Hydraulic Characteristics of a Drop Square Manhole with a Downstream Control Gate
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 138, Issue 6
Abstract
Manhole drops in drainage systems are often designed for providing energy dissipation, for controlling high velocities and for minimizing sewers structural damage. The flow is characterized by excessive air-entrainment and high turbulence. The manhole geometry, the upstream and downstream flow characteristics and possible transitions between the manhole and the sewers control the flow inside the manhole. This experimental research aims to investigate the effects of a free jet in a square drop manhole with a downstream control gate by analyzing the flow conditions, discharge coefficients, turbulence downstream, and energy dissipation for three different flow regimes, R1, R2, and R3. This research propose to (1) adjust the limits of the existing regimes classification by including a new impact number based on downstream gate opening, and (2) obtain empirical equations for predicting the discharge coefficients with the flow regime. Non dimensional discharges were better predicted for R1 by using critical velocity. The energy dissipation and turbulence was found to respectively decrease and increase by raising the water discharge from the inlet and by opening the gate.
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Acknowledgments
The authors acknowledge the contribution of Ricardo Martins and Mr. Joaquim Cordeiro in the experimental work done in the laboratory. The research presented was funded by the Portuguese Foundation for Science and Technology (FCT) through project PTDC/AAC-AMB/101197/2008.
References
Bagheri, S., Afzalimehr, H., and Sui, J. (2010). “Briefing: Discharge coefficient for sluice gates.” Water Manage.CSWDAV, 163(9), 435–438.
Carvalho, R. F., and Leandro, J. (2010). “Physical investigation of the flow in a squared manhole drop and downstream.” 1st European IAHR Congress (CD-ROM), The International Association for Hydro-Environment Engineering and Research, Edinburgh, UK.
Chanson, H. (2004). “Hydraulics of rectangular dropshafts.” J. Irrig. Drain. Eng.JIDEDH, 130(6), 523–529.
Christodoulou, G. C. (1991). “Drop manholes in supercritical pipelines.” J. Irrig. Drain. Eng.JIDEDH, 117(1), 37–47.
de Marinis, G., Gargano, R., Granata, F., and Hager, W. H. (2007). “Circular drop manholes: Preliminary experimental results.” 32nd IAHR Congress (CD-ROM), The International Association for Hydro-Environment Engineering and Research, Venice, Italy.
Goring, D. G., and Nikora, V. I. (2002). “Despiking ADV data.” J. Hydraul. Eng.JHEND8, 128(1),117–126.
Granata, F. G., deMarinis, Gargano R., and Hager, W. H. (2009). “Energy loss in circular drop manholes.” 33rd IAHR Congress (CD-ROM), The International Association for Hydro-Environment Engineering and Research, Vancouver, Canada.
Granata, F., Marinis, G., de Gargano, R., and Hager, W. H. (2011). “Hydraulics of circular drop manholes.” J. Irrig. Drain. Eng.JIDEDH, 137(2), 102–111.
Mori, N., Suzuki, T. T., and Kakuno, S. (2007). “Noise of acoustic doppler velocimeter data in bubbly flow.” J. Eng. Mech.JENMDT, 133(1), 122–125.
Rajaratnam, N., Mainali, A., and Hsung, C. Y. (1997). “Observations on flow in vertical dropshafts in urban drainage systems.” J. Environ. Eng.JOEEDU, 123(5), 486–491.
Roth, A., and Hager, W. H. (1999). “Underflow of standard sluice gate.” Exp. in fluids57CBAP, 27(4), 339–350.
Santos, F. A., Carvalho, R. F., and Sancho, F. P. (2008). “Performance of a multipurpose hydraulic channel.” 2nd Int. Junior Researcher and Engineer Workshop on Hydraulic Structures, IAHR, Edizioni Plus, Pisa University Press, Pisa, Italy.
Swamee, P. K. (1992). “Sluice gate discharge equations.” J. Irrig. Drain. Eng.JIDEDH, 118(1), 56–60.
Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 138 • Issue 6 • June 2012
Pages: 569 - 576
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Apr 28, 2011
Accepted: Nov 20, 2011
Published online: Nov 22, 2011
Published in print: Jun 1, 2012
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