Effects of jet hydraulic properties on geometry of trajectory in circular buoyant jets in the static ambient flow

Abstract

In this study, governing equations of buoyant jets have been presented and drawdown trajectory of jet has been investigated. To achieve goals of this research program an extensive experimental study has been undertaken, a flume with 3.2 m length, 0.7 m width, 0.95 m height is constructed which is connected to a storage tank of dilute water from one side and a large concrete tank of fresh water on the other side in the Hydraulic Laboratory of Shahid Chamran University, Ahwaz, Iran. An extensive set of experiments was conducted, using different diffuser geometry and concentration of jet injection, to study downstream trajectory. Findings show that the length of jet trajectory decreases 10 up to 30% due to change of jet diameter from 5 to 8 mm. However, when the jet diameter increased from 8 to 15 mm, the length of trajectory showed 40% increased more than the observed length for jet diameter equal to 5 mm. Findings from this experimental study, shows that twice increase in concentration, causes positive length of flux buoyancy decrease 5 to 20%. © 2009 Asian Network for Scientific Information.