows: an experimental study. Can Jl of Civ. Eng., 31(1) 33-44. Gonzalez, C.A., Chanson, H. (2004b). Scale effects in moderate slope stepped spillways. experimental studies in air-water flows. Proc. 8th National Conference on Hydraulics in Water Engineering, IEAust., Gold Coast, Australia, H. Chanson and J. Macintosh Ed., 8 pages (CD-ROM). Matos, J. (2001). Onset of skimming flow on stepped spillways. Discussion Jl of Hyd. Engrg., ASCE, 127(6) 519-521. Mochizuki, S., Izawa, A., Osaka, H. (1996). Turbulent drag reduction in a d-type rough wall boundary layer with longitudinal thin ribs placed within traverse grooves higher-order moments and conditional sampling analysis. Trans. JSME Intl Journal,series B, 39(3) 461-469. Mossa, M., Yasuda, Y., Chanson, H (2004). Fluvial, environmental and coastal developments in hydraulic engineering. Balkema, Leiden, The Netherlands, Proc. Intl Workshop on State-of-the-Art Hydraulic Engineering, 16-19 Feb. 2004, Bari, Italy, 248 pages. Ohtsu, I., Yasuda, Y., Takahashi, M. (2004). Flow characteristics of skimming flows in stepped channels. Jl of Hyd. Engrg., ASCE, 130(9) 860-869. Orlandi, P., Leonardi, S., Antonia, R.A. (2006). Turbulent channel flow with either transverse or Longitudinal roughness elements on one wall. Jl of Fluid Mech., 561 279-305. Rajaratnam, N. (1990). Skimming flow in stepped spillways. Jl of Hyd. Engrg., ASCE, 116(4) 587-591. Discussion : 118(1) 111-114. Toombes, L. (2002). Experimental study of air-water flow properties on low-gradient stepped cascades. Ph.D. thesis, Dept of Civil Engineering, The University of Queensland. Yasuda, Y., Chanson, H. (2003). Micro- and macro-scopic study of two-phase flow on a stepped chute. Proc. 30th IAHR Biennial Congress, Thessaloniki, Greece, D 695-702.
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes The full bibliographic details are : GONZALEZ, C.A., and CHANSON, H. (2008). "Turbulence and Cavity Recirculation in Air-Water Skimming Flows on a Stepped Spillway." Journal of Hydraulic Research, IAHR, Vol. 46, No. 1, pp. 65-72 (ISSN 0022-1686).

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Created: Thu, 28 Feb 2008, 08:24:47 EST by Hubert Chanson on behalf of School of Civil Engineering