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- W4205964400 abstract "Abstract A hydraulic jump is a stationary transition from an upstream supercritical to a downstream subcritical flow. Weak hydraulic jumps may be observed downstream of low-head hydraulic structures and their physical properties were often neglected. In the present study, the hydraulic properties were investigated experimentally in weak hydraulic jumps with an inflow Froude number Fr1 = 2.1 and inflow depths 0.012 m < d1 < 0.130 m. Three novel features were the very wide range of inflow length scales tested systematically, the relatively high Reynolds number Re = 3.05×105 achieved in the largest experiment, and the broad range of inflow conditions. Although no air entrainment was observed at the lowest Reynolds numbers, some distinct air-water flow patterns were observed in the roller region, generally similar to those observed at higher Froude numbers. The ratio of conjugate depths followed closely the analytical solution of the momentum principle irrespective of the inflow depth. However, noticeable scaling issues were observed in terms of the dimensionless roller length, length of air-water flow region, roller toe fluctuation frequency, and rate of air entrainment, with increasing dimensionless data with increasing inflow depths, hence Reynolds numbers. The present results have some practical implication in terms of physical modelling and upscaling of results for low-head hydraulic structures, including culverts and storm waterways, which typically operate with Reynolds numbers in excess of 105." @default.
- W4205964400 created "2022-01-25" @default.
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- W4205964400 date "2022-01-19" @default.
- W4205964400 modified "2023-10-16" @default.
- W4205964400 title "Flow Patterns, Roller Characteristics and Air Entrainment in Weak Hydraulic Jumps: Does Size Matter?" @default.
- W4205964400 doi "https://doi.org/10.1115/1.4053581" @default.
- W4205964400 hasPublicationYear "2022" @default.
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