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Title: Air entrainment in a hydraulic jump

Description: Hydraulic jumps are commonly experienced in industrial applications and manufacturing processes, as well as in rivers and canals. The hydraulic jump is the sudden transition from a high-velocity open channel flow to a subcritical flow motion. The jump is characterized by a marked roller, some highly turbulent motion with macro-scale vortices, significant kinetic energy dissipation and a bubbly two-phase flow region. In this video, air bubble entrainment is clearly visible in the strong jump roller. The flow conditions were: Fr = 11.2, V = 4.7 m/s d = 17.8 mm, and the channel was 0.5 m wide.

Credits: Hubert Chanson

References: [1] CHANSON, H. (2007). "Bubbly Flow Structure in Hydraulic Jump." European Journal of Mechanics B/Fluids, Vol. 26, No. 3, pp.367-384 (DOI:10.1016/j.euromechflu.2006.08.001) {}.
[2] CHANSON, H., and GUALTIERI, C. (2008). "Similitude and Scale Effects of Air Entrainment in Hydraulic Jumps." Journal of Hydraulic Research, IAHR, Vol. 46, No. 1, pp. 35-44 {}.
[3] MURZYN, F., and CHANSON, H. (2008). "Experimental Assessment of Scale Effects Affecting Two-Phase Flow Properties in Hydraulic Jumps." Experiments in Fluids, Vol. 45, No. 3, pp. 513-521 (DOI: 10.1007/s00348-008-0494-4) {}.
[4] MURZYN, F., and CHANSON, H. (2009). "Two-Phase Flow Measurements in Turbulent Hydraulic Jumps." Chemical Engineering Research and Design, Trans. IChemE, Part A, Vol. 87, No. 6, pp. 789-797 (DOI: 10.1016/j.cherd.2008.12.2003) {}.

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Contributed By: Hubert Chanson

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