Impingement of circular turbulent jets on rough boundaries

Rajaratnam, N.; Mazurek, Kerry A.

doi:10.1080/00221680509500388

Cited by 31 publications

(29 citation statements)

References 5 publications

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“…The parameters jet height, jet velocity, and jet diameters are frequently reported in literature by various investigators viz. Mih and Kabir (1983), Ansari et al (2003), Rajaratnam and Mazurek (2005), Yeh et al (2009), etc. to study the process of scour in cohesionless and cohesive sediments. These variables are needed to adjudge the stability of hydraulic structures like bucket type spillways, hydraulic jump type stilling basins, etc.…”

Section: Methodsmentioning

confidence: 96%

“…non cohesive and cohesive sediment, jet velocity, diameter of nozzle. The significant fundamental works and the problem of sediment bed response due to submerged water jets have been investigated by a number of researchers including those of Doddiah et al (1953); Moore and Masch (1962), Sarma (1967), Westrich and Kobus (1973), Altinbilek and Okyay (1973), Rajaratnam and Beltaos (1977), Rajaratnam (1982), Rajaratnam and Mazurek (1981, 2005, 2006. Moore and Masch (1962) made a series of tests using a vertical submerged round impinging water jet to estimate the relative scour resistance of remolded and natural sediments.…”

Section: Literature Reviewmentioning

confidence: 98%

“…They found that the dynamic scour depth is about three times of static scour at the equilibrium state. Rajaratnam and Mazurek (2005) conducted laboratory experiment in a circular air jet impinging on smooth walls having air jet nozzle diameter of 6.4 and 12.7 mm in a cylindrical plenum, with the air regulated by the compressed air arrangement. The velocity at the nozzle varies from 45 to 90 m/s.…”

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Scour under submerged circular vertical jets in cohesionless sediments

Chakravarti

Jain²,

Kothyari

2013

ISH Journal of Hydraulic Engineering

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The results of an experimental study on scour under submerged circular vertical jets of water in cohesionless sediments are presented. The laboratory experiments were carried out to investigate the response of gravel beds to the action of vertical submerged water jets. Eight experimental runs were conducted to know the behavior of scour process under submerged vertical jet. The experiments involved various jet diameters and jet heights from the bed level. Measurements were made for both maximum dynamic and static scour depths of the scour hole. It was found that the dynamic scour depth is much larger than the static scour depth at the asymptotic state. The temporal variations of scour depth and maximum static scour depth have been quantified.

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Section: Methodsmentioning

confidence: 96%

Section: Literature Reviewmentioning

confidence: 98%

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Scour under submerged circular vertical jets in cohesionless sediments

Chakravarti

Jain²,

Kothyari

2013

ISH Journal of Hydraulic Engineering

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“…For the case of a single unconfined jet impinging on a flat surface, most authors mention three main regions: free jet region, stagnation region and wall jet region [1], [3], [13]. For the array of two circular jets, each jet first develops as a free jet after emerging, then enters its stagnation region, close to the solid wall.…”

Section: Theoretical Aspectsmentioning

confidence: 99%

Study of an array of two circular jets impinging on a flat surface

2018

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Abstract.In this study, the flow characteristics of an array of two circular, laminar air jets impinging on a smooth solid wall are experimentally and numerically investigated. Direct visualizations using high speed/resolution camera are performed. The evolution of the vortical structures in the area where the jet is deflected from axial to radial direction is emphasized, as well as the interaction between the two jets. A set of CFD numerical simulations in 2D flow domains are performed by using the commercial software Fluent, in the context of Reynolds-averaged Navier-Stokes (RANS) modeling. The numerical resultsare compared and validated with the experiments. The vorticity number is computed and plotted at two different positions from the jet nozzle, and a study of its distribution gives a clue on how the jets are interacting with each other in the proximity of the solid wall.

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“…Verhoff [26] and Rajaratnam [27] presented the empirical formula of the relationship between the maximum profile velocity and the outlet velocity. Rajaratnam also studied the entrainment velocity in the free mixing zone and the effects of the surface roughness on the thickness of the boundary layer.…”

Section: Diffusion Angle Of the Confined Wall Jetmentioning

confidence: 99%

The Effects of Fluid Viscosity on the Orifice Rotameter

Jiang

Zhang

et al. 2016

Measurement Science Review

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Due to the viscous shear stress, there is an obvious error between the real flow rate and the rotameter indication for measuring viscous fluid medium. At 50 cSt the maximum error of DN40 orifice rotameter is up to 35 %. The fluid viscosity effects on the orifice rotameter are investigated using experimental and theoretical models. Wall jet and concentric annulus laminar theories were adapted to study the influence of viscosity. And a new formula is obtained for calculating the flow rate of viscous fluid. The experimental data were analyzed and compared with the calculated results. At high viscosity the maximum theoretical results error is 6.3 %, indicating that the proposed measurement model has very good applicability.

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Impingement of circular turbulent jets on rough boundaries

Cited by 31 publications

References 5 publications

Scour under submerged circular vertical jets in cohesionless sediments

Scour under submerged circular vertical jets in cohesionless sediments

Study of an array of two circular jets impinging on a flat surface

The Effects of Fluid Viscosity on the Orifice Rotameter

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