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

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Acoustic streaming field structure. Part II. Examples that include boundary-driven flow.

Charles Bradley¹

¹Sangkat Boeung Kok II, Khan Tuol Kork, Phnom Penh, Cambodia.

The Journal of the Acoustical Society of America

|January 28, 2012

Summary

This study demonstrates a streaming model for acoustic streaming problems. It illustrates how boundary conditions can drive steady fluid flows, similar to Couette flow.

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Area of Science:

Fluid Dynamics
Acoustics
Acoustic Streaming

Background:

Acoustic streaming is a fluid flow generated by acoustic waves.
Previous models exist for acoustic streaming, but practical examples are needed.
Understanding boundary conditions is crucial for predicting flow behavior.

Purpose of the Study:

To demonstrate the application of Bradley's acoustic streaming model.
To illustrate features of streaming flows predicted by the general model.
To showcase cases with nontrivial lateral boundary conditions driving flow.

Main Methods:

Solving three simple acoustic streaming problems.
Applying a previously published streaming model.
Analyzing boundary conditions at the radiator face.

Main Results:

Demonstrated cases where boundary conditions induce lateral dc velocity components.
Illustrated the generation of steady solenoidal flow from specific boundary conditions.
Validated the model's ability to predict complex flow behaviors.

Conclusions:

The demonstrated model effectively simulates acoustic streaming.
Lateral boundary conditions play a significant role in driving steady fluid flows.
This work provides concrete examples for understanding acoustic streaming phenomena.