the required pressure to achieve the appropriate flow velocity through slit 50 in order to effect attachment of the primary fluid to the curved surface an environmental or second fluid which may be enclosed by an outer chamber 60 will be entrained by the primary fluid which results in severe turbulence at the boundary layer a third fluid m introduced into the entrainment zone p shown in fig2 becomes a part of the system and is violently involved by the forces of entrainment if this introduced third fluid is a molten metal stream said stream is disintegrated into a spray which is discharged from the foil surface such metallic stream may be introduced into the entrainment zone p through holes slits or other orifice configurations 70 which permit this flow from a tundish 80 which holds the metal supply the tundish 80 may be configurated to fit the application deposition configuration and may be designed to dispense molten material in a straight line a circle or any other configuration which the application requires the finer the stream of metal flow the finer and more consistent the resulting droplet spray therefore the molten metal may be dispensed through holes of various diameters slots etc as with the tundish the coanda device 10 might be designed in a wide variety of configurations it may be straight line circular square irregular helical or any other configuration which satisfies the application the curved surface of the device may be a part of the device chamber or may be separated from the chamber if required to permit.