Physical Interpretation of Jet Dilution Parameters

by James J. Sharp,

Serial Information: Journal of the Sanitary Engineering Division, 1968, Vol. 94, Issue 1, Pg. 55-64

Document Type: Journal Paper


The curves commonly used to predict the dilution of a horizontal jet of fresh water discharged into saline water are studied. Physical reasons are given for the shape of these curves and, in particular, for the occurrence of points of minimum dilution. On leaving a discharge nozzle, the less dense fluid rises to the surface as (1) a forced jet, or, provided a sufficient depth of receiving fluid is available, as (2) a forced jet followed by a buoyant plume. It is shown that the shape of the dilution curves depends on whether the flow condition is (1) or (2) and that minimum dilutions occur at the transition between (1) and (2), i.e., when the less dense fluid just reaches the surface as a forced jet. The explanation is based on physical reasoning and experiments are described which confirm the writer's hypothesis.

Subject Headings: Water discharge | Curvature | Jets (fluid) | Salt water | Dilution | Parameters (statistics) | Fresh water | Fluid flow

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