Study of atomization of a water jet by high-intensity aerial ultrasonic waves

An experimental study has been carried out on the atomization of a waterjet by aerially radiating it with high-intensity ultrasonic waves. A sound sou rce that enables the linear generation of high-intensity aerial ultrasonic waves (frequency: approximately 20 kHz) is combined with a cylindrical refl ection plate in order to create a standing-wave sound field. An attempt has been made to atomize a waterjet of I mm diameter by passing it through the above sound field at a velocity of approximately 30 m/s. It has been clari fied that nodes of sound pressure in the standing-wave sound field are effe ctive for the atomization of a water jet. In addition, the atomizing phenom enon of a water jet has been observed precisely, The relation between the i ntensity of sound waves required for atomization and the radiation duration has also been clarified. Even the radiation of sound waves for only 2 ms a tomizes water. This suggests that a very fast water jet at 300-500 m/s migh t be atomized.