A model of axisymmetric liquid outflow from large vessels is developed and is used to explain aspects of flow for self-venting and choked outlets. It is shown that for flows with self-venting outlets the model relates the liquid level to the flow. It is also shown that for flow with choked outlets the model gives a conservative estimate for the minimum liquid level required to prevent drawdown of the supernatant phase. The results obtained are also compared with the experimental and theoretical work of previous investigators.
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References
1.
SimpsonL. L.Sizing piping for process plants. Chem. Engr., 1968, 75(13), 192–214.
HarlemanD. R. F.MorganR. L.PurpleR.Selective withdrawal from a vertically stratified fluid. Int. Association for Hydraulic Research, 8th Congress, 1959, p.
4.
LubinB. T.SpringerG. S.The formation of a dip on the surface of a liquid draining from a tank. J. Fluid Mech., 1967, 29, 385–390.
5.
McDuffieN. G.Vortex free downflow in vertical drains. A. I. Ch. E. J., 1977, 23(1), 37–40.
6.
KalinskeA. A.Hydraulics of vertical drains and overflow pipes. University of Iowa Studies, 1940, Bulletin 26.
7.
GardnerG. C.CrowI. G.Onset of drawndown of supernatant fluid in surge tanks. Chem. Engng. Sci., 1971, 26, 211–219.
8.
KubieJ.OatesH. S.Aspects of outflow from large vessels. Trans. ASME J. Fluids Engng, 1980, 102, 324–329.
9.
RouseH.Abul-FetouhA.-H.Characteristics of irrotational flow through axially symmetric orifices. Trans. ASME J. Appl. Mech., 1950, 71, 421–425.
10.
HendersonF. M.Open channel flow Macmillan Series in Civil Engineering, Macmillan, London, 1966.
