Dilution of Multiple Nonbuoyant Circular Jets in Crossflows

Moawad, Ahmed K.; Rajaratnam, N.

doi:10.1061/(asce)0733-9372(1998)124:1(51)

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…A detailed review of the different analytical models for computing the characteristics and the position of a jet in crossflow is given by Rajaratnam (1976). Moawad and Rajaratnam (1998) considered several jets in crossflow, where the effects of spacing and the number of ports were investigated. The results indicate that dilution in the mixing region is generally reduced due to the presence of neighbouring jets if multiple jets are used.…”

Section: Modelling Of Turbidity Currents and Jet Injectormentioning

confidence: 99%

Effect of inclined jet screen on turbidity current

Oehy

Cesare

Schleiss

2010

Journal of Hydraulic Research

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The sustainable use of reservoirs for irrigation, flood protection, water supply and hydropower may be endangered due to unavoidable reservoir sedimentation. Turbidity currents are the main process for the transport and deposit of sediments in reservoirs, especially in the deepest part near the dam where vital structures such as power intakes and bottom outlets are located. Besides other measures such as solid or permeable obstacles, turbidity currents can be influenced by means of an inclined water jet screen. Physical experiments of a turbidity current flowing through a water jet screen were carried out. Velocity profiles, front velocities, and deposit evolutions were determined. The results indicate that in certain configurations, turbidity currents can be partially stopped by the jet screen. Furthermore, the deposits downstream of the screen may be reduced up to a factor of two as compared with deposits of a free-flowing turbidity current.

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Section: Modelling Of Turbidity Currents and Jet Injectormentioning

confidence: 99%

Effect of inclined jet screen on turbidity current

Oehy

Cesare

Schleiss

2010

Journal of Hydraulic Research

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“…Although some studies have been carried out on parallel-oriented double jets in cross ow to enhance the effectiveness of dilution zone mixing in a gas turbine combustion chamber and to comprehend the characteristics of e uent discharging into riverbeds (Holderman and Walker 1977; Savory and Toy 1999; Moawad and Rajaratnam 1998;Choi et al 2016), only a few studies on jets in a line perpendicular to the cross ow have been published (Lai and Lee 2010; Yu et al 2006). Kamotani and Greber (1974) reported that when two closely spaced jets are arranged parallel to the cross ow, the rear jet is in the wake of the front one, where the cross ow velocity is very small.…”

Section: Introductionmentioning

confidence: 99%

Velocity Field of Submerged Multiple Non-buoyant Jet Groups in Crossflow

Ali

2023

Environ. Process.

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This paper presents the results of a laboratory study on the three-dimensional velocity eld of circular non-buoyant multiple jets discharged into a perpendicular cross ow. Two to four momentum jets were taken in a group with spacings ve times the jet diameters and the three-dimensional velocity eld was measured using an Acoustic Doppler Velocimetry (ADV) system to investigate the interaction of jets with cross ow. The rear jets were found to be less de ected than the front one due to the reduction of effective cross ow velocity because of the sheltering effect as well as the entrainment demand. For a jet spacing of 5 times of jet diameter, the effective cross ow to upstream approach velocity ratios were found to vary between 0.4 and 0.6 regardless of the momentum length scale and the number of jets in a group. The rates of velocity reduction in between jets observed in this study, were favorably compared with previous results, where velocity was inferred from Laser Induced Fluorescence (LIF) measurements. The ndings of this study can be used to predict the jet trajectories and dilutions of multiple jets in cross ow as well as modeling of discharges from multiport diffusers. This work will be helpful for the engineers and other scientists dealing with the disposal of wastewater, thermal e uents, or air pollutants into owing environments. HighlightsVelocity eld of multiple jet groups in cross ow were measured using an ADV system Two to four momentum jets at spacings of 5D were discharged in cross ow The rear jets were found less de ected than the front one due to the sheltering effect The cross ow velocity was found to reduce to about half after passing the rst jet Velocity reductions in between jets were favorably compared with previous results

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Study on the flow field and concentration characteristics of the multiple tandem jets in crossflow

Huai

Zhou

2012

Sci. China Technol. Sci.

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Dilution of Multiple Nonbuoyant Circular Jets in Crossflows

Cited by 11 publications

References 9 publications

Effect of inclined jet screen on turbidity current

Effect of inclined jet screen on turbidity current

Velocity Field of Submerged Multiple Non-buoyant Jet Groups in Crossflow

Study on the flow field and concentration characteristics of the multiple tandem jets in crossflow

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