Measurements of the Size Distribution of Aerosols Produced by Ultrasonic Humidification
Open Access
- 1 January 1990
- journal article
- research article
- Published by Taylor & Francis in Aerosol Science and Technology
- Vol. 13 (2) , 220-229
- https://doi.org/10.1080/02786829008959440
Abstract
Aerosol number and mass distributions produced by an ultrasonic room humidifier and an ultrasonic medical nebulizer were examined in a limited-scale study. Rapid droplet drying occurred at room humidities and under near saturated conditions. A model was tested describing the diameter of dried particles as a function of the dissolved mineral content of the water and the transducer frequency. Water containing 102 mg/L of dissolved minerals in a humidifier with a 1.6 MHz transducer produced droplets with a mass median diameter of 2.9 μm. The number median diameter of particles after drying was computed to be 0.11 μm. The distribution of particles in a nebulizer tube using a NaCl solution was shown to consist of a mixture of dried salt particles and droplets which included coagulated multiplets.Keywords
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