Abstract
An aerosol generator capable of generating a narrow size-distribution aerosol with high mass concentration was designed, fabricated, and tested. Gravity was used to settle out large particles and a virtual impactor with a clean air core was employed to remove small particles. Aerosols generated from a sodium chloride solution (0.05% to 9% by volume) were found to have a mass median aerodynamic diameter (MMAD) in the range from about 1 to 10 μm and a geometric standard deviation (GSD) varying from 1.18 to 1.46. Aerosol generation rate (Ma) varied from about 0.2–24 mg/ min depending upon the final particle size. The overall dimensions of this generator were about 190 cm in height and 15 cm in diameter. Droplet generation was performed with a Delavan simplex nozzle (#30609-5). The selected operating conditions were: atomization pressure ≃ 200 kPa and liquid pressure ≃ — 4 kPa (relative to the ambient pressure). At these operating conditions, the nebulizing air flow rate was 47 1pm and the liquid flow rate wa...
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