Abstract: Nozzle apparatus and methods for producing a flow stream for ultrasonic testing are disclosed. In one embodiment, a nozzle assembly includes an outerbody and an innerbody disposed within the outerbody. The innerbody includes a first portion adapted to receive a fluid medium radially through a plurality of first baffle apertures into a first chamber, and a second portion adapted to provide a first passage for the fluid medium from the first chamber to a second chamber. The innerbody further includes a third portion adapted to receive the fluid medium radially through a plurality of second baffle apertures into a third chamber, and a fourth portion adapted to provide a second passage for the fluid medium from the third chamber to an exit aperture.