Usually, ocean outfalls dispose of wastewater by means of jets discharged by multiport diffusers. Although depending on the process of pre-treatment, the effluent contains particles that may settle in the vicinity of the diffuser, originating banks of sediments with undesirable environmental impacts.

This paper reports a study with theoretical and experimental components, on the sedimentation of particles from vertical round jets. It might be considered fundamental research, because it is expected to contribute for a better understanding of two-phase flows, but many practical applications can be referred, for instance, design of ocean outfalls, industrial chimneys, studies of sedimentation in lakes, volcanoes, etc.

The study provides practical criteria to predict the distance that particles will travel before settling, as well as their concentration on the ground.