Design and simulation of a novel low-frequency ultrasonic atomizing nozzle based on focuzing ultrasinic levitation

摘要

The size of the nutrient solution droplet in the roots environment makes a big difference to the growth of aeroponic plants. In order to control the size of nutrient solution droplets around aeroponic plant roots and generante supper-fine droplets, the principle of low-frequency ultrasonic dual-atomization based on focusing ultrasonic levitation was put forward in this paper. The nozzle work frequency and work mode were calculated based on the nozzle three-dimentional finite element model. The dual-atomization process based on focusing ultrasonic levitation was studied by using the simulation of VOF method; A novel nozzle based on the principle of low-frequency ultrasonic dual-atomization was invented. The droplet size measurement of the nozzle atomization was carried out, too. After droplet images acquisition, the diameter of the droplets that under various experimental conditions was calculated approximatively by image processing. The image processing result shows that the size of the ultra-fine droplets can be adjusted, which verified the principle of low-frequency ultrasonic dual-atomization based on focusing ultrasonic levitation.