Surface wave patterns on acoustically levitated viscous liquid alloys

Here we demonstrate that spherical rotors with 40 mm diameter and 0-1 kg mass can be suspended more than tens of micrometers away from an ultrasonically vibrating concave surface by near-field acoustic radiation force. Their rotating speeds exceed 3000 rpm. An acoustic model has been developed to evaluate the near-field acoustic radiation force and the resonant frequencies of levitation system. This technique has potential application in developing acoustic gyroscope.

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Vortex-field acoustic levitation in tubes

Hong

Yin

Zhang

et al. 2020

Journal of Applied Physics

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Vortex-field acoustic levitation (VAL) is a versatile acoustic levitation method that allows simultaneous rotation and movement of the levitated object. However, the levitation capability of VAL in air was previously limited to the levitation of objects with a density equal to or less than that of water. Here, we generate first-order acoustic vortices using an annular array of sources and investigate the characteristics of VAL within a cylindrical tube. It is shown that the number of potential minima on the vortex axis and the levitation capability of VAL can be enhanced by careful choice of the geometry of the array and the tube. As an example, a stainless steel sphere (density about 7.9 g/cm3) and a copper sphere (density about 8.7 g/cm3) have been successfully levitated.

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Surface wave patterns on acoustically levitated viscous liquid alloys

Abstract: Surface tension of liquid ternary Fe-Cu-Mo alloys measured by electromagnetic levitation oscillating drop method

Cited by 5 publications

References 19 publications

Crystallization in Acoustically Levitated Drops

Crystallization in Acoustically Levitated Drops

The near-field acoustic levitation of high-mass rotors

Vortex-field acoustic levitation in tubes

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