An experimental investigation of head loss through a triangular “V- shaped” screen

Zayed, Mahmoud; Molla, Anas El; Sallah, Mohammed

doi:10.1016/j.jare.2017.12.005

Cited by 15 publications

(9 citation statements)

References 17 publications

(15 reference statements)

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“…The channel was 16.22 m long, 0.42 m deep, and 0.6 m wide. The experimental equipment has been described in greater detail in Zayed et al (2018aZayed et al ( , 2018b.…”

Section: Methodsmentioning

confidence: 99%

Effect of blocked trash rack on open channel infrastructure

Zayed

Farouk

2020

Water Practice and Technology

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Rack clogging can produce dramatic changes in channel hydraulics. Previous studies have investigated the hydraulics of trash racks for various parameters, but the methodology and the findings were not sufficiently refined. Free-surface depression has also been neglected so far. This study considers the rack blockages as impermeable and box-shaped accumulations (instead of considering their bar thicknesses or spacings) for the hydraulic conditions. Hence, flume experiments were performed to clarify the impact of the governing variables on the rack head loss and to examine the characteristics of free-surface depression (i.e., the length of free-surface depression and maximum depth of the depression) because of predefined blockage ratios. The results prove that the rack head loss and flow turbulence behind the rack mainly depend on the rack blockage and Froude number. However, the results for the blockage ratio ≤0.13 at the approach Froude number ≤0.12 has a minor effect on the resulting rack head loss; therefore, the effects are negligible. This study proposed design equations that determine the rack head loss, length of free-surface depression, and maximum depth of the depression behind the rack because of the box-shaped accumulation body that could be used by water engineers. Furthermore, the study improves upon the process understanding of rack blockages to avoid the potential hazards of open channel infrastructure.

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“…The channel was 16.22 m long, 0.42 m deep, and 0.6 m wide. The experimental equipment has been described in greater detail in Zayed et al (2018aZayed et al ( , 2018b.…”

Section: Methodsmentioning

confidence: 99%

Effect of blocked trash rack on open channel infrastructure

Zayed

Farouk

2020

Water Practice and Technology

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“…In research [29] laboratory analysis was using the screen as a triangle V-shape with different angles, blockage ratios and circular bars to improve the performance of traditional screen walls that are exposed to problems of blockage opening and cause economic and environmental issues. The analysis also included the use of blockage ratios and expenses that are tested using a physical model.…”

Section: Applications Studiesmentioning

confidence: 99%

The Effect of Screen Wall on Flow Energy Dissipation: A Review

Obaida¹,

Khatab²,

Mohammed³

2022

adeletters

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Several studies indicate that using hydraulic structure results in some adverse effects that affect the stability of these structures, including scouring the floor. Many researchers resorted to using defensive means to reduce the flow’s speed and energy as much as possible. One of these means is the use of screen walls. Therefore, the current study focused on reviewing different types of research that dealt with the help of screen walls by changing the location of the screen and geometric shape, such as the diameter of the holes, thickness of the screen wall, porosity, changing the geometric arrangement of the gaps such as the square, triangle and hexagon, as well as the use of a screen inclined at a certain angle, use of triangular meshes and use Artificial intelligence programs to simulate and compare results.

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“…The continuous hazards due to screen clogging in hydroelectric plants and turbines caused significant head loss, resulting in reduced operational efficiency or fatal operational failure. Several experimental research on-screen performances under various screen blockage instances have been carried out e.g., [2,3,4,5,6,7], and flow pattern variations caused by screen blockage results in an intensifies screen head losses, leading to a less hydraulically efficient inlet condition. The efficiency of screen blockage typically has a substantial impact on a variety of societal facets, including vital domains like infrastructure, the built environment, and economic activity.…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of screen blockage typically has a substantial impact on a variety of societal facets, including vital domains like infrastructure, the built environment, and economic activity. Moreover, it is essential to conduct a comprehensive assessment of hydraulic head loss in the design of trash screens [8,9,4] This is crucial due to the potential risks associated with an increasing head loss across the screen. Hence, the structural design of the inlet screen holds paramount importance, as intake conditions can significantly influence both the effectiveness of hydraulic operations and associated financial outlays.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of interaction of turbulent flow with trash screen in open channels

Kokkiligadda,

Dhar,

Reddy Hanmaiahgari

2024

J. Phys.: Conf. Ser.

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Trash screens are widely employed at the entrance of hydraulic structures, water intakes, and pumping stations to trap flowing debris that could exasperate downstream troubles. The characteristics of the vertical trash screen flow are measured using a Three-Dimensional Acoustic Doppler Velocimetry instrument for different flow conditions. The governing equations of the flow are numerically solved using k–ω SST, k–ϵ STD, k–ϵ RNG, and Reynolds Stress Model (RSM) and Large Eddy Simulations (LES). ANSYS-Fluent is used for these numerical simulations. The free surface of the vertical trash screen flow is computed by the volume of fluid method. The Grid Convergence Index is used to analyze the impact of the chosen grid structure on the numerical results. Experimental measurements of the velocity field and free surface profiles are compared with the numerical results of 3D simulations for validation. This study aims to identify the behavior of flow through screens in more detail through experimental and numerical simulations. The computed flow profiles considering all five cases agree well with the measured profile, whereas streamwise velocity in most portions of the flow, the k-ω SST outperforms the other models, and the RSM turbulence model is the second most effective.

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An experimental investigation of head loss through a triangular “V- shaped” screen

Abstract: Graphical abstract

Cited by 15 publications

References 17 publications

Effect of blocked trash rack on open channel infrastructure

Effect of blocked trash rack on open channel infrastructure

The Effect of Screen Wall on Flow Energy Dissipation: A Review

Numerical modeling of interaction of turbulent flow with trash screen in open channels

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An experimental investigation of head loss through a triangular “V- shaped” screen

Abstract: Graphical abstract

Cited by 15 publications

References 17 publications

Effect of blocked trash rack on open channel infrastructure

Effect of blocked trash rack on open channel infrastructure

The Effect of Screen Wall on Flow Energy Dissipation: A Review​

Numerical modeling of interaction of turbulent flow with trash screen in open channels

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Product

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The Effect of Screen Wall on Flow Energy Dissipation: A Review