Abstract: A method for producing and controlling an output flow from a convergent-divergent (C-D) nozzle from two or more pressurized flow streams of liquids, gases or other substances, the method having the steps of providing two or more pressurized flow streams as outputs from separate conduits or sources; positioning and arranging the output flow streams in a concentric manner; positioning and arranging the output flow streams and the entry end of a convergent-divergent (C-D) nozzle in a concentric manner; directing the flow streams into the entry end of the C-D nozzle; adjusting the location of one or more of the output flow streams relative to one another; adjusting the location of the entry end of the C-D nozzle relative to the output flow streams to control the flow from the exit end of the C-D nozzle from no atomization to full atomization. In addition, the method may include the step of adjusting the pressure and/or the flow rate of one or more of the pressurized flow streams.