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Reverse flow in a channel with an obstruction at the entry

  • B. H. Lakshmana Gowda (a1) and E. G. Tulapurkara (a2)

Abstract

In this study the flow through and around a parallel-walled channel with an obstruction (flat plate) placed at the channel inlet is investigated. Depending on the position of the obstruction, the flow inside the channel is in a direction opposite to that outside, stagnant or in the same direction as outside but with reduced magnitude. Flow visualization in water is used to examine the fluid motion, although some wind tunnel measurements have been made and are also reported. The parameters that have been varied are the gap between the obstruction and the entry to the channel, the length of the channel and the Reynolds number. The maximum value of the reverse flow velocity is found to be about 20% of that of the flow outside. The maximum forward velocity inside the channel (when it occurs) is only about 65% of the outside velocity even for very large gaps between the obstruction and the channel entrance. A tentative explanation is offered for the observed features.

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Abernathy, F. H. & Kronauer, R. E., 1962 The formation of vortex streets. J. Fluid Mech. 13, 120.
Batchelor, G. K.: 1967 An Introduction to Fluid Dynamics. Cambridge University Press.
Chang, P. K.: 1970 Separation of Flow, p. 345. Pergamon.
Davis, C. G. & Sorenson, K. E., (eds) 1969 Handbook of Applied Hydraulics, pp. 3729 to 3737. McGraw-Hill.
Eom, K.: 1988 Performance of a butterfly valve as a flow controller. Trans. ASME I: J. Fluids Engng 110, 1619.
Gerrard, J. H.: 1966 The mechanics of the formation region of vortices behind bluff bodies. J. Fluid Mech. 25, 401413.
Gerrard, J. H.: 1978 The wakes of cylindrical bluff bodies at low Reynolds numbers. Phil. Trans. R. Soc. Lond. A 288, 351382.
Hutchison, J. W. (ed.). 1976 ISA Handbook of Control Valves.
Kiya, M. & Matsumara, M., 1988 Incoherent turbulence structure in the near wake of a normal plate. J. Fluid Mech. 190, 343356.
Perry, A. E. & Steiner, T. R., 1987 Large-scale vortex structure in turbulent wakes behind bluff bodies. J. Fluid Mech. 174, 233270.
Pierce, D.: 1961 Photographic evidence of the formation and growth of vorticity behind plates accelerated from rest in still air. J. Fluid Mech. 11, 460464.
Smits, A. J.: 1982 A visual study of separation bubble. In Proc. 2nd Intl. Symp. on Flow Visualisation, Bochum, Sept. 9–12, 1980 (ed. W. Merzkirch). Hemisphere.
Streeter, V. L. (ed.) 1961 Handbook of Fluid Dynamics, pp. 2129 to 2140. McGraw-Hill.
Tulapurkara, E. G., Gowda, B. H. Lakshmana & Balachandran, N. 1988 Laminar flow through slots. J. Fluid Mech. 190, 179200.
Unal, M. F. & Rockwell, D., 1988a On vortex formation from a cylinder. Part 1. The initial instability. J. Fluid Mech. 190, 491512.
Unal, M. F. & Rockwell, D., 1988b On vortex formation from a cylinder. Part 2. Control by splitter-plate interference. J. Fluid Mech. 190, 513529.
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Reverse flow in a channel with an obstruction at the entry

  • B. H. Lakshmana Gowda (a1) and E. G. Tulapurkara (a2)

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