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Mechanical Systems

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Related Experiment Video

Updated: May 8, 2026

Three-Dimensional Acoustic Assembly Device for Mass Manufacturing of Cell Spheroids

Three-Dimensional Acoustic Assembly Device for Mass Manufacturing of Cell Spheroids

Published on: October 13, 2023

Acoustic-driven self-rotating cylinders.

Ali Ashrafian¹, Milad Tehranifar², Majid Rajabi³

¹Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.

Scientific Reports

|May 6, 2026

Summary

This study presents ultrasound acoustic self-rotating cylinders, powered by acoustic field radiation. Specific surface velocity patterns enable non-zero torque for self-rotation without net motion.

Keywords:

Acoustic radiation torque Acoustic-driven swimmers Acoustophoresis, Micro-robotics

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Published on: December 2, 2011

Area of Science:

Acoustics
Fluid Dynamics
Mechanical Engineering

Background:

Acoustic radiation forces and torques are crucial in microfluidics and particle manipulation.
Understanding wave-solid-fluid interactions is key for designing novel acoustic devices.

Purpose of the Study:

To introduce and model ultrasound acoustic self-rotating cylinders.
To derive analytical expressions for acoustic radiation torque and force.
To propose design strategies for achieving self-rotation via controlled surface velocity patterns.

Main Methods:

Derivation of analytical expressions for acoustic radiation torque and force.
Mathematical modeling of self-excitation using normal velocity distributions on cylinder surfaces.
Numerical validation of proposed velocity distribution scenarios.
Estimation of frequency-dependent rotation velocity under low Reynolds number conditions.

Main Results:

Demonstration of non-zero acoustic radiation torque exertion on cylinders through specific normal velocity patterns.
Validation of wave-solid-fluid interactions leading to self-rotation with zero net motion.
Identification of feasible operating conditions and design parameters for self-rotating cylinders.

Conclusions:

Ultrasound acoustic self-rotating cylinders are feasible through precise control of surface acoustic fields.
The study provides a framework for designing and optimizing such acoustic devices.
This research opens possibilities for novel applications in micro-manipulation and propulsion.