Experimental Investigations of Free-Surface Aeration in the Developing Flow of Two-Dimensional Water Jets

[+] Author and Article Information
T. Brattberg, H. Chanson, L. Toombes

Department of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia

J. Fluids Eng 120(4), 738-744 (Dec 01, 1998) (7 pages) doi:10.1115/1.2820731 History: Received August 29, 1997; Revised July 06, 1998; Online December 04, 2007


Turbulent water jets discharging into the atmosphere are often characterized by a substantial amount of free-surface aeration. The effects can be detrimental or beneficial. In any case, the knowledge of the air entrainment mechanisms is essential for an optimum design. New experimental data are presented in the developing flow region of two-dimensional water jets discharging into air. The results indicate that the air diffusion takes place rapidly downstream of the nozzle and it is nearly independent of the momentum transfer process. Further, the distribution of air bubble frequency may be related to the air content distribution by a parabolic relationship.

Copyright © 1998 by The American Society of Mechanical Engineers
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