Prediction of turbulent, axisymmetric, dense jets discharged to quiescent ambients

Madni, I.K.; Ahmad, Shakeel

doi:10.1016/0895-7177(89)90113-1

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…This height of terminal rise, defined as z t , is a crucial parameter in brine discharge design in order that the effluent brine plume can be kept below the free water surface. Notably, however, a diverse terminology has been used in the literature for this parameter (e.g., maximum height of the top boundary in [10], terminal rise height in [11,12], maximum rise height in [23], final fountain height in [24], maximum rise level in [14,16], maximum height of the outer edge in [15]). Hereinafter, "terminal rise height" is adopted in the present study when referring to this term.…”

Section: Terminal Rise Heightmentioning

confidence: 99%

Mixing and boundary interactions of 30° and 45° inclined dense jets

2010

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60 • inclined dense jets had been recommended for brine discharges from desalination plants to achieve a maximum mixing efficiency. However, the terminal rise associated with 60 • is relatively high and thus the angle may be too large for disposal in shallow coastal wasters. In this study, we investigate the mixing behavior of dense jets discharging at smaller angles of 30 • and 45 • in a stationary ambient. Combined Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) were used as the measurement approaches that captured the velocity and concentration fields, respectively. Based on the experimental results, the characteristic geometrical features of the inclined dense jets, including the location of the centerline peak and the return point where the dense jet returns to the source level, etc., are quantified. The mixing and diluting behaviors are also revealed through the analysis of the axial and cross-sectional velocity and concentration profiles. In addition to the free inclined discharges, the present study also examines the effect of the proximity to the bed. Through the comparison of the results between two experimental series with distinct z 0 /D but overlapping z 0 /L M , the latter is identified as the deciding factor for the boundary influence.

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