Acoustic manipulation dynamics of levitated particle with screw-shaped reflecting surface

Abstract

Existing single-axis acoustic levitation devices with an axisymmetric reflector can manipulate particles in a variety of ways. However, the mechanism by which particles are suspended in a single-axis acoustic levitator with a non-axisymmetric reflector remains poorly understood. This work addresses this issue by proposing a novel single-axis ultrasonic levitator design that includes a flat plane emitter and a screw-plane reflector. The node positions of the standing wave formed in this levitator were predicted by calculating the Gor’kov potential according to a numerical model. The analysis results demonstrate that the nodes were distributed off-axis and their positions varied in a spiral manner when changing the distance between the emitter and reflector. Corresponding experiments based on the proposed design were also conducted, and the results indicated that the distance changes between the emitter and reflector could induce some spiral trajectories of a polyethylene-foam particle placed in the ultrasonic field. Moreover, the trajectory of the suspended particle was found to distribute along a conical surface centered on the central axis of this device. This work provides a new approach for ultrasonic particle manipulation by changing the geometry of the reflector.

Effect of array arrangement on acoustic levitation performance

“…Additionally, unlike traditional Langevin horns, where adjusting the focus requires complex structures [25] and the inability to actively control the focus position when adjusting the inclination angle [16,17,26], array-type acoustic levitation devices offer greater flexibility. Phase modulation allows array-type devices to actively change the focus in the optimal operating region when the structure varies, especially when the array rotates (φ = ϕ for concave array and φ = ϕ/2 for planar array).…”

Extraordinary Solidification Mechanism of Liquid Alloys Under Acoustic Levitation State

“…[4][5][6][7][8] Space simulation research has turned out to be particularly important due to the high cost and limited opportunity of on-orbit space experiments.Acoustic levitation is an effective containerless processing method for simulating space environment. [9][10][11][12] The phenomenon of acoustic levitation was first observed by Kundt [13] in 1866. He found that sound waves in a resonance tube could levitate dust particles.…”

“…Acoustic levitation is an effective containerless processing method for simulating space environment. [9][10][11][12] The phenomenon of acoustic levitation was first observed by Kundt [13] in 1866. He found that sound waves in a resonance tube could levitate dust particles.…”