# Numerical Simulation of Acoustic Resonance and Streaming in Droplet Acoustofluidics

## TL;DR

This study uses numerical simulations to investigate how acoustic resonance weakens and streaming begins in droplet acoustofluidics, revealing the influence of phase properties on energy and streaming phenomena.

## Contribution

It introduces a numerical approach to analyze resonance weakening and streaming onset in droplet acoustofluidics based on phase property variations.

## Key findings

- Resonance weakening observed with increased wall oscillation amplitude.
- Streaming onset depends on relative acoustic properties of phases.
- Implications for acoustic focusing inside droplets.

## Abstract

This paper reports the phenomenon of resonance weakening and streaming onset in two phase acoustofluidics by performing numerical simulations of a capillary droplet suspended in a microfluidic chamber. The simulations show that depending on the relative acoustic properties of the two phases, it is possible to observe (i)~the decrease in the total acoustic energy as the oscillation amplitude at the wall increases, and (ii)~the onset of acoustic streaming. The impact of these findings in terms of acoustic focusing inside droplets is also discussed.