POSITIVE PRESSURE SUPER MICRO BUBBLE GENERATOR

The invention relates to a method of generating a layer of bubbles on a hull of a vessel comprising the steps of: -providing a cavity at the bottom of the vessel, having a length of at least 1 m and no longer than 30 % of the vessel length L along the bottom, preferably no longer than 25%, most preferably no longer than 10% of the vessel length L, and having a top surface spaced at least 50 cm away from the bottom plane, preferably at least 1 m away from the bottom plane, -providing air into the cavity via a compressor device at a pressure higher than atmospheric pressure to at least partially empty the cavity of water, -providing a water-air interface in the cavity for forming a mixing region, -generating a plurality of air bubbles in the mixing region, and -providing a bubble outlet at or near the rear of the cavity for allowing the bubbles to flow out along the hull towards the rear of the vessel.