Piezoelectric Droplet Generator for the Calibration of Particle-Sizing Instruments

摘要

Using a piezoceramic tube and a continuous glass capillary,droplets in a diameter range between 10 #mu#m and 100 #mu#m can be generated. This corresponds to a volume of up to 0.6 pl. The velocity of the generated droplets depends on droplet size but is constant for each diameter. The liquid can be dosed assingle droplet, as an accumulation of droplets or as a chain of droplets in a frequency range between 1 Hzupto 3kHz. The lifetime of the droplets dependsondroplet size and the chemical and physical properties of the dispersed liquid. In addition, for water droplets the humidity of the air near the droplet trajectory influences the lifetime of the droplets.