A fluidic assembly comprising: a fluidic oscillator configured to operate on a pressurized liquid flowing through said oscillator to generate a liquid jet that flows from said oscillator and into a surrounding environment to form a spray of liquid droplets, said oscillator having a boundary surface having fabricated therein a channel in the form of a fluidic circuit which controls the distribution of said spray of liquid droplets and a floor; an enclosure having an interior (13, 46) and an exterior surface, wherein a portion of said interior surface (13, 46) is configured to be attached to said oscillator boundary surface so as to form with said channel an enclosed pathway through which said liquid may flow, and wherein a segment of said interior surface (13, 46) is configured so as to form an element of said fluidic circuit, wherein said enclosure is configured as a lid with said portion of said interior surface having an upstream and a downstream end, and forming a surface that includes a plurality of planar parts, said planar part proximate said downstream end being sloped with regard to said adjoining upstream part so as to yield a taper or slope angle in the range of 2 to 45 degrees, characterized by the floor of the oscillator has a taper angle less than that slope angle of the lid to increase the rate at which the spray thickens as it spreads downstream. a fluidic oscillator configured to operate on a pressurized liquid flowing through said oscillator to generate a liquid jet that flows from said oscillator and into a surrounding environment to form a spray of liquid droplets, said oscillator having a boundary surface having fabricated therein a channel in the form of a fluidic circuit which controls the distribution of said spray of liquid droplets and a floor; an enclosure having an interior (13, 46) and an exterior surface, wherein a portion of said interior surface (13, 46) is configured to be attached to said oscillator boundary surface so as to form with said channel an enclosed pathway through which said liquid may flow, and wherein a segment of said interior surface (13, 46) is configured so as to form an element of said fluidic circuit, wherein said enclosure is configured as a lid with said portion of said interior surface having an upstream and a downstream end, an enclosure having an interior (13, 46) and an exterior surface, wherein a portion of said interior surface (13, 46) is configured to be attached to said oscillator boundary surface so as to form with said channel an enclosed pathway through which said liquid may flow, and wherein a segment of said interior surface (13, 46) is configured so as to form an element of said fluidic circuit, wherein said enclosure is configured as a lid with said portion of said interior surface having an upstream and a downstream end, and forming a surface that includes a plurality of planar parts, said planar part proximate said downstream end being sloped with regard to said adjoining upstream part so as to yield a taper or slope angle in the range of 2 to 45 degrees, characterized by the floor of the oscillator has a taper angle less than that slope angle of the lid to increase the rate at which the spray thickens as it spreads downstream.