Reattachment of a Two-Dimensional, Incompressible Jet to an Adjacent Flat Plate

Abstract

SummaryAs part of a general investigation into Coanda effect, a study has been made of the reattachment of a two-dimensional, incompressible, turbulent jet to an adjacent, inclined, flat plate. The jet separates from the boundaries at the slot lips and reattaches to the plate downstream, a phenomenon which is associated with the lowering of the pressure between the jet and the plate accompanying the entrainment of fluid there. It is found that the flow becomes independent of both the length of the plate and the Reynolds number when these parameters are sufficiently large: the flow, scaled with respect to the width of the slot, is then uniquely determined by the plate inclination. Two approximate theories are developed for the mean pressure within the separation bubble, the position of reattachment and the increase in volume flow from the slot: the agreement with experiment is fairly satisfactory. These theories are a development of Dodds's analysis for the reattachment of a jet to a plate offset from, and parallel to, the axis of the slot and, for the purpose of comparison, a limited study is also made of this flow.

Scour Downstream of Grade‐Control Structures

“…Flow separates from the structure at point A' and a vortex is formed in the separation zone. With reduced pressure between points A' and C the jet deviates toward the boundary at an angle P' because of the Coanda effect discussed by Newman (1961), Bourque andNewman (1960), andRajaratnam andSubramanya (1968). The diffused flow velocity U b in the vicinity of B' exerts a shear stress on bed sediment particles.…”

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Theoretical and experimental study of a fluidic device as a fuel injector for natural gas engines

“…12. This assumption is based on the fact that the pressure inside the bubble is not constant and the attachment distance becomes infinite as the wall angle of the inclination approaches 678 (8). The jet attachment streamline path function can then be expressed as…”