Behavior of Dense Discharges beyond the Return Point

Abstract

Trajectory and centerline mean dilution data obtained from negatively buoyant jets, using a laser-induced fluorescence system, are presented at locations beyond the point at which the discharged fluid returns to its release height. Although this return point has been a focus of recent studies, site specific variations in source height and boundary angle can result in the flow impacting the boundary at locations that are distinct from this reference point. The new data are presented for source inclinations of 30, 45, and 60° above the horizontal. Previously developed semianalytical solutions are extended to include the aforementioned site-specific geometric parameters. The ability of these extended solutions and those of the CorJet model to predict the location and mean centerline dilution at various impact points are assessed for nominal boundary angles that range from 0–20° below the horizontal for trajectory and 0–15° for dilution. Comparisons with the experimental data indicate that the extended semianalytical solutions provide superior predictions under the prescribed conditions.