Author(s): M. K. Voustrou; P. C. Yannopoulos; G. C. Christodoulou

Linked Author(s): Panayotis Yannopoulos, George Christodoulou

Keywords: Desalination brine disposal; Negatively buoyant jets; Dense jets; Plane jets; Marine outfalls

Abstract: Dense effluents, such as desalination brines, are commonly discharged inclined upwards and form negatively buoyant jets (NBJ) .In this paper, we report experiments on plane NBJ performed in a laboratory tank. The jets were di scharged from a slot 20 cm long and 2 mm wide, placed at angles to the horizontalθ0=0o and 45o. The densimetric Froude number was in the range F0=15~38 and the Reynolds Re0=1200~3200. The trajectory was measured by analysis of video recordings, whereas axial concentrations were determined by extracting small volumes of liquid, using a thin needle adapted on a flexible pipe of small diameter. The results are presented in dimensionless form and compared with existing data in the literature forθ0=0º, whereas forθ0=45ºuseful observations are made for the normalized terminal height of rise and the normalized distance to the return point compared to round NBJ. For both discharge angles, the results are found to agree reasonably well with model predictions.

DOI:

Year: 2015