Hydraulic characteristics of turbulent circular jets under surface confinement

Abstract

Experimental study is carried out to investigate the hydraulics of turbulent circular jet under surface confinement. The effect of surface confinement on the jet centerline velocity and axial velocity profiles under different surface confinements and jet exit velocities has been studied. The decay of jet centerline velocity is high under surface confinement compared to the free jet. The effect of surface confinement on the velocity profile in the vertical axis is negligible near the jet exit; however, it increases downstream of the jet exit. Flux entrainment increases linearly along the jet axis and decreases as surface confinement increases, while the kinetic energy decreases linearly along the jet axis and increases as surface confinement increases.

Keywords:

• circular jet
• fluid
• flux
• kinetic energy
• surface confinement
• turbulent jet

Acknowledgment

This article is one of the papers presented at the Hydro-2012 conference held at IIT Bombay on December 7–8, 2012 that were shortlisted by the editor for publication in this journal after re-review and revisions wherever necessary.