NOVELTY - A sonic device comprises sonic mechanism for applying a high intensity sound or ultrasound to the surface of an object. The high intensity sound or ultrasound is applied directly in the gas that is also the medium through which the high intensity sound or ultrasound propagates to the surface of the object, whereby a laminar sub-layer at the surface of the object is reduced and/or minimized.    USE - For enhancing a process involving a solid object, e.g. catalyst, and a gas, preferably for generating hydrogen using natural gas and steam (claimed).    ADVANTAGE - The reduction of the laminar sub-layer provides increased heat transfer efficiency, increased catalytic speed and/or increased gas exchange.    DETAILED DESCRIPTION - A sonic device for enhancing a process involving a solid object (100) and a gas (500) surrounding the object or at least in contact with a surface (204) of the object comprises sonic mechanism (301) for applying a high intensity sound or ultrasound to the surface of the object. The high intensity sound or ultrasound is applied directly in the gas that is also the medium through which the high intensity sound or ultrasound propagates to the surface of the object, whereby a laminar sub-layer at the surface of the object is reduced and/or minimized.    INDEPENDENT CLAIMS are also included for:    (1) a method of enhancing a process involving a solid object and a gas comprising applying a high intensity sound or ultrasound to at least the surface of the object by sonic mechanism, where the high intensity sound or ultrasound is applied directly in the gas that is also the medium through which the high intensity sound or ultrasound propagates to the surface of the object, whereby a laminar sub-layer at the surface of the object is reduced and/or minimized; and    (2) a nozzle comprising cooling channels in connection with a sonic device generating ultrasound during use that is distributed in the channels.    DESCRIPTION OF DRAWING(S) - The figure shows a high intensity sound or ultrasound-generating device.    Solid object (100)    Surface (204)    Sonic mechanism (301)    Opening (302)    Passage (303)    Cavity (304)    Outer part (305)    Inner part (306)    Ultrasound (307)    Tube or chamber (309)    Gas (500)