Air entrainment in hydraulic structures: a review
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 کاملAn Analysis of changes in hydraulic parameters on water entrainment in converging channels
Building of Dam from thousands of years BC was known, and the humans with use of them alwaystry to preserve and utilize surface water resources, but sedimentation problem always is the mostimportant factor in shortening the useful life of dams , and a lot of reservoirs were filled by sedimentsdue to this process and therefore most of dams have been abandoned. One of the most importantphenomena ...
متن کاملModeling Air Entrainment and Transport in a Hydraulic Jump using Two-Fluid RANS and DES Turbulence Models
Both RaNS (Reynolds-averaged Navier-Stokes) and DES (Detached Eddy Simulation) type turbulence models were used in conjunction with a two-fluid model of bubbly flow and a new subgrid air entrainment model to predict air entrainment and transport in a hydraulic jump. It was found that the void fraction profiles predicted by both methods are in agreement with the experimental data in the lower sh...
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ژورنال
عنوان ژورنال: Maritime Engineering
سال: 2001
ISSN: 1741-7597
DOI: 10.1680/maen.148.4.285.40596