Self‐Aerated Flows on Chutes and Spillways
نویسندگان
چکیده
منابع مشابه
Physical modelling and scale effects of air-water flows on stepped spillways
During the last three decades, the introduction of new construction materials (e.g. RCC (Roller Compacted Concrete), strengthened gabions) has increased the interest for stepped channels and spillways. However stepped chute hydraulics is not simple, because of different flow regimes and importantly because of very-strong interactions between entrained air and turbulence. In this study, new air-...
متن کاملExperimental Study of Turbulence Manipulation in Stepped Spillways. Implications on Flow Resistance in Skimming Flows
Current expertise in air-water turbulent flows on stepped chutes is limited to laboratory experiments at low to moderate Reynolds numbers on flat horizontal steps. In this study, highly turbulent air-water flows skimming down a large-size stepped chute were systematically investigated with a 22o slope. Turbulence manipulation was conducted using vanes or longitudinal ribs to enhance interaction...
متن کاملExperimental and theoretical study of rapid flows of cohesionless granular materials down inclined chutes
A theoretical and experimental study is performed of rapid, fully developed flows of cohesionless granular materials down inclined chutes with a rough base. Two flow types are studied in detail: (1) immature sliding flow, where a stagnant zone forms on the base of the chute, and (2) fully developed sliding flow, where no such zone is formed. A simple phenomenological theory is developed that pr...
متن کاملInvestigation of Cavitation Damage Levels on Spillways
This paper presents a classification of cavitation damage levels on spillway surface. Two important factors influencing cavitation damage have been considered in this study, flow velocity and cavitation index. Based on these factors, five different damage levels from no cavitation damage to major cavitation damage have been determined. The method was applied to data of the Shahid Abbaspour dam ...
متن کاملEnergy dissipation, flow resistance and gas-liquid interfacial area in skimming flows on moderate-slope stepped spillways
With the re-evaluation and revision of a number of design floods, several embankment overtopping protection systems have been developed and a common technique is the construction of a stepped spillway on the downstream slope. For such moderate slope stepped channels, detailed air–water flow measurements were performed in a large facility with a focus on the rate of energy dissipation, flow resi...
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ژورنال
عنوان ژورنال: Journal of Hydraulic Engineering
سال: 1993
ISSN: 0733-9429,1943-7900
DOI: 10.1061/(asce)0733-9429(1993)119:2(220)