Aerosol number and mass distributions produced by an ultrasonic room humidifier and an ultrasonic medical nebulizer were examined in a limited-scalestudy. Rapid droplet drying occurred at room humidities and under near saturatedconditions. A model was tested describing the diameter of dried particles as a function of the dissolvedmineral content of the water and the transducer frequency. Water containing 102 mg/L of dissolved min-erals in a humidifier with a 1.6 MHz transducer produced droplets with a mass median diameter of 2.9 pm. The number median diameter of particles after drying was computed to be 0.11 pm. The distributionof parti. cles in a nebulizer tube using a NaCl solution was shown to consist of a mixture of dried salt particlesand droplets which included coagulated multiplets.
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