Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2021
Date : September 13, 2021 - September 17, 2021
When particles placed in an acoustic tube are resonated using a speaker, the particles start to move and rise against gravity, forming a fold-like pattern. Since the interval and height of patterns change depending on experimental conditions such as the magnitude of sound pressure and resonance frequency, it is sometimes used in sound visualization demonstration experiments. However, although it has been studied since the discovery of this phenomenon, the mechanism of its occurrence has not been fully elucidated. This paper considers the acoustic radiation force acting on the sphere and the force acting on the particles in the acoustic tube proposed by L.V.King. In particular, using the actual specifications, after calculating the acoustic radiation force, the inclination of the thread that suspended the particles was calculated and compared with the experimental value. Furthermore, consider an experiment in which the tube was narrowed by clay in the middle of the acoustic tube. Finally, the acoustic radiation force was calculated based on King's theory, with the pattern in the middle as an obstacle.
