Related Experiment Video
Updated: Jun 29, 2025
13:02
Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
Published on: February 27, 2016
12.2K
High-speed and acceleration micrometric jets induced by GHz streaming: A numerical study with direct numerical
Virginie Daru1, Bjarne Vincent2,3, Michael Baudoin4,5
1DynFluid Lab, Arts & Métiers Science & Technology, 151 boulevard de l'hôpital, 75013, Paris, France.
The Journal of the Acoustical Society of America
|April 8, 2024
Summary
Gigahertz acoustic streaming generates high-speed microjets for precision micromanipulation. Higher frequencies significantly reduce time to reach maximum velocity, enabling Mega-g accelerations.
Area of Science:
- Fluid Dynamics
- Acoustics
- Microfluidics
Background:
- Gigahertz acoustic streaming offers potential for precision micromanipulation via high-speed microjets.
- Theoretical and numerical studies of high-frequency acoustic streaming are limited due to classical approach limitations and high computational costs.
Purpose of the Study:
- Investigate high-frequency bulk acoustic streaming.
- Characterize microjet speeds, scaling laws, and transient regimes at gigahertz frequencies.
Main Methods:
- Employed high-order finite difference direct numerical simulations.
- Analyzed acoustic streaming behavior at gigahertz frequencies.
Main Results:
- High-speed microjets (meters per second) are achievable at high frequencies due to diffraction limits.
- Maximum jet speed scales with frequency to the power of 3/2 (low attenuation) or linearly (high attenuation).
- Transient regimes show a power-law reduction (-5/2) in time to reach maximum velocity with increasing frequency, reaching microsecond timescales and Mega-g accelerations.
Conclusions:
- Gigahertz acoustic streaming is a viable method for generating high-speed microjets.
- The study provides scaling laws for jet speed and demonstrates significant reductions in acceleration time at higher frequencies.
