The Influence of Surface Temperature on Coanda Effect

Coanda effect is the adhesion of fluid on a convex surface. This paper presents the effect of temperature on the Coanda flow and shows how the temperature of the surface can influence the flow behaviour. It has been found that there are two mechanisms which influence the flow behaviour; both have contrary effect on the flow. One is based on variable Prandtl number and another is based on constant Prandtl number (thermal diffusivity) effect. The increment of the thermal diffusivity has prolonged separation of the boundary layer, while other mechanism triggers the earlier detachment of the flow from the curved surface. The preliminary CFD evaluation has provided the important controlling parameter for the thrust deflection.