CHARACTERISTICS OF AIR ENTRAINMENT IN HYDRAULIC JUMPS
نویسندگان
چکیده
منابع مشابه
Hydraulic jumps: turbulence and air bubble entrainment
-A free-surface flow can change from a supercritical to subcritical flow with a strong dissipative phenomenon called a hydraulic jump. Herein the progress and development in turbulent hydraulic jumps are reviewed with a focus on hydraulic jumps operating at large Reynolds numbers typically encountered in natural streams and hydraulic structures. The key features of the turbulent hydraulic jumps...
متن کاملAir entrainment and turbulent fluctuations in hydraulic jumps
A hydraulic jump is the sudden transition from a high-velocity impinging flow into a turbulent roller in an open channel. Substantial amounts of air are entrapped at the impingement point, and significant free-surface fluctuations take place above the roller. In the present study, some physical modelling was conducted in a relatively large sized facility. The flow conditions included a wide ran...
متن کاملAir Entrainment and Turbulence in Hydraulic Jumps: Free- Surface Fluctuations and Integral Turbulent Scales
An open channel flow can change from a supercritical to subcritical flow with a strong dissipative process: a hydraulic jump. Herein some new measurements of free-surface fluctuations next to the jump toe and integral turbulent scales in the roller are presented with a focus on turbulent hydraulic jumps with a marked roller. The results highlighted the fluctuating nature of the impingement peri...
متن کاملConvective transport of air bubbles in strong hydraulic jumps
A hydraulic jump is a flow singularity characterised by a significant amount of air entrainment in the shear zone. The air is entrapped at the jump toe that is a discontinuity between the impinging flow and the roller. The impingement point is a source of air bubbles, as well as a source of vorticity. Herein the convective transport of air bubbles in the jump roller is re-visited. Some analytic...
متن کاملModel for polygonal hydraulic jumps.
We propose a phenomenological model for the polygonal hydraulic jumps discovered by Ellegaard and co-workers [Nature (London) 392, 767 (1998); Nonlinearity 12, 1 (1999); Physica B 228, 1 (1996)], based on the known flow structure for the type-II hydraulic jumps with a "roller" (separation eddy) near the free surface in the jump region. The model consists of mass conservation and radial force ba...
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ژورنال
عنوان ژورنال: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
سال: 2015
ISSN: 2185-467X
DOI: 10.2208/jscejhe.71.i_529