Mixing in Inclined Dense Jets

Roberts, Philip J. W.; Ferrier, Adrian; Daviero, Gregory J.

doi:10.1061/(asce)0733-9429(1997)123:8(693)

Cited by 167 publications

(116 citation statements)

References 13 publications

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“…Dense jets, being a particular type of negatively buoyant flows, have been studied by several authors, for example [1][2][3][4][5][6][7][8][9][10]. In an early study, Zeitoun et al [11] investigated an inclined jet discharge, focusing on an initial jet angle of 60° because of the relatively high dilution rates achieved for this angle.…”

Section: Background and Previous Studiesmentioning

confidence: 99%

“…In an early study, Zeitoun et al [11] investigated an inclined jet discharge, focusing on an initial jet angle of 60° because of the relatively high dilution rates achieved for this angle. Roberts and Toms [7] and Roberts et al [9] also focused on the 60° discharge configuration, where both the trajectory and dilution rate were measured. A jet discharge into a moving ambient was also investigated [12].…”

Section: Background and Previous Studiesmentioning

confidence: 99%

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An Experimental Investigation on Inclined Negatively Buoyant Jets

Bashitialshaaer

Larson

Persson

2012

Water

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An experimental study was performed to investigate the behavior of inclined negatively buoyant jets. Such jets arise when brine is discharged from desalination plants. A turbulent jet with a specific salinity was discharged through a circular nozzle at an angle to the horizontal into a tank with fresh water and the spatial evolution of the jet was recorded. Four different initial jet parameters were changed, namely the nozzle diameter, the initial jet inclination, the jet density and the flow rate. Five geometric quantities describing the jet trajectory that are useful in the design of brine discharge systems were determined. Dimensional analysis demonstrated that the geometric jet quantities studied, if normalized with the jet exit diameter, could be related to the densimetric Froude number. Analysis of the collected data showed that this was the case for a Froude number less than 100, whereas for larger values of the Froude number the scatter in the data increased significantly. As has been observed in some previous investigations, the slope of the best-fit straight line through the data points was a function of the initial jet angle (θ), where the slope increased with θ for the maximum levels (Y m ) studied, but had a more complex behavior for horizontal distances.

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Section: Background and Previous Studiesmentioning

confidence: 99%

Section: Background and Previous Studiesmentioning

confidence: 99%

An Experimental Investigation on Inclined Negatively Buoyant Jets

Bashitialshaaer

Larson

Persson

2012

Water

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“…The value of the length scales depends, anyhow, on the role of the forces acting on the effluent and varies along the trajectory of the effluent. The main length scales for a round buoyant jet are (Roberts et al, 1997): 123 ,. CCC : experimental constants or coefficients obtained from laboratory physical scale models (for a stagnant environment, different discharge angles, etc.).…”

Section: A) Models Based On a Dimensional Analysis Of The Phenomenonmentioning

confidence: 99%

“…A significant quantity of laboratory tests were carried out obtaining experimental coefficients for dimensional analysis formulas. Roberts et al, 1997, developed new experiments using optical Laser Fluorescence induced (LIF) techniques for a more rigorous study of a 60º hyperdense jet, discharged on a stagnant environment. Cipollina et al, 2005, developed a numerical model for hyperdense jets discharged into a stagnant environment, based on the integration of differential equations.…”

Section: Research Related To Brine Discharge Behaviour and Modelling:mentioning

confidence: 99%

Impacts of Brine Discharge on the Marine Environment. Modelling as a Predictive Tool

Palomar¹,

Losada²

2011

Desalination, Trends and Technologies

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“…In contrast Lane-Serff et al (1993) [8] for angles between 0° and 75°, found that the maximum height increases with the angle. Roberts et al (1997) [20] studied jets with an angle of 60° focusing on the impact point and the bottom layer dilution. Bloomfield and Kerr (2002) [21] focused on the maximum edge heights for jets with inclination between 30° and 90°.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies for the characterization of the mixing processes in negative buoyant jets

Besalduch

Badas

Ferrari

et al. 2013

EPJ Web of Conferences

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Abstract.A negatively buoyant jet (NBJ) corresponds to the physical phenomenon that develops when a fluid is discharged upwards into a lighter environment or downwards into a heavier receptor fluid. In a NBJ the flow is initially driven mostly by the momentum, so it basically behaves as a simple jet released with the same angle, while far from the outlet the buoyancy prevails, bending the jet axis down and making it similar to a plume. The coexistence in the same phenomenon of both the characteristics of simple jets and plumes makes the NBJs a phenomenon still not entirely explained but, considering also the numerous practical applications, very interesting to study. Here some of the experimental results are presented. The laboratory experiment were obtained on a model simulating a typical sea discharge of brine from desalination plants: a pipe laid down on the sea bottom, with orifices on its lateral wall, releasing brine (heavier than the sea water) with a certain angle to the horizontal, in order to increase the jet path before sinking to the seafloor. A non-intrusive image analysis technique, namely Feature Tracking Velocimetry, is applied to measure velocity fields, with the aim at understanding the influence of some non-dimensional parameters driving the phenomenon (e.g. Reynolds number, release angle) on the structure of the NBJ and of the turbulence.

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Mixing in Inclined Dense Jets

Cited by 167 publications

References 13 publications

An Experimental Investigation on Inclined Negatively Buoyant Jets

An Experimental Investigation on Inclined Negatively Buoyant Jets

Impacts of Brine Discharge on the Marine Environment. Modelling as a Predictive Tool

Experimental Studies for the characterization of the mixing processes in negative buoyant jets

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