Acoustic levitation and its application in estimation of high power sound field

Kato

Osumi

2013

We experimentally verified the method of using the radiation force of high-intensity aerial ultrasonic waves at a frequency of 20 kHz to remove a liquid that entered a long pore. It was found that, on the wall surface of a cavity formed in the pore after the liquid had been removed by irradiating with ultrasonic waves, a small number of residual liquid drops linearly accumulated at multiple positions along the internal circumference of the cavity wall. The positions irregularly changed as the removal progressed. It can be considered that this phenomenon was mainly caused by the acoustic radiation force produced by nonlinear aerial ultrasonic waves. To explain this phenomenon, we observed in detail the behavior of the liquid; in addition, we performed a simulation of the acoustic radiation force produced by nonlinear aerial ultrasonic waves in a long pore, and compared the results of the simulation with the observed behavior of the liquid.

Section: Introductionmentioning

confidence: 99%

Examinations of Behavior of Liquid Irradiated with High-Intensity Aerial Ultrasonic Waves in a Long Pore

Kato

Osumi

2013

“…9) To solve these problems, we considered a method using the acoustic radiation force of aerial ultrasonic waves. [10][11][12][13][14] By using this method, a liquid that has entered a long pore with open ends can be forced out of the pore by irradiating highintensity ultrasonic waves. Because a strong air flow is not produced, this method has a very small effect on the area around the pore.…”

Section: Introductionmentioning

confidence: 99%

Removal of Liquid in a Long Pore Opened at Both Ends Using High-Intensity Aerial Ultrasonic Waves

Takamura

2010

We experimentally verified a method by which a liquid that has entered a long pore with open ends can be removed from the pore by using the acoustic radiation force produced by high-intensity aerial ultrasonic waves at a frequency of 20 kHz. The intensity of the ultrasonic waves was about 6 to 10 kPa. By using this method, it was confirmed that a liquid in pores of 1.5 to 5.0 mm diameter and 3 to 20 mm length could be instantaneously removed from the pores. This method, which did not use any air flow at a high pressure, has the significant advantage that it does not produce any strong air flow around the pore. We consider the intensity of the ultrasonic waves required to remove the liquid, the time required to remove the liquid, and the quantity of liquid removed, all of which were determined by varying the diameter and length of the pore.

“…It is considered that methods utilizing the sound acoustic radiation force of high-intensity aerial ultrasonic waves may be used to retain any small solid object [1][2][3][4][5][6][7] or liquid on the surface of an object within a specific long and narrow region in a noncontact manner. In this study, we used a linearly convergent aerial ultrasonic source that we developed.…”

Section: Introductionmentioning

confidence: 99%

Linearly Convergent Aerial Ultrasonic Source Providing a Variable Incident Angle and Acoustic Radiation Force by Standing-Wave Ultrasonic Field

2009