关键词: 液体喷射;射流控制;超声波换能器;直流喷嘴

Abstract: A study on principle and characteristics of ultrasonic nozzle is carried out theoreticallyand experimentally. By use of computerized CCD videodisplay technology,the effects of piezoelectricparameter d33,exciting voltage A,injecting pressure p,injection orifice diameter d0,nozzle gap 6 andexciting frequency f on jet break-up and droplet formation are emphatically investigated. It is shownthat lower injecting pressure,smaller orifice diameter,and greater piezoelectric parameter will improvethe droplet formation and the operation stabilization of ultrasonic nozzle. It is also indicated that thereare optimum nozzle gap and exciting frequency for droplet formatiom. All of these conclusions areavailable to design the nozzle of the ink jet printer.

Key words: Liquid injection;Fluidic control;Ultrasonic transducer;Spray injector