Experimental study of a vertical jet in a vegetated crossflow

Meftah, Mouldi Ben; Serio, Francesca De; Malcangio, Daniela; Mossa, Michele; Petrillo, Antonio

doi:10.1016/j.jenvman.2015.08.035

Cited by 29 publications

(30 citation statements)

References 38 publications

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“…In the ascending region (x/D < 12 and 15, respectively for R1 and R2), the U/Ua-profiles show two characteristic maxima: an absolute maximum, located within the jet flow-field slightly above the jet axis, and a local maximum, appeared in the jet wake-like region. This finding is in good agreement with results obtained by Ben Meftah et al [14] and Sherif and Pletcher [39] for momentum jets in crossflow. This suggests that, in the ascending region, the jet is primarily driven by momentum flux, behaving like a vertical non-buoyant jet in crossflow [5,14,39].…”

Section: Jet Velocity Fieldssupporting

confidence: 93%

“…This finding is in good agreement with results obtained by Ben Meftah et al [14] and Sherif and Pletcher [39] for momentum jets in crossflow. This suggests that, in the ascending region, the jet is primarily driven by momentum flux, behaving like a vertical non-buoyant jet in crossflow [5,14,39]. The velocity profiles in Figures 4a and 5a show that the absolute maximum of U/U a , in the jet flow-field, always appears slightly above the jet axis.…”

Section: Jet Velocity Fieldssupporting

confidence: 93%

“…These results are in complete agreement with those obtained by Ben Meftah et al [14] and Sherif and Pletcher [39], reflecting simply the vertical distribution of U/U a in the ambient current without the jet effects. In the descending region, the two velocity-maxima are less pronounced, and the U/U a -profiles, at This finding is in good agreement with results obtained by Ben Meftah et al [14] and Sherif and Pletcher [39] for momentum jets in crossflow. This suggests that, in the ascending region, the jet is primarily driven by momentum flux, behaving like a vertical non-buoyant jet in crossflow [5,14,39].…”

Section: Jet Velocity Fieldssupporting

confidence: 92%

“…Since all components of aquatic ecosystems are very sensitive to any water quality changes, a rapid and maximum dilution of the jet discharge within the ambient flow is a key solution to keep the ecosystem healthy and sustainable. Mixing of turbulent jets within surrounding environment was the topic of numerous experimental, analytical and numerical studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…This significantly reduces the negative-buoyancy effect of the jet, leading to the disappearance of the descending region. At urF > 2, the dense jet almost behaves as a momentum jet discharged into a crossflow [5,14,20,21].…”

Section: Introductionmentioning

confidence: 99%

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Turbulence Measurement of Vertical Dense Jets in Crossflow

Meftah

Mossa

2018

Water

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Turbulence measurement of a dense jet perpendicularly issued into a crossflow is investigated experimentally. The flow-velocity components were extensively measured with a high frequency Acoustic Doppler Velocimeter (ADV) system, whereas, a Micro Scale Conductivity Temperature instrument was used to measure the jet salinity. Special attention is given to understand the jet flow-structures in the flow symmetry plane. The flow velocity-fields, the jet trajectory, the turbulence intensities, the turbulent kinetic energy, the turbulent length scales, and the dispersion coefficients have been analyzed. The flow velocity-fields show that the dense jet is characterized by two distinct regions: an ascending region, of jet-like mixing, and a descending region of plume-like mixing. In this study, a new scaling approach of the jet trajectories, based on the jet characteristic length scales, is proposed, leading to an empirical closed-form expression to predict the jet trajectory. The turbulence analysis shows that the jet is accompanied by high levels of flow-turbulence intensities and large kinetic energy production. The results of the turbulent length scales indicate that the ambient flow-field, without jet effect, is an isotropic process. However, in the jet flow-field, a significant spatial-variation of the turbulent length scales was observed, indicating an anisotropic process. The trends of the dispersion coefficients follow those of the turbulent length scales. In comparison with the ambient flow, the jet flow-field shows a decrease of the longitudinal dispersion coefficient and an increase of the vertical one, leading to the increase of the jet width.

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Section: Jet Velocity Fieldssupporting

confidence: 93%

Section: Jet Velocity Fieldssupporting

confidence: 93%

Section: Jet Velocity Fieldssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Turbulence Measurement of Vertical Dense Jets in Crossflow

Meftah

Mossa

2018

Water

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Turbulent jet through porous obstructions under Coriolis effect: an experimental investigation

et al. 2021

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The present study has the main purpose to experimentally investigate a turbulent momentum jet issued in a basin affected by rotation and in presence of porous obstructions. The experiments were carried out at the Coriolis Platform at LEGI Grenoble (FR). A large and unique set of velocity data was obtained by means of a Particle Image Velocimetry measurement technique while varying the rotation rate of the tank and the density of the canopy. The main differences in jet behavior in various flow configurations were assessed in terms of mean flow, turbulent kinetic energy and jet spreading. The jet trajectory was also detected. The results prove that obstructions with increasing density and increased rotation rates induce a more rapid abatement of both jet velocity and turbulent kinetic energy. The jet trajectories can be scaled by a characteristic length, which is found to be a function of the jet initial momentum, the rotation rate, and the drag exerted by the obstacles. An empirical expression for the latter is also proposed and validated. Graphic abstract

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