Hydraulic Jump as “Mixing layer”
Publication: Journal of Hydraulic Engineering
Volume 115, Issue 12
Abstract
In free‐surface water flows the hydraulic jump has usually been considered a turbulent reverse roller supported by an underlying and expanding stream. The air‐entrainment aspect of the water surface at the jump is normally a predominant feature. In this investigation the character of the turbulence in the jump, and therefore of the air‐entrainment mechanism, is controlled by the use of drag‐reducing soluble additives. The resulting lower level of entrained air permits photographic and visual observation of a jump in a small glass‐sided laboratory flume. The photographs presented in the paper show that the remaining air bubbles act as flow tracers and reveal a turbulent structure in the upper part of the jump very similar in appearance to that observed for a turbulent mixing layer in a wind tunnel using shadow refractography. Measurements of expansion angles for the turbulence structures in the jump agree well with wind‐tunnel measurements of expansion angles for the turbulent mixing layer between coflowing airstreams with a velocity difference.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bakhmeteff, B. A., and Matzke, A. E. (1936). “The hydraulic jump in terms of dynamic similarity.” Trans., ASCE, 101, Paper No. 1935, 630–680.
2.
Bidone, Giorgio (1820). “Experiences sur le remous et la propagation des ondes.” Memoria della Reale Accademia delle Scienze di Torino, Italy, (in French), 25, 21–112.
3.
Brown, G., and Roshko, A. (1971). “The effect of density difference on the turbulent mixing layer.” Proc., AGARD Specialist Meeting on Turbulent Shear Flows, Advisory Group for Aeronautical Research and Development, London, England.
4.
Brown, G. L., and Roshko, A. (1974). “On density effects and large structure in turbulent mixing layers.” J. Fluid Mech., Vol. 64, 775–816.
5.
Chow, V. T. (1959). Open channel hydraulics. McGraw‐Hill Book Co., New York, N.Y.
6.
Demotakis, P. E. (1986). “Two‐dimensional shear‐layer entrainment.” AIAA Journal, Vol. 24, 1791.
7.
Hoyt, J. W., and Taylor, J. J. (1977). “Turbulence structure in a water jet discharging in air.” Physics of Fluids, Vol. 20, S253–S257.
8.
Kourta, A., et al. (1987). “Numerical analysis of a natural and excited two‐dimensional mixing layer,” AIAA Journal, Vol. 25, 279.
9.
McCorquodale, J. A., and Khalifa, A. (1983). “Internal flow in hydraulic jumps.” J. of Hydr. Engrg., ASCE, 109(5), 684.
10.
Narayanan, R. (1975). “Wall jet analogy to hydraulic jump.” J. of Hydr. Div., ASCE, 101(3), 347.
11.
Reif, T. H., Metrakos, A. P., and Hoyt, J. W. (1978). “A laser‐Doppler anemometer study of the classical hydraulic jump.” Measurements in Polyphase Flows, D. E. Stock, ed. American Society of Mechanical Engineers, New York, N.Y., 99–106.
12.
Resch, F. J., Leutheusser, H. J., and Alemu, S. (1974). “Bubbly two‐phase flow in hydraulic jump.” J. Hydr. Div., ASCE, 100(1), 137.
13.
Rouse, H., Siao, T. T., and Nagaratnam, S. (1959). “Turbulence characteristics of the hydraulic jump.” Trans., ASCE, 124, Paper No. 3006, 926–966 (incl. discussions).
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 115 • Issue 12 • December 1989
Pages: 1607 - 1614
Copyright
Copyright © 1989 ASCE.
History
Published online: Dec 1, 1989
Published in print: Dec 1989
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.