Fluid Mechanics for Civil Engineers

Webber, N.B.

doi:10.1201/9781315273426

Cited by 19 publications

(8 citation statements)

References 2 publications

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“…In this work, the primary phase is water (liquid) and the secondary phase is air (gas). The main physical properties are used to observe and describe the matter of the single air and water are tabulated in Table (1) [31].…”

Section: Case Studymentioning

confidence: 99%

Hydrodynamics of single bubble rising through water column using volume of fluid (VOF) method

Hussein¹,

Rashid²,

Hussein³

et al. 2021

Journal of Thermal Engineering

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The importance of air bubble dynamics in liquid is in some phenomena like chemical and biochemical processes in refinery units. The 2D Volume of Fluid (VOF) method together with the CFD technique were employed for simulating. The dynamic meshing technique is used to simulate the hydrodynamics of rising air bubble in liquid water column via the User Defined Function (UDF) code in the C++ environment was developed to evaluate bubble rising through the water column. The rising of air bubble through a stagnant water column has been considered and the influence of column dimension, bubble size, and aspect ratio on the rising velocity characterized is investigated. The obtained results showed that the bubble rising velocity increase with the bubble size and its shapes was transformed from ellipsoidalto-ellipsoidal cap shape. The rising velocity of air bubbles was affected by the column diameter. It was observed that the air bubble moving toward the top of the water column with oscillation for all cases. A good agreement was obtained between the rising velocity predicted in the simulation with that obtained from the literature.

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Section: Case Studymentioning

confidence: 99%

Hydrodynamics of single bubble rising through water column using volume of fluid (VOF) method

Hussein¹,

Rashid²,

Hussein³

et al. 2021

Journal of Thermal Engineering

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“…4 depicts the experimental zone in which the hydraulic structure was located and the velocity time series were measured. The model of the spillway was constructed with Plexiglas and its roughness coefficient n m was equivalent to 0.008 compared to a roughness coefficient of concrete n p equal to 0.014 (Webber, 1971). This ensures that the roughness scale of Re m was equal to 16.6ˑ10 4 for the scaled peak flood flow of the year 2010 and it was large enough to ensure a dynamic similarity between the model and the prototype.…”

Section: Physical Modelmentioning

confidence: 99%

Numerical and physical modeling of water flow over the ogee weir of the new Niedów barrage

Herrera-Granados

Kostecki

2016

Journal of Hydrology and Hydromechanics

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Abstract:In this paper, two-and three-dimensional numerical modeling is applied in order to simulate water flow behavior over the new Niedów barrage in South Poland. The draining capacity of one of the flood alleviation structures (ogee weir) for exploitation and catastrophic conditions was estimated. In addition, the output of the numerical models is compared with experimental data. The experiments demonstrated that the draining capacity of the barrage alleviation scheme is sufficiently designed for catastrophic scenarios if water is flowing under steady flow conditions. Nevertheless, the new cofferdam, which is part of the temporal reconstruction works, is affecting the draining capacity of the whole low-head barrage project.

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“…Since it was considered that gravitational and inertial forces would dominate in the model, the Froude scale (Webber 1971) was adopted, which implies an undistorted model.…”

Section: Model Scalementioning

confidence: 99%

Hydraulic model study of the blowback behaviour of the bottom outlet of the Berg River Dam, South Africa

Bosman

Basson

Bosman

2016

J. S. Afr. Inst. Civ. Eng.

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The Berg River Dam is equipped with the first multi-level draw-off environmental flood release outlet in South Africa and can release flows up to about 200 m3/s. The outlet is controlled by a radial gate at the outlet end, and is protected by a vertical emergency gate near the inlet end. Commissioning tests of the emergency gate in 2008 found that large volumes of air were expelled, instead of the expected air entrainment into the air vent, designed to reduce expected negative pressures in the conduit during emergency gate closure. This paper describes the testing of a 1:14 physical model representing the outlet works of the Berg River Dam to determine the reasons for the unexpected release of air from the outlet work's air vent, as observed in the field during the commissioning tests of the emergency gate in the outlet conduit. Simulations of continuous gate closure on the as-built physical model of the Berg River Dam outlet showed predominant inflow of air into the air vent during emergency gate closure, with intermittent short duration high-speed air releases during the stages of emergency gate openings between 37% and 25% open. The problem was determined to be one of intermittent air blowback from the outlet conduit via the air vent during the latter stage, rather than continuous air release for all stages of the gate opening operation. The cause of the blowback was found to be the constriction of flow due to a reduction in the conduit cross-section at the radial gate chamber located at the downstream end of the outlet conduit.

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Fluid Mechanics for Civil Engineers

Cited by 19 publications

References 2 publications

Hydrodynamics of single bubble rising through water column using volume of fluid (VOF) method

Hydrodynamics of single bubble rising through water column using volume of fluid (VOF) method

Numerical and physical modeling of water flow over the ogee weir of the new Niedów barrage

Hydraulic model study of the blowback behaviour of the bottom outlet of the Berg River Dam, South Africa

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