Author(s): Laura Montano, Stefan Felder
Linked Author(s): Stefan Felder
Keywords: Air-water flow properties, energy dissipation, flow patterns, hydraulic jump, positive slope
Abstract:
Hydraulic jumps occur at the transition from supercritical to subcritical flows. They are characterised by generation of vortices, three-dimensional motions, high turbulence, air entrainment and strong energy dissipation. While there has been considerable research on air-water flows in classical hydraulic jumps in horizontal flat bed, little research has been conducted on air-water flows in hydraulic jumps on slopes. Herein the present study investigated the air-water flow processes and energy dissipation performances of hydraulic jumps on slopes comprising Type B and D jumps. The observations on the jumps on slope are compared with classical hydraulic jumps on horizontal bed with identical Froude and Reynolds numbers providing novel insights into the effects of bed slope upon the flow aeration and energy dissipation processes in hydraulic jumps. The comparison between hydraulic jumps on flat and sloped bed showed distinctive differences in flow patterns and distributions of air-water flow properties providing a better understanding of the connection between flow aeration and energy dissipation. Overall, Type D jumps represented the scenario with lowest energy dissipation and lowest flow aeration among the three jump types, while the classical hydraulic jump was the most efficient. (2633, 83, 374)
Year: 2017