Investigation of Flow Upstream of Orifices
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 134, Issue 1
Abstract
A physical model study is conducted to investigate the flow field upstream of orifices. In particular, new experimental data for the upstream flow pattern resulting from multiple orifices, an orifice near a free surface, and a large orifice (where the pressure gradient across the orifice cannot be ignored) are collected and presented. A new potential flow solution for flow behind orifices is developed to include pressure gradient effects as well as to accurately superpose the solution due to multiple orifices and determine a solution close to orifices. The proposed solution compares well with the measured data for multiple orifices and for an orifice near a free surface. For a large orifice, the skew in the velocity profile in the vertical direction due to the pressure gradient is accurately predicted.
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References
Ali, K. H. M., and Sykes, A. (1972). “Free-vortex theory applied to free overfall.” J. Hydr. Div., 98(5), 973–979.
Anayiotos, A. S., Perry, G. J., Myers, J. G., Green, W. G., Fan, P. H., and Nanda, N. C. (1995). “A numerical and experimental investigation of the flow acceleration region proximal to an orifice.” Ultrasound Med. Biol., 21(4), 501–516.
Chanson, H., Aoki, S., and Maruyama, M. (2002). “Unsteady two-dimensional orifice flow: A large-size experimental investigation.” J. Hydraul. Res., 40(1), 63–71.
Chow, W. L., and Han, T. (1979). “Inviscid solution for the problem of free overfall.” J. Appl. Mech., 46, 1–5.
Clarke, N. S. (1965). “On two-dimensional inviscid flow in a waterfall.” J. Fluid Mech., 22(2), 359–369.
Giesler, M. O., and Stauch, M. (1992). “Color Doppler determination of regurgitant flow: From proximal isovelocity surface areas to proximal velocity profiles.” Echocardiogr., 9(1), 51–62.
Hager, W. H. (1982). “Hydraulics of plane free overfall.” J. Hydr. Div., 109(12), 1683–1697.
Hager, W. H. (1985). “Equations for plane, moderately curved open channel flow.” J. Hydraul. Eng., 111(3), 541–546.
Marchi, E. (1993). “On the free overfall.” J. Hydraul. Res., 31(6), 777–790.
Markland, E. (1965). “Calculation of flow at a free overfall by relaxation method.” Proc. Inst. of Civ. Eng. (UK), 31, 71–78.
Mathew, G. D. (1991). “Higher order one-dimensional equations of potential flow in open channel.” Proc. Inst. of Civ. Eng. (UK), 91, 187–201.
Montes, J. S. (1992). “A potential flow solution for the free overfall.” Proc. Inst. Civ. Eng., Waters. Maritime Energ., 96, 259–266.
Montes, J. S. (1994). “Potential flow solution to 2D transition from mild to steep slope.” J. Hydraul. Eng., 120(5), 601–621.
Montes, J. S. (1997). “Irrotational flow and real fluid effects under planar sluice gates.” J. Hydraul. Eng., 123(3), 219–232.
Recusani, R., et al. (1991). “A new method for quantification of regurgitation flow rate using color Doppler flow imaging of the flow convergence region proximal to a discrete orifice: An in vitro study.” Circulation, 83(2), 594–604.
Rodriguez, L., Anconina, J., Flachskampf, F. A., Weyman, A. E., Levine, R. A., and Thomas, J. D. (1992). “Impact of finite orifice size on proximal flow convergence: Implicatons for Doppler quantification of valvular regurgitation.” Circ. Res., 70(5), 923–930.
Shammaa, Y., Zhu, D. Z., and Rajaratnam, N. (2005). “Flow upstream of orifices and sluice gates.” J. Hydraul. Eng., 131(2), 127–133.
Strelkoff, T., and Moayeri, M. S. (1970). “Pattern of potential flow in a free overfall.” J. Hydr. Div., 96(4), 879–901.
Utsunomiya, T., et al. (1991). “Dopper color flow ‘proximal isovelocity surface area’ method for estimating volume flow rate: Effects of orifice shape and machine factors.” J. Am. Coll. Cardiol., 17(5), 1103–1111.
Zarrati, A. R., Jin, Y. C., Shanehsaz-zadeh, A., and Ahadi, F. (2004). “Potential flow solution for a free surface flow past a sudden slope change.” Can. J. Civ. Eng., 31, 553–560.
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© 2008 ASCE.
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Received: Feb 1, 2007
Accepted: Jun 21, 2007
Published online: Jan 1, 2008
Published in print: Jan 2008
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