Suppression of acoustic streaming by the inhomogeneity-induced acoustic body force

Research output: Contribution to journalArticle

Abstract

Rayleigh streaming in a homogeneous fluid has been extensively studied, and plays an important role in the manipulation of particles in microscale acoustofluidics. In this work, the acoustic streaming is investigated in a glass-silicon microchannel as it evolves in fluids made inhomogeneous in density and compressibility (or speed of sound) by the addition of solute molecules. It is found that the streaming is greatly suppressed in the bulk, due to the competition between the boundary-induced streaming stress and the inhomogeneity-induced acoustic body force. The streaming rolls are initially confined to a narrow region close to the walls, then expand from the walls into the bulk as the inhomogeneity is smeared out by diffusion and advection, and finally the homogeneous state is reached. The efficient suppression of streaming enables manipulation of submicron particles using acoustophoresis.

Details

Authors
Organisations
External organisations
  • Technical University of Denmark
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Fluid Mechanics and Acoustics
Original languageEnglish
Article number045023
JournalProceedings of Meetings on Acoustics
Volume34
Issue number1
Publication statusPublished - 2018
Publication categoryResearch
Peer-reviewedYes
Event21st International Symposium on Nonlinear Acoustics, ISNA 2018 - Santa Fe, United States
Duration: 2018 Jul 92018 Jul 13