Abstract: An impaction classifier is provided for generating submicron sized liquid droplets. A liquid spray of liquid droplets from a primary nebulizer is directed at an impaction device, producing droplets of smaller size. These smaller droplets are directed into a chamber and around a shroud where larger droplets are separated out. The smaller droplets then exit the chamber through one or more outlet ports.

Abstract: An ultrasonic piezoelectric aerosol submicron mist generator is disclosed having an interior cavity (15) containing at least two high-frequency, piezoelectric crystals (20). The piezoelectric crystals (20) are vibratible at a selected frequency to atomize a liquid (36) that has been distributed over the surface (22) of the crystals (20) via annular flow washers (40). The atomized liquid (36) forms a mist (42) thereafter received into a mixing chamber (44) wherein the mist (42) is entrained into a low pressure gas (46). The low pressure gas (46) transports the entrained mist (42) about a separator plate (50), whereby the mist (42) must change flow direction in order to exit a nozzle outlet (18) thus forcing droplets (52) larger than the desired size to separate from the low pressure gas (46) before reaching the nozzle outlet (18).

Abstract: An ultrasonic piezoelectric aerosol submicron mist generator is disclosed having a high-frequency, piezoelectric crystal (18) which is vibratible at a selected frequency to atomize a liquid (24) that has been evenly distributed over the crystal (18) via an annular flow control washer (28). The atomized liquid (24) forms a mist (20) thereafter received into a mixing chamber (30) wherein the mist (20) is entrained into a low pressure gas (36). The low pressure gas (36) transports the entrained mist (20) about a separator plate (32), whereby the mist (20) must change flow direction in order to exit a nozzle outlet (42) thus forcing droplets (40) larger than the desired size to separate from the low pressure gas (36) before reaching the nozzle outlet (42).