EXPERIMENTAL STUDY OF FLOW THROUGH TRAPEZOIDAL WEIR CONTROLLED UNDER A SEMI-CIRCULAR GATE
Abstract
Different parameters of a weir model have a great effect on the discharge coefficient. In this experimental study the effect of varying angle of a trapezoidal weir coupled with a below semi-circular gate is determined. The result showed that the higher the value of the higher the coefficient of discharge. The respective average discharge coefficient of the block model and the trapezoidal weir models are; 0.48031,0.48880, 0.49565, 0.49647, 0.49892 and 0.49934. As such the trapezoidal weir with has the highest value of average discharge coefficient =0.49934. Hence the most efficient. Linear and nonlinear regression analysis were used to generate mathematical equations that can be used to predict the flow rate Q for the combined weir-gate structure and the discharge coefficient of the most efficient model with respectively. The discharge coefficient for the most efficient weir model was found to be 3.81% more than that of the block model (with rectangular weir). The predicted coefficient of discharge for the most efficient model was also found to be in good agreement with the observed discharge coefficient with a percentage error in the range of 0.4%
References
Ferro, V. (2000), “Simultaneous flow over and under gateâ€, Journal of Irrigation and Drainage Engineering, Vol. 126, No.3, pp.190-193.
Hayawi, H. A. M, Amal Abd Al-Ghani Yahia, Hayawi, G. A. M. (2008), “Free Combined Flow Over a Triangular Weir and Under Rectangular Gateâ€, Damascus University Journal Vol.24, No.1. pp.9
Isma’il, M.H., (2012), “Experimental Investigation for Flow Through Combined Structure Weir Gateâ€, Thesis submitted to college of Engineering, Kufa University.
Khassaf S.I and Habeeb M., (2014) “Experimental Investigation for flow through combined trapezoidal weir and rectangular gateâ€, International Journal of Science and Engineering Research, Vol.5, Issue4, April-2014.
Khassaf S.I, Yost S. A. Yost and Abbas H.A (2013) “Experimental Study of Coupled Parabolic
Kumar S, Ahmad Z, Mansoor T., (2011), “A new approach to improve the discharging capacity of sharp-crested triangular plan form weirsâ€. Flow measurement and instrumentation, 22(2011): 175-180
Mohammad Z and Iqbal K (2020) “estimation of discharge coefficient of a side weir†Journal of water and energy international March 2020 Water and Energy International 62 (11):71-74
Muhammad, M. M (2012), “Experimental study of flow characteristics over compound crested weir†M.sc Thesis, Department of Water Resources and Environmental Engineering, Ahmadu Bello University, Zaria.
Munta, S.K (2010), “Evaluation study of energy dissipation over stepped spillway models†M.Sc. thesis, Department of Water Resources and Environmental Engineering, Ahmadu Bello University Zaria.
Nouri M and Hemmati M (2020) “Flow Measurement and Instrumentation†Elsevier Volume 75, October 2020,101780
Piratheepan, M., Winston, N.E.F., Pathirana, K.P.P., (2006), “Discharge Measurement in Open Channels Using Compound Sharp Crested Weirsâ€, Journal of the Institution of Engineers, Sri Lanka, Engineer Vol. XXXX, No.03, pp.31-38
Rafi, M.Q., Ihsan, A.A., Muna, A.H., Qusay, A.M., (2018), “Experimental Study of Coupled Parabolic Weir over Flow and Gate under Flow Rateâ€, Journal of Information Engineering and Applications, Vol.8, No.4, 2018. ISSN 2224-5782 (print) ISSN 2225-0506 (online)
Saad N.Y and Fattouh E.M (2017) “Hydraulic characteristics of flow over weirs with circular Openings†Ain Shams Engineering Journal. Volume 8, Issue 4, December 2017,Pages 515-522
Weir over Flow and Gate under Flow Rate†â€, International Journal of Science and Engineering Research, Vol.4, Issue4, April-2013
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