Analysis of Turbulent Hydraulic Jump over a Transitional Rough Bed of a Rectangular Channel: Universal Relations

Afzal, Noor; Bushra, A.; Seena, Abu

doi:10.1061/(asce)em.1943-7889.0000294

Cited by 22 publications

(8 citation statements)

References 19 publications

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“…More recently, Bhuiyan, Habibzadeh, Rajaratnam, & Zhu (2011) and Afzal, Bushra, & Seena (2011) conducted a series of experiments on turbulent submerged offset jets and turbulent rough-bed hydraulic jumps. They concluded that the characteristic lengths of a rough-bed hydraulic jump can be derived adopting a modified upstream Froude number.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds

Pagliara

Palermo

2015

Journal of Hydraulic Research

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Hydraulic jumps, which frequently occur in hydraulic structures, have been extensively studied over the last century. However, only a few studies have evaluated hydraulic jumps in flows over rough beds and there are no studies that consider the air entrainment effect on conjugate depths. The current paper reports the results of an experimental investigation of hydraulic jump properties in flows over adverse-sloped rough beds, including the effect of air entrainment. Furthermore, a semi-theoretical predictive relationship is proposed to estimate jump characteristics for a wide range of hydraulic and geometric conditions covering both rough and smooth beds

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Section: Introductionmentioning

confidence: 99%

Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds

Pagliara

Palermo

2015

Journal of Hydraulic Research

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“…Furthermore, they indicated that the values of the bed shear stress coefficient for hydraulic jump on corrugated bed is about 10 times larger than that of a smooth bed and the analysis of velocity profiles specified that the normalized and dimensionless thickness of boundary layer was equal to 0.57 for hydraulic jump on a corrugated bed relative to corresponding value for the simple wall jet. Afzal et al [20] studied hydraulic jump characteristics experimentally over a roughened bed in a rectangular channel. They indicated that in the inner layer the bed roughness has a passive role on imposing the wall shear stress during formation of hydraulic jump in the outer layer.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Torkamanzad

Dalir

Salmasi

et al. 2019

Water

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The present research describes a laboratory study of hydraulic jump in the abrupt asymmetric expansion stilling basin as an energy dissipator by changing the geometry of walls and bed roughness elements. The experiments were carried out in a horizontal flume with 10 m length, 0.5 m width, and 0.5 m depth for a range of the upstream Froude numbers ( F r 1 ) from 5 to 11. Four physical models with expansion ratio of α = 0.33, 0.5, 0.67, and 1 and asymmetry ratio of Δ = 0.16 were installed in the flume and two different heights of roughness elements ( h = 1.4 and 2.8 cm) were also considered. The results indicated that the sequent depth and the jump length as well as the roller length below abrupt asymmetric expansion on the rough bed were decreased in comparison to the same parameters of the jump in a prismatic channel with smooth bed. It was revealed that the roughness elements have the effective role on stabilization of the hydraulic jump location. The analysis of energy dissipation efficiency confirmed that the spatial jump in the abruptly expanded basin with roughened bed was more efficient than classical jump. In order to estimate the hydraulic jump characteristics, empirical relationships associated with expansion ratio of basin walls, relative height of roughness elements and upstream Froude number were proposed based on the experimental data that resulted in preliminary design of an abrupt asymmetric enlarged basin.

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“…Nevertheless [15] carried out a preliminaries studies to think about the instability of Froude numbers (3.8 < F1< 8.5) and Reynold's number (2.1 × 104 < R < 1.6× 105). As indicated by [16], the characterized weirs as a water-driven structure that speaks to a crucial constituent of the framework expecting a pertinent function as a daily existence supporting component for the populace. Furthermore, Egbe and Agunwamba [18] discuss the proposed design and derivation of mathematical procedure for modeling of hydraulic jump in a broad crested weir in an open channel flows.…”

Section: Introductionmentioning

confidence: 99%

Modeling of weir height drop on the slope of the open channel hydraulic jump

Egbe¹,

Agunwamba²

2020

World J. Adv. Eng. Tech. Sci.

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The model design was developed for the alignment and it was utilized to test for various geometrics and stream conditions searching for a low and incentive for RMSE and the response variable. Also, during the alignment half of the exploratory information was set to their coefficients, and the staying set of information was similarly be utilized for confirmation purposes. Utilizing around thirty out of the fifty informational collections created in the research facility dependent on relapse investigation was applied to the non-direct model to decide the constants. The staying twenty informational collections from research centre analyses were utilized for check of the model. The absence of the fittest was utilized likewise to check the request for the proposed relapse model utilizing the water profundity as the response variable. The Froude numbers from the post-pressure driven hop segment from 0.37 to 0.41 (0.37 < Fr3< 0.41), likewise showing that the streams are subcritical. The Froude numbers from the post-pressure driven hop area inside 0.37 to 0.41 (0.37<Fr3 <0.41), this shows the streams are subcritical. The connection between sequent profundity proportion y3//y2 and speed proportion V2/V3 is around - 5024 +1.485 Fr2 with R2 =0.9957 showing that as the sequent profundity proportion and speed proportion expands the inflow Froude number Fr2 additionally increments, the hydraulic jump extended from - 0.001 to 0.001 which gives some vitality progression with an expansion in the pace of release through the flume. The upstream of the flume, the Froude numbers go from 0.038 to 0.052 (0.038 < Fr1 < 0.52), demonstrating that the streams were subcritical and less harm to the channel.

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Analysis of Turbulent Hydraulic Jump over a Transitional Rough Bed of a Rectangular Channel: Universal Relations

Cited by 22 publications

References 19 publications

Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds

Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Modeling of weir height drop on the slope of the open channel hydraulic jump

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