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Related Experiment Video

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

Stability analysis of an acoustically levitated disk.

Junhui Hu¹, Kentaro Nakamura, Sadayuki Ueha

¹School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore. ejhhu@ntu.edu.sg

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|March 11, 2003

Summary

This summary is machine-generated.

A new model analyzes acoustic levitation stability by examining eddy acoustic streaming and viscous stress. Key findings reveal optimal vibrator design and fluid properties are crucial for stable acoustic levitation.

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Area of Science:

Acoustics
Fluid Dynamics
Materials Science

Background:

Acoustic levitation offers contactless manipulation of objects.
Understanding stability is crucial for practical applications.

Purpose of the Study:

To develop a model for analyzing the stability of acoustically levitated disks.
To investigate factors influencing stability and provide design guidelines.

Main Methods:

Developed a model based on eddy acoustic streaming and acoustic viscous stress.
Accounted for acoustic streaming outside the boundary layer.
Limited calculations to dominant stability-influencing ranges.

Main Results:

Accurate stability coefficient solutions obtained.
Model verified by experimental and theoretical agreement for disk shifts.
Identified vibrator geometry (edge to outermost nodal circle distance) as critical for stability.
Fluid properties significantly impact stability; steam is more stable than air, CO2, and hydrogen.
Increased object weight per unit area enhances stability.

Conclusions:

A critical distance between the vibrator's edge and outermost nodal circle is necessary for stabilization.
Exceeding this critical distance can decrease stability.
Fluid selection and object density are key design parameters for stable acoustic levitation.