This paper present the effect of the lower gate lip on the coefficient of contraction, velocity and discharge which have been made in a rectangular flume with four gates opening from (2 to 4.5) cm, five different discharges from (6.2 to 18.15)l/s and five different gate cases (vertical and inclined vertically) by angle (45)° with and opposite flow direction with horizontal and sharp lower lip.The values of coefficients of contraction (Cc) and discharge (Cd) increases when gate slope increases with flow direction and the lower lip is horizontal, these increases are (16)% and (18)%respecttively, while these values decreases when gate slope increases opposite flow direction and the lower lip is horizontal these decreases are (13)% and (11)% respectively.The values of coefficient of velocity (Cv) remain constant and don’t effect with changes of gate slope or gate lip.
References
[1]
N. Rajaratnam and K. Subramanya, “Flow Equation for the Sluice Gate,” Journal of Irrigation and Drainage Engineering, Vol. 93, No. 9, 1967, pp. 167-186.
[2]
D. D. Fangmeier and T. S. Strelkoff, “Solution for Gravity Flow under a Sluice Gate,” Journal of the Engineering Mechanics Division, Vol. 94, No. 2, 1967, pp. 153-176.
[3]
L. T. Isaacs, “Numerical Solution for Flow under Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 103, No. 5, pp. 1977, pp. 473-481.
[4]
N. Rajaratnam, “Free Flow Immediately Below Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 103, No. 4, 1977, pp. 345-351.
[5]
A. H. D. Cheng, J. A. Liggett and P. L.-F. Liu, “Boundary Calculations of Sluice and Spillway Flows,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 107, No. 10, pp. 1163-1178.
[6]
J. H. Masliyah, k. Nandakuma, F. Hemphill and L. Fung, “Body-Fitted Coordinates for Flow under Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 111, No. 6, 1985, pp. 922-933.
[7]
J. S. Montes, “Irrotational Flow and Real Fluid Effects under Planar Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 123, No. 3, 1997, pp. 219-232.
[8]
W. H. Hager, “Underflow of Standard Sluice Gate, “Experiments in Fluids,” Experiments in Fluids, Vol. 27, No. 4, 1999, pp. 339-350.doi:10.1007/s003480050358
[9]
H. Nago, “Influence of Gate Shapes on Discharge Coefficients,” Proceedings of Japan Society of Civil Engineers, 1978, pp. 59-71.
[10]
G. K. Noutsopoulos and S. Fanariotis, “Discussion of Free Flow Immediately below Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 104, No. 3, 1978, pp. 451-455.
[11]
P. L. Betts, “Discussion of Numerical Solution for Flow under Sluice Gates,” Journal of American Society of Civil Engineers. Hydraulics Division, Vol. 104, No. 2, 1978, pp. 313-315.
