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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) {http://espace.library.uq.edu.au/view.php?pid=UQ:12836}. Web Page: http://www.uq.edu.au/~e2hchans/self_aer.html Contributed By: Hubert Chanson |