According to the invention a method (and corresponding system) of enhancing application of high intensity acoustic waves is provided, wherein acoustic waves, e.g. ultrasound, and a gaseous medium, e.g. steam, coincide at a treatment zone. This is achieved by a combination of one or more high intensity acoustic generators and/or reflectors. In this way, enhanced efficiency in an area of the gaseous medium (or where the gaseous medium is to affect something) is obtained since a second generator or a reflector is located so that the acoustic waves directly influence the gaseous medium.
