# Acoustic resonances in microfluidic chips: full-image micro-PIV experiments and numerical simulations

## TL;DR

This paper demonstrates that combining full-image micro-PIV with transient particle imaging effectively studies acoustic forces and streaming in microfluidic chips, supported by experiments and numerical simulations of acoustic eigenmodes.

## Contribution

It introduces a comprehensive approach integrating micro-PIV and numerical modeling to analyze acoustic phenomena in microfluidic devices under MHz actuation.

## Key findings

- Steady-state particle motion aligns with acoustic eigenmodes.
- Numerical solutions confirm experimental observations.
- Effective method for studying acoustic resonances in microfluidics.

## Abstract

We show that full-image micro-PIV analysis in combination with images of transient particle motion is a powerful tool for experimental studies of acoustic radiation forces and acoustic streaming in microfluidic chambers under piezo-actuation in the MHz range. The measured steady-state motion of both large 5 um and small 1 um particles can be understood in terms of the acoustic eigenmodes or standing ultra-sound waves in the given experimental microsystems. This interpretation is supported by numerical solutions of the corresponding acoustic wave equation.