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Steady, Laminar Flow Between Parallel Plates

Steady, Laminar Flow Between Parallel Plates

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Related Experiment Video

Updated: Aug 16, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Continuous Particle Aggregation and Separation in Acoustofluidic Microchannels Driven by Standing Lamb Waves.

Jin-Chen Hsu¹, Chih-Yu Chang¹

¹Department of Mechanical Engineering, National Yunlin University of Science and Technology, Douliu 64002, Taiwan.

|December 23, 2022

Summary

This study demonstrates acoustic aggregation and separation of microparticles using standing Lamb waves on lithium niobate plates. The method utilizes acoustic radiation and drag forces for controlled particle manipulation in microfluidic channels.

Keywords:

Lamb wave acoustic aggregation acoustic separation acoustofluidics

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Last Updated: Aug 16, 2025

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Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles

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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

Area of Science:

Acoustofluidics
Microfluidics
Materials Science

Background:

Microparticle manipulation is crucial for various applications.
Existing methods often face limitations in precision and throughput.
Lithium niobate (LiNbO3) offers unique piezoelectric properties for acoustic wave generation.

Purpose of the Study:

To achieve acoustic aggregation and separation of microparticles in fluid channels.
To investigate the use of standing Lamb waves for microparticle manipulation.
To elucidate the underlying acoustic and fluid dynamics mechanisms.

Main Methods:

Excitation of counter-propagating Lamb modes using double interdigitated transducers on a LiNbO3 plate.
Utilizing interfacial coupling between the solid plate and fluid.
Employing finite-element simulations based on acoustic perturbation theory and full-wave modeling.
Conducting experimental validation of particle aggregation and separation.

Main Results:

Demonstrated controlled acoustophoretic motion of microparticles.
Identified strong acoustic streaming as the dominant factor in particle aggregation.
Showcased differential expulsion of particles by acoustic radiation force for size-based separation.
Validated the efficacy of the designed devices for particle manipulation.

Conclusions:

Standing Lamb waves on LiNbO3 plates enable effective microparticle aggregation and separation.
Acoustic streaming and radiation forces are key mechanisms for manipulation.
This work establishes a foundation for Lamb-wave acoustofluidics and innovative thin-plate platforms.