Velocity measurements in inclined negatively buoyant jets

Crowe, A. T.; Davidson, M. J.; Nokes, Roger

doi:10.1007/s10652-015-9435-y

Cited by 28 publications

(26 citation statements)

References 28 publications

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“…However, the impact point's location depends on nozzle elevation and bed slope, so it is site-specific. Therefore, various past studies (Shao and Law 2010;Christodoulou et al 2015;Crowe et al 2016;Papakonstantis and Tsatsara 2018) have investigated the return pointwhich is independent of nozzle height and bed sloperather than the impact point for more generality. The return point is the location where the flow returns to the nozzle elevation.…”

Section: Horizontal Distance Of Return Pointmentioning

confidence: 99%

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Effect of Proximity to Bed on 30° and 45° Inclined Dense Jets: a Numerical Study

2021

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Employing inclined dense jets is a common way for the disposal of brine effluent from coastal desalination plants. This paper numerically analyzes the mixing and geometrical properties of 30° and 45° inclined dense jets when they discharge close to the bed. For this purpose, two series of numerical simulations were developed. First, the nozzle acts as a free jet when it is placed far enough from the lower boundary. Meanwhile, in the second series, the distance between the nozzle tip and seabed is substantially reduced. Consequently, by comparing these two series, the effect of proximity to bed on the behavior of dense jets is investigated. The governing equations are solved by modifying a solver within the CFD package of OpenFOAM. The numerical results are presented in comparative figures and compared to the previous works. Comparisons indicated that the numerical model predicts the geometrical characteristics of dense jets in good agreement with the past experimental studies. However, the dilution predictions are conservative. It has been observed that proximity to the bed has almost no appreciable effects on the behavior of 45° jets. However, for 30° jets, when the bed proximity parameter ( 0 ⁄ ) falls below 0.14, normalized values of horizontal and vertical locations of centerline peak and return point dilution are slightly reduced while the terminal rise height remains untouched. Keywords Dense jet . Negatively buoyant jet . Mixing . Coanda effect . CFD . OpenFOAM Article Highlights The mixing and geometrical properties of 30° and 45° inclined dense jets were numerically analyzed.  Some characteristics of 30° jets were influenced by the lower boundary.  The behavior of 45° inclined dense jets was almost insensitive to variations of the bed proximity parameter.  The RANS approach was able to predict geometrical characteristics while dilution predictions were conservative.

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Section: Horizontal Distance Of Return Pointmentioning

confidence: 99%

“…12 (b). The experimental results of Crowe et al (2016) are also added for comparison. As can be seen from the figure, the inner and outer widths are almost identical near the source (from nozzle tip until about terminal rise height).…”

Section: Cross-sectional Concentration Profiles and Jet Spreadmentioning

confidence: 99%

Effect of Proximity to Bed on 30° and 45° Inclined Dense Jets: a Numerical Study

2021

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“…LIF experiments for dense jets inclined at angles between 15 • and 85 • were also carried out by Abessi and Roberts [16]. Crowe et al [17] reported experimental results for the velocity field and the geometric characteristics of jets inclined at angles between 15 • and 75 • . Flow visualization experiments were conducted by Papakonstantis and Tsatsara [18] for dense jets inclined at angles between 15 • and 70 • and results were presented for geometric characteristics of the upper jet boundary.…”

Section: Introductionmentioning

confidence: 99%

On the Computational Modeling of Inclined Brine Discharges

Papakonstantis

Papanicolaou

2022

Fluids

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In this paper, five computational approaches are used to model bulk flow parameters of inclined round negatively buoyant jets. More specifically, an integral model employing Gaussian distributions for velocity and apparent acceleration of gravity, proposed in earlier study, is implemented with two different entrainment formulae. The remaining three computational approaches include an integral model known as EMA, which takes into consideration the fluid detachment occurring in the inner side of the flow near the terminal height, the widely known commercial model Corjet and analytical solutions that were proposed in a previous study. Predictions are provided for the maximum centerline height and its horizontal position, the terminal height of the upper jet boundary, the horizontal distance to the points where the jet centerline and the upper jet boundary return to the source level, the centerline dilution at the maximum height and the centerline dilution at the return point. Detailed comparisons are made in dimensionless form between the estimations provided by the models and a wide range of experimental data for discharge angles between 15° and 90°. Conclusions are drawn regarding the performance of the five computational approaches.

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“…Papakonstantis et al (2011-a [9] and 2011-b [10]) experimentally studied the geometrical characteristics (via image analysis techniques) and the concentration (via probes) of inclined NBJs. In other experiments, velocity measurements were performed (e.g., Crowe et al, 2012 [11] and 2016 [12],…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Regular Waves on Inclined Negatively Buoyant Jets

Ferrari

Badas

Querzoli

2018

Water

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Abstract:The target of this paper is to measure the modifications that regular waves induce on the geometrical features and dilution of inclined negatively buoyant jets. In order to achieve this aim, we have carried out a set of experiments in a wavemaker-equipped flume, by measuring the concentration fields via light-induced fluorescence, a non-intrusive and full-field image analysis technique. The wave and jet parameters were selected in order to simulate the case of a typical discharge of brine, from a desalination plant, into the Mediterranean Sea, and compare it to a reference case, i.e., the same jet discharging into a stagnant water body. The mean concentration fields were obtained, as well as the geometrical features and dilution of the jets. The three main effects of waves on inclined negatively buoyant jets are the bifurcation (i.e., the separation in two branches), the rotation of the point of maximum height and the oscillation of the impact point around a fixed position different from the stationary one, and the reduction in size of the sea region interested by the discharge; this last effect increases with the wave period. As a consequence, under waves with high period and amplitude, the dilution of inclined negatively buoyant jets tends to decrease.

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Velocity measurements in inclined negatively buoyant jets

Cited by 28 publications

References 28 publications

Effect of Proximity to Bed on 30° and 45° Inclined Dense Jets: a Numerical Study

Effect of Proximity to Bed on 30° and 45° Inclined Dense Jets: a Numerical Study

On the Computational Modeling of Inclined Brine Discharges

On the Effect of Regular Waves on Inclined Negatively Buoyant Jets

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