Dilution of Circular Turbulent Nonbuoyant Surface Jets in Cross-Flows
Publication: Journal of Hydraulic Engineering
Volume 124, Issue 5
Abstract
This paper presents the results of an experimental study on the dilution of circular nonbuoyant turbulent surface jets of diameter d, discharged perpendicularly into relatively deep cross-flows with depth D in the mixing region. The jet velocity was varied from 2.1 to 12.3 times the velocity of the cross-flow. Concentration measurements were carried out as far as x/d= 630, where x is the distance downstream from the nozzle along the cross-flow. Minimum dilutions of about 100 were attained in this mixing region. A general correlation has been developed to predict the minimum dilution in terms of the transformed distance αx/d, where α is the ratio of the jet to cross-flow velocity. The concentration profiles in the vertical and the transverse directions were found to be similar. Expressions were developed to describe the growth of the width and thickness of the deflected jets. The effect of submergence of the jet nozzle on the minimum dilution was also investigated.
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References
1.
Abdel Gawad, S. T., McCorquodale, J. A., and Gerges, H.(1996). “Near field mixing at an outfall.”Can. J. Civ. Engrg., 23(2), 63–75.
2.
Abramovich, G. N. (1963). The theory of turbulent jets. (English Translation), MIT Press, Cambridge, Mass.
3.
Anwar, H. O.(1987). “Flow of surface buoyant jet in crossflow.”J. Hydr. Engrg., 113(7), 892–904.
4.
Hodgson, J. E., and Rajaratnam, N.(1992). “An experimental study of jet dilution in crossflows.”Can. J. Civ. Engrg., 19(5), 733–743.
5.
Jirka, G. H., and Adams, E. E.(1981). “Buoyant surface jets.”J. Hydr. Div., ASCE, 107(11), 1467–1487.
6.
Policastro, A. J., and Tokar, J. V. (1972). “Heated effluent dispersion in large lakes; state of the art of analytical modelling: critique of model formulations.”Rep. No. ES-11, Argonne National Lab.
7.
Rajaratnam, N. (1976). Turbulent jets. Elsevier Science Publishing Co., Inc., The Netherlands.
8.
Rajaratnam, N. (1988). “Turbulent surface jets in stagnant and moving ambients.”Civil engineering practice. P. N. Cheremisinoff, N. P. Cheremisinoff, and S. L. Cheng, eds., Vol. 2, Technomic Publishing Co., Lancaster, Pa., 629–658.
9.
Rajaratnam, N., and Pani, B. S.(1974). “Three dimensional turbulent wall jets.”J. Hydr. Div., ASCE, 100, 69–83.
10.
Rajaratnam, N., and Langat, J. K. (1995). “Mixing of circular turbulent wall jets in crossflows.”J. Hydr. Engrg., ASCE, 121(10), 694– 698.
11.
Wright, S. J. (1977). “Effects of ambient crossflows and density stratification on the characteristic behavior of round turbulent buoyant jets.”Rep. No. KH-R-36, W. M. Keck Laboratory of Hydraulics and Water Resources, California Inst. of Technology, Calif.
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Information
Published In
Journal of Hydraulic Engineering
Volume 124 • Issue 5 • May 1998
Pages: 474 - 483
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 1998
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