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Abstract
This experimental investigation focuses on the turbulence features of weak hydraulic jumps in rectangular channels for two different approach flow lengths. The turbulent kinetic energy equation includes the turbulence production and dissipation terms, two advection and two turbulent transport terms and the pressure transport term, which could not be measured, however. For jumps with a limited approach flow length, the turbulence production is mostly confined to the shear layer, while for jumps with a longer approach flow length, an additional peak turbulence production region is observed at the near-wall region due to boundary layer separation. The turbulent energy is then transported by the mean flow both towards the free surface and into the downstream direction and is diffused by turbulent processes away from the energetic shear layer towards less energetic regions. Dissipation occurs mostly in the shear layer along the upstream portion of the jump and over most of the flow depth further downstream.
Acknowledgements
The authors wish to thank Escuela de Ingenieria of the Pontificia Universidad Catolica de Chile (PUC) for financial support of the first author during a post-doctoral fellowship and Fondecyt program for its partial support through grant number 11060312. Financial support from Ecos-Conicyt grant C07U01 is also acknowledged. We also thank Prof. Yarko Niño, Universidad de Chile, for sharing the side looking micro-ADV used.