The Coanda effect with jet displacement over planar, concave, and convex walls
Baird, Leo James Michael
Hokenson, G. J.
Platzer, Max F.
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Borque and Herman presented an extensive paper analyzing the separate effects of deflection angle and offset distance on the reattachment of flow issuing from a two-dimensional incompressible turbulent jet to an adjacent inclined flat plate. Levin and Manion combined the effects of offset distance and vertical wall incidence and derived a set of metric equations to solve for the attachment distance at a given offset distance and deflection angle. Subsequently, Perry extended the control volume model to account for inaccuracies in defining a base pressure. As part of a general investigation of the Coanda effect, the work of Lavin and Manion has been expended herein to encompass concave and convex surfaces of arbitrary planform. Two methods are outlined for determining the attachment distance for these additional planforms. On the concave wall, agreement averaged within 20% of the experimental data for the range of spread parameters used, and agreement between the two methods as outlined for this surface averaged within 12%. The two methods agree within 10% on the convex wall, and agree within 15% and 12% respectively with the convex wall experimental data, in the range of spread parameter used. The planar wall data agree within an average of 12% of theoretical solutions. The hysteresis of flow attachment is viewed with particular attention focused on the intermediate region in which the flow divides and one portion attaches to the wall, while the remaining portion acts as if issuing from a free jet.
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