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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Mixing high-viscosity fluids via acoustically driven bubbles.

Sinem Orbay¹, Adem Ozcelik², James Lata²

¹Department of Biomedical Engineering, The Pennsylvania State University, University park, PA 16802, USA.

Journal of Micromechanics and Microengineering : Structures, Devices, and Systems

|October 8, 2019

Summary

This summary is machine-generated.

This study introduces an acoustofluidic micromixer for rapid, homogeneous mixing of viscous fluids like polyethylene glycol (PEG) solutions. The device utilizes acoustic fields to achieve efficient mixing in milliseconds.

Keywords:

Micromixing acoustofluidics high-viscosity fluid polyethylene glycol (PEG)

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

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Published on: August 27, 2013

Area of Science:

Microfluidics
Acoustofluidics
Biomedical Engineering

Background:

Mixing highly viscous fluids presents significant challenges in microfluidic devices.
Traditional methods often require long mixing times or complex designs.

Purpose of the Study:

To develop and evaluate an acoustofluidic micromixer for rapid and homogeneous mixing of highly viscous fluids.
To demonstrate the device's effectiveness using viscous polyethylene glycol (PEG) solutions.

Main Methods:

Co-injection of two high-viscosity PEG solutions into a polydimethylsiloxane (PDMS) microchannel.
Generation of an acoustic field using a piezoelectric transducer to excite nitrogen bubbles.
Analysis of mixing efficiency based on acoustic streaming, droplet ejection, and bubble eruption effects.

Main Results:

Achieved homogeneous mixing of PEG-700 solutions (viscosity ~106 times that of DI water) with a mixing index of ~0.93.
Demonstrated rapid mixing within 50 milliseconds.
The acoustofluidic micromixer proved to be compact, inexpensive, and easy to operate.

Conclusions:

The developed acoustofluidic micromixer offers an efficient solution for mixing highly viscous fluids.
The device's compact and cost-effective design makes it suitable for various microfluidic applications.
Acoustic field manipulation of bubbles is a viable strategy for enhancing mixing in microchannels.